Chevrolet 10 Series 1970 User manual

SEC TIO N IN D E X
SECTION NAME
1 9 7 0
SERIES 10 through 60
CHEVROLET TRUCK
CHASSIS
SERVICE MANUAL
0GENERAL INFORMATION
AND LUBRICATION
1A HEATER AND
AIR CONDITIONING
IB BODY
2FRAME
3FRONT SUSPENSION
4-WHEEL DRIVE
4REAR SUSPENSION
AND DRIVELINE
.BRAKES
This manual includes procedures for maintenance and 6ENGINE
adjustments, minor service operations, and removal and
installation for components of Chevrolet Series 10 through
60 Trucks. rocedures involving disassembly and assem
bly of major components for these vehicles are contained
in the 1970 Chevrolet Overhaul Manual.
6K ENGINE COOLING
6M FUEL SYSTEM
The Section Index on this page enables the user to
quickly locate any desired section. At the beginning of
each section containing more than one major subject is a 6T EMISSION CONTROL
SYSTEMS
Table of Contents, which gives the page number on which
each major subject begins. An Index is placed at the be
ginning of each major subject within the section.
Summaries of Special Tools, when required, are found
at the end of major sections while specifications covering
vehicle components are presented at the rear of the
manual.
This manual should be kept in a handy place for ready
6Y ENGINE ELECTRICAL
7CLUTCH AND TRANSMISSION
OO
FUEL TANK AND
EXHAUST SYSTEM
reference. If properly used, it w ill enable the technician
to better serve the owners of Chevrolet built vehicles.
All information, illustrations and specifications con 9STEERING
tained in this literature are based on the latest product
information available at the time of publication approval.
The right is reserved to make changes at any time without
notice.
10 WHEELS AND TIRES
11 CHASSIS SHEET METAL
12 ELECTRICAL— BODY
AND CHASSIS
• • • 13 RADIATOR AND GRILLE
CH EVRO LET M O T O R D IV IS IO N
G en eral M otors Corporation
DETROIT, M IC H IG A N 14 BUMPERS
1 ACCESSORIES
SPECIFICATIONS
© 1969
General Motors Corporation Printed in U.S.A.

SECTION 0
GENERAL INFORMATION
AND LUBRICATION
GENERAL INFORMATION
INDEX
age age
Model Line Up ....................................
Truck Series and Model Identification
Vehicle Identification Number and
Rating la te ..........................................
Engine N um ber....................................
Unit and Serial Number Locations . .
0-1 Service arts Identification late ................................. .. ..... 0-3
0-1 Keys and Lock s .................................................................................... ........ 0-3
ushing to Start Vehicle ..................................................................... ........ 0-3
0-2 Towing .................................................................................................. ........ 0-3
0-2 Load Capacity C h art............................................................................ ........ 0-3
0-2 Engine—Vehicle A vaila bility .............................................................. ........ 0-3
MODEL LINE UP
The 10 through 60 Series truck model line-up for 1970
consists of the models shown in the following chart:
Series 10 20 30 40 50 60 Total
Light Duty 40 36 37 113
Med. Duty 19 61 80
H. D. Conv. 27 27
H. D. Tilt 66
Fwd. Control 16 824
Total 56 44 37 19 61 33 250
TRUCK SERIES AND MODEL IDENTIFICATION
A five digit number preceded by two letters is used to
identify truck series and models. For example, vehicle
CS 10704 would be: Conventional [c], L-6 gasoline en
gine [S], 3600#-5600# GVW [T], 42” -47” Cab-to-Axle
dimension > Stepside pickup [04| , as listed below.
First Letter—Chassis
[c] - Conventional (Conventional Cab, anel, Suburban)
K - Four-Wheel Drive
M - Tandem (Conventional Cab)
- Forward Control
S - School Bus
T - Conventional (Tilt-Cab)
Second Letter—Engine
A - All
D - L-4 Diesel
E - V-8 Gasoline
G - V-6 Diesel (GMC Truck)
M - V-6 Gasoline
[S] - L-6 Gasoline
T - L-3 Diesel
V - V-6 Diesel (Detroit Diesel)
First Number—GVW Range
0 - All
[I] - 3600-5600#
2 - 5500-8100#
3 - 6700-10000#
4 - 10000-20000#
5 - 15000-23000# (single axle)
24000-30000# tandem axle)
6 - 15000-26000# (single axle)
30000-45000# (tandem axle)
Second and Third Numbers—
Cab-To-Axle Dimension
00 - All 17 - 102-107”
05 - X 18 - 108-113”
£3 - 42-47” 19 - 114-119”
09 - 54-59” 20 - 120-125”
10 - 60-65” 21 - 126-131”
12 - 72-77” 22 - 132-137”
13 - 78-83” 23 - 138-143”
14 - 84-89” 25 - 150-155”
15 - 90-95” 28 - 168-173”
16 - 96-101” 31 - 186-191”
Fourth and Fifth Numbers—
Body and Brake*
(* - Hydraulic unless otherwise specified.
00 - All
02 - Flat Face Cowl
03 - Cab
- Stepside ickup
05 - anel
06 - Suburban ( anel Rear Doors)
09 - Cab, latform, and Stake Rack
13 - Cab (full air brakes)
14 - Utility
16 - Suburban (Tail and Liftgate)
26 - Custom Suburban ( anel Rear Doors)
34 - Fleetside ickup
35 - Forward Control anel (Square-Front)
36 - Deluxe Suburban ( anel Rear Doors)
42 - Forward Control Chassis
55 - Forward Control (Aluminum Body)
62 - Flat Face Cowl (full air brakes)
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-2
VEHICLE IDENTIFICATION NUMBER AND
RATING PLATE
A combination vehicle identification number and rating
plate used on all models (fig. 1) is located on the left
door hinge pillar of Conventional, Tilt Cab and Forward
Control models, on the upper left hand side of dash
panel on Cowl models and on the steering column of
Forward Control models. Also, included on the plate
is a space (DD) for indicating the date the truck was
delivered to the customer.
A typical vehicle identification number will decode
as follows:
CS140 800025 (See Series and Model Identification).
CS14 Series and model identification, without
second, third and fourth numbers.
0 Last number of model year 1970.
Assembly plant, = ontiac.
100025 Twenty fifth vehicle built at that plant.
Unit numbering starts at 100001 at all
plants.
ENGINE NUMBER
The engine number indicates manufacturing plant,
month and day of manufacture, and transmission type. A
typical engine number would be F1210FA, which would
breakdown thus:
F - Manufacturing lant (F-Flint, T-Tonawanda)
12 - Month of manufacture (December)
r\ CHEVROLET MOTOR DIVISION
^ GENERAL MOTORS CORPORATION o
WARRANTY MAY BE VOIDED IF WEIGHT
EXCEEDS ANY OF THE RATINGS SHOWN
GROSS VEHICLE WEIGHT INCLUDES WEIGHT OF
BASE TRUCK, ALL ADDED EQUIPMENT, DRIVER
AND PASSENGERS, AND ALL PROPERTY LOADED
INTO TRUCK.
PREFER TO OWNER’S MANUAL FOR EQUIP
MENT REQUIRED FOR INTERMEDIATE OR
MAXIMUM GVW RATINGS, AND FOR OTHER
LOADING INFORMATION, INCLUDING TIRE
INFLATION.
RATING IN POUNDS
AS M A N U - * MAXIMUM
FACTURED CAPABILITY
GROSS VEHICLE WEIGHT
FOR THIS VEHICLE
MAXIMUM FRONT END
WEIGHT AT GROUND
MAXIMUM REAR END
WEIGHT AT GROUND
VEHICLE IDENTIFICATION NO.
OO
Fig. 1—V ehi le Identifi atio n Number and Rating
Plate Information
10 - Day of manufacture (tenth)
FA - Transmission and engine type
UNIT AND SERIAL NUMBER LOCATIONS
For the convenience of service technicians and engi
neers when writing up certain business papers such as
Warranty Reports, roduct Information Reports, or re
porting product failures in any way, the location of the
various unit numbers have been indicated. These unit
numbers and their prefix or suffix are necessary on these
papers for various reasons - such as accounting, follow-
up on production, etc.
The prefixes on certain units identify the plant in
which the unit was manufactured and thereby permits
proper follow-up of the plant involved to get corrections
made when necessary.
Always include the prefix in the number.
Axles
• Rear Axle Serial Number Located at the Bottom
Flange of Carrier Housing.
• Rear Axle (Except Half Ton) Forward Upper Surface
of Carrier.
• 2-Speed Axle Serial Number on Face of C arrier.
Tandem A xle, Forw ard Unit— Unit and Assem bly
Numvers Stamped on Left Side of C arrier.
• Tandem Axle, Rear Unit—Unit and Assembly Num
bers Stamped on Upper ortion of Carrier.
Transmissions
• 3-Speed Transmission Unit Number Located on
Lower Left Side of Case Adjacent to Rear of Cover.
• 4-Speed Transmission Unit Number Stamped on
Rear of Case, Above Output.
• New rocess 5-Speed Unit Number Stamped on
Rear Face of Case to Left of Drain lug. Spicer
3000 Series above lug. Spicer 5000 Series on
Nameplate Left Side of Case at Rear.
• 5-Speed Clark Transmission Unit Number Stamped
on Left Rear of Case, Near .T.O. late.
• 4-Speed Auxiliary Transmission Unit Number on
Left Side of Case.
• Allison Transmission art Number and roduction
Date on Tag Left Side of Case.
• owerglide and Turbo Hydra-Matic 350 Transmis
sion Unit Number Located on Right Rear Vertical
Surface of Oil an.
• The Turbo Hydra-Matic Transmission 400 Serial
Number is Located on the Light Blue late on the
Right Side of the Transmission.
Engines
• 6-Cylinder Engine Unit Number Located on ad at
Right Hand Side of Cylinder Block at Rear of
Distributor.
• 8-Cylinder Engine Unit Number Located on ad at
Front, Right Hand Side of Cylinder Block.
• Diesel Engine (Four Cycle) Serial Number Forward
of Right Cylinder Head on Cylinder Block.
• Diesel Engine Serial Number 6-Cylinder Forward of
Right Cylinder Head, 3, 4-Cylinder Rear Right of
Cylinder Head.
Delcotrons
Delcotron Unit Serial Number--Top of Rear Housing.
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-3
Batteries
Battery Code Number Located on Cell Cover Top of
Battery.
Starters
Starter Serial Number and roduction Date Stamped
on Outer Case, Toward Rear.
SERVICE PARTS IDENTIFICATION PLATE
The Chevrolet Truck Service arts Identification late
(fig. 2) is provided on all Truck models. On most series
it will be located on the inside of the glove box door, or,
on Forward Control series, it will be located on an inner
body panel. The plate lists the vehicle serial number,
wheelbase, and all roduction options or Special Equip
ment on the vehicle when it was shipped from the factory
including paint information. ALWAYS REFER TO THIS
INFORMATION WHEN ORDERING ARTS.
Fig. 2—Servi e Parts Identifi atio n Plate
KEYS AND LOCKS
Two keys are provided with each vehicle. The keys
operate the ignition switch and door locks.
PUSHING, TO START VEHICLE
NOTE: Towing to start is not recommended due
to the possibility of the disabled truck accelerat
ing into the towed vehicle.
Push Starts—Trucks Equipped with 3-Speed or
4-Speed Transmission
When a push start is necessary turn off all electrical
loads such as heater, radio and, if possible, lights, turn
on key, depress the clutch, and place the shift lever in
3rd gear. Release the clutch when your speed reaches
10 to 15 miles per hour.
Push Starts—Trucks Equipped with
Automatic Transmission
Do not attempt to start the engine by pushing the truck.
Should the battery become discharged, it will be neces
sary to use an auxiliary battery with jumper cables to
start the engine.
CAUTION: To prevent damage to electrical
system never connect booster batteries in ex
cess of 12 volts and connect positive to positive
and negative to negative.
TOW ING
All Except Four Wheel Drive Trucks
Normally your vehicle may be towed with all four
wheels on the ground for distances up to 50 miles at
speeds of less than 35 M H. The engine should be off
and the transmission in neutral.
However, the rear wheels must be raised off the ground
or the drive shaft disconnected when the transmission is
not operating properly or when a speed of 35 M H or dis
tance of 50 miles will be exceeded.
CAUTION: If a truck is towed on its front
wheels only, the steering wheel must be secured
with the wheels in a straight ahead position.
Four Wheel Drive Trucks
It is recommended that the truck be towed with the
front wheels off the ground. The truck can be towed,
however, with the rear wheels off the ground if there is
damage in the rear wheel area. In this event, the trans
mission selector lever should be placed in the “ N”
(neutral) position and the front drive disengaged. Towing
speeds should not exceed 35 M H for distances up to 50
miles. If truck is towed on its front wheels, the steering
wheel should be secured to keep the front wheels in a
straight-ahead position.
When towing the vehicle at slow speeds (approx. 20
M H), for a very short distance only, the transmission
must be in NEUTRAL and the transfer case MUST be in
“ TWO WHEEL HIGH.”
When towing the vehicle at faster speeds for greater
distances, the following steps MUST be taken:
• If front wheels are on the road, disconnect the front
drive shaft.
• If rear wheels are on the road, disconnect the rear
drive shaft.
Both 3 and 4 speed transmissions should be towed in
neutral only, with parking brakes fully released.
When towing a vehicle on its front wheels only, the
steering wheel should be secured to maintain a straight
forward position.
LOAD CAPACITY CHART
New spring capacities and mandatory equipment options
are included in the Load capacity chart on the following
pages.
ENGINE-VEHICLE AVAILABILITY
See chart below:
SERVICE PARTS IDENTIFICATION _________
w/baseH B H H
V.I.N. — VEHICLE IDENTIFICATION NUMBED
NO TE: THE S ECIAL EQUI M ENT LISTED BELO W HAS BEEN INSTALLED ON
TH IS VE H IC LE. FO R R O E R ID EN T IFIC A TIO N OF RE L A C EM EN T
A R TS BE SURE TO S ECIFY THE A LICAB L E O TIO N NUMBERS.
D E S C R I T IO N D E SC R I T IO N
IMPORTANT: RETAIN THIS PLATE AS A PERMANENT RECORD
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-4
ENGINE—VEHICLE AVAILABILITY
Engine
Description Appl. Series
Availability Fuel System Comp. Ratio
Emission
Control ower Rating
Gross
Displ. Type Evap. Exhaust H -R M TQ-R M
250 L-6
Gas Std. CS-KS- S10 1-Bbl.
Carb. 8:50:1 R O NA9 CCS TCS 155 @ 4200 235 @ 1600
CS-KS- S20;
CS- S30 -CCS
292 L-6
Gas R O L25 CS-KS10
(ex Utility) 1-Bbl.
Carb. 8.00:1 R O NA9 CCS TCS 170 @ 4000 275 @ 1600
CS-KS- S20;
CS- S30 CCS
307 V-8
Gas Std. CE-KE10 2-Bbl.
Carb. 9.00:1 R O NA9 CCS
TCS 200 @ 4600 300 @ 2400
CE-KE- E20;
CE- E30 AIR
350 V-8
Gas R O LS9 CE-KE10 4-Bbl.
Carb. 9.00:1 R O NA9 CCS TCS 255 @ 4600 355 @ 3000
CE-KE- E20;
CE- E30 CCS
400 V-8
Gas R O L47 CE10 (ex. Utility) 4-Bbl.
Carb. 9.00:1 R O NA9 CCS
TCS 310 @ 4800 400 @ 3200
CE20-30 -CCS
159 L-3
Diesel
(3-53N)
Std. T30 N40
Inject. 21.00:1 82 @ 2500 193 @
1500
250 L-6
Gas Std. CS- S-SS40 1-Bbl.
Carb. 8.50:1 -CCS 155 @
4200 235 @ 1600
292 L-6
Gas Std. CS-SS-TS50 1-Bbl.
Carb. 8.00:1 CCS 170 @
4000 275 @
1600
R O L25 CS- S-SS40
350 V-8
Gas Std. CE40;
CE-ME-SE-TE50 2-Bbl.
Carb. 8.00:1 -AIR 215 @
4000 335 © 2800
366 V-8
Gas R O L86 CE-ME-SE-TE50 4-Bbl.
Carb. 8.00:1 -AIR 235 @
4000 345 @ 2600
212 L-4
Diesel
(4-53N)
Std. CD50 N45
Inject. 21.00:1 130 @
2800 278 @ 1800
478 V-6
Diesel
(DH478)
Std. CG50 Dist. 17.50:1 165 @
2800 337 @ 2000
366 V-8
Gas Std. CE-ME60 4-Bbl.
Carb. 8.00:1 -AIR 235 @ 4000 345 @
2600
427 V-8
Gas R O L43 CE-ME60(ex. 02) 4-Bbl.
Carb. 8.00:1 -AIR 260 @
4000 405 @
2600
366 V-8
Gas Std. TE60 4-Bbl.
Carb. 8.00:1 -AIR 235 @
4000 345 @ 2600
CCS—Controlled Combustion System; TCS—Transmission-Controlled Spark (System); AIR—Air Induction Reactor (System)
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-
LOAD CAPACITY CHART INTERPRETATION
The first column of the Load Capacity Chart on the
following pages shows the basic model series.
The next column reflects the wheelbases available
within each series.
The third column shows the Gross Vehicle Weight
(GVW) Ratings applicable to each series truck. GVW
means the maximum design weight of the truck including
the truck itself and all equipment added to the truck
after it has left the factory, the driver weight and occu
pant weight and everything that is loaded into or onto the
truck.
Load Capacity Charts covering medium and heavy duty
models include the Gross Combination Weight (GCW)
ratings available for each series, following the GVW
column. The GCW is the total weight of a tractor, sem i
trailer and/or trailers including payload, fuel, driver,
etc.
Alphabetical codes also shown in the "M odels” , Wheel
base” , "GVW ” and "GCW” columns denote other mini
mum equipment requirements for certain GVW-GCW
ratings. Careful attention should be given to these codes,
to ensure that vehicles are properly equipped for any
given rating.
Following the GVW-GCW columns are the minimum
recommended tires to qualify the vehicle for each GVW-
GCW rating.
The letters "B .E .” under the Front and Rear Axle
and Spring columns indicate that base equipment is
satisfactory to qualify the vehicle for any given GVW-
GCW rating. When the letters "R O ” denoting Regular
roduction Option, followed by a number appears in
these columns (example R O F48), the consumer must
order the required extra cost equipment through the R O
specified.
The ratings shown under the column identified "M axi
mum Front End Weight At Ground” , "Maximum Rear End
Weight At Ground” , indicates the maximum permissible
loading or weight at the ground regardless of spring or
axle capacity ratings. These ratings are developed on the
basis of the minimum component capability be it axles,
springs or tires.
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-6
LOAD CAPACITY CHART FOR 1970 CHEVROLET SERIES TRUCKS
GASOLINE
MODELS WHEEL
BASE GVW
(POUNDS) *
RECOMMENDED
MINIMUM TIRES
MINIMUM MANDATORY EQUIPMENT FOR GVW RATING
FRONT
SPRINGS
MAXIMUM
FRONT END
WEIGHT AT
GROUND * REAR
AXLE REAR SPRINGS
MAXIMUM
REAR END
WEIGHT AT
GROUND *
FRONT REAR FRONT
AXLE
13380, 13 80
13480,13680 116 4100 G78-14B G78-14B BE. B.E. 1900 B.E. B.E. 2200
CS CE10
(03, 04, 34-Models) 11
127 4400 G78-1 B G78-1 B B.E. B.E. 2 00 B.E. B.E. 2 00 000 G78-1 B G78-1 B B.E. B.E. 2 00 B.E. RPOG 0 2948
CSCE 10
(0 , 06, 16 Models) 127 4400 G78-1 B G78-1 B B.E. B.E. 2 00 B.E. B.E. 2 00
400 H78-1 B H78-1 B B.E. RPO F60 2 00 B.E. RPOG 0 3221
CS-CE10
(14 Models) 104 4400 E78-1 B E78-1 B B.E. B.E. 2 00 B.E. B.E. 2 00
000 H78-1 B H78-1 B B.E. B.E. 2 00 B.E. RPO G 0 3221
CSCE 20
(exc. 21034 Models) 127 6200 8.7 -16. -6 8.7 -16. -6 B.E. B.E. 2700 B.E. B.E. 3980
6700 8.7 -16. -6 8.7 -16. -8 B.E. B.E. 2700 B.E. RPO G 0 4700
7 00 9. 0-16. -8 9. 0-16. -8 B.E. B.E. 2700 B.E. RPOG 0 200
CS-CE21034 133 6200 8.7 -16. -6 8.7 -16. -6 B.E. B.E. 2700 B.E. B.E. 3980
6700 8.7 -16. -6 8.7 -16. -8 B.E. B.E. 2700 B.E. RPO G 0 4700
7 00 9. 0-16. -8 9. 0-16. 8 B.E. B.E. 2700 B.E. RPOG 0 200
CS-CE30
(02, 03, 04, 34 Models)
(Single Rear Wheels)
133
1 7
6600 8.7 -16. -6 8.7 -16. -6 B.E. B.E. 3000 B.E. B.E. 3980
7800 9. 0-16. -8 9. 0-16. -8 B.E. B.E. 3000 B.E. RPOG 0 60
9000 9. 0-16. -10 9. 0-16. -10 B.E. B.E. 3000 B.E. RPOG6O6340
CSCE30
(02, 03 Models)
(Dual Rear Wheels)
133
1 7
9000 7.00-16-6 7.00-16-6
Dual B.E. B.E. 3 00 B.E. RPO G60 6320
10000 7. 0 16-6 7. 0-16-6
Dual B.E. RPO F60 3 00 B.E. RPOG6O 7260
CSCE 30
(02, 03 Models)
(Heavy Duty with Dual
Rear Wheels)
133
1 7
11000 7.00-18-8 7.00-18-8
Dual RPO H22 RPO H22 4000 RPO H22 RPO H22 9080
14000 8 19. -8 8-19. -10
Dual RPO H22 RPO H22 4000 RPO H22 RPO H22 11000
GS-GE10 90
108
3900 6.9 -14 4 6.9 -14-4 B.E. B.E. 2200 B.E. B.E. 1900
4 00 7.3 -14 8 7.3 -14-8 B.E. B.E. 2200 B.E. RPO G 0 2400
000 7.00-14-8 7.00-14-8 B.E. RPO F60 2200 RPO H04,
H0 RPO G 0 2900
GS-GE20 108 200 7.7 -1 -8 7.7 -1 -8 B.E. B.E. 2 0 B.E. B.E. 30 0
800 8.2 -1 -8 8.2 1 8 B.E. RPO F60 27 0 B.E. RPOG 0 3330
6200 8-16. -6 8-16. -6 B.E. RPO F60 27 0 B.E. RPOGSO 3460
KS-KE10
(03, 04, 34 Models) 11
127 200 G78-1 B G78-1 B B.E. B.E. 2900 B.E. B.E. 2948
600 H78-1 B H78-1 B B.E. B.E. 2900 B.E. B.E. 3221
KS-KE10
(06, 16 Models) 127 200 G78-1 B G78-1 B B.E. B.E. 2900 B.E. B.E. 2948
800 H78-1 B H78-1 B B.E. B.E. 2900 B.E. B.E. 3221
KS-KE10
(14 Models) 104 4600 E78-1 B E78-1 B B.E. B.E. 2 48 B.E. B.E. 2 48
000 G78-1 B G78-1 B B.E. B.E. 2948 B.E. B.E. 2948
KS-KE20 127 6400 8.7 -16. -6 8.7 -16. -6 B.E. B.E. 3200 B.E, BE. 3800
7200 8.7 -16. -6 8.7 -16. 8 B.E. B.E. 3200 B.E. RPO G 0 4700
7 00 9. 0-16. -8 9. 0-16. -8 B.E. B.E. 3200 B.E. RPO G 0 000
PS10 102 4600 G78-1 B G78-1 B B.E. B.E. 2 00 B.E. B.E. 2 00
300 H78-1 B H78-1 B B.E. B.E. 2 00 B.E. RPOGSO 3112
400 7.00-1 -6 7.00-1 -6 B.E. B.E. 2 00 B.E. RPO G 0 3440
PS-PE 20 12
133 6 00 8.7 -16. -6 8.7 16. -6 B.E. B.E. 3000 B.E. B.E. 3980
7 00 9. 0-16. -8 9. 0-16. -8 B.E. B.E. 3000 B.E. RPO G 0 200
PS-PE 30
(Single or Dual
Rear Wheels)
12
133
1 7
7300 8.7 -16. -6 8.7 -16. -8 B.E. B.E. 3140 B.E. B.E. 4700
10000 7. 0-16-6 7. 0-16-6
Dual B.E. B.E. 3240 B.E. RPO G60 7200
PS-PE30
(Heavy Duty with
Dual Rear Wheels)
12 11000 7.00-18 8 7.00-18-8
Dual RPO H22 RPO H22 3900 RPO H22 RPO H22 9080
1 7 14000 8-19. -8 8-19. -10
Dual RPO H22 RPO H22 4000 RPO H22 RPO H22 11000
PT30
(Diesel)
12 7700 8.7 -16. -6 8.7 -16. -8 B.E. B.E. 3140 B.E. B.E. 4700
133
1 7 10000 7. 0-16-6 7. 0-16-6
Dual B.E. B.E. 3240 B.E. RPO G60 7200
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-7
GASOLINE
MODELS WHEEL
BASE GVW
(POUNDS) * GCW (POUNDS)
RECOMMENDED
MINIMUM TIRES
MINIMUM MANDATORY EQUIPMENT FOR GVW OR GCW RATING
FRONT
AXLE FRONT
SPRINGS
MAXIMUM
FRONT END
WEIGHT AT
GROUND * REAR AXLE REAR SPRINGS
MAXIMUM
REAR END
WEIGHT AT
GROUND *
FRONT REAR
(DUAL)
CS-CE40
12
137
149
167
13 00 _7.00-20-8 7.00-20-8 8.E. B.E. 4000 B.E. B.E. 9800
1 000 a -7.00-20-8 7. 0-20-8 B.E. RPO F60 000 B.E. B.E. 11000
16000 a -7.00-20-8 7. 0-20-8 B.E. RPO F60 000 RPO H07 RPO H07 11000
18000 a -7. 0-20-8 8.2 -20-10 B.E. RPO F60 000 RPO H07 RPO G 13 00
PS40 1 7
17
13 00 —7.00-20-8 7.00-20-8 B.E. B.E. 4000 B.E. B.E. 9800
1 000 a -7.00-20-8 7. 0-20-8 B.E. RPO F60 000 B.E. B.E. 11000
16000 a -7.00-20-8 7. 0-20-8 B.E. RPO F60 000 RPO H07 RPO H07 11000
18000 a —7. 0-20-8 8.2 -20-10 B.E. RPO F60 000 RPO H07 RPOG 13 00
SS40 149
13 00 -7.00-20-8 7.00-20-8 B.E. B.E. 4000 B.E. B.E. 9800
1 000 -7.00-20-8 7. 0-20-8 B.E. RPO F60 00 B.E. B.E. 11000
16000 - 7.00-20-8 7. 0-20-8 B.E. RPO F60 00 RPO H07 RPO H07 11000
18000 -7. 0-20-8 8.2 -20-10 B.E. RPO F60 00 RPO H07 RPO G 13 00
SS-SE 20
SS-SE 2
SS-SE 28
SSSE 28
189
218
23
23
16000 _7. 0-20-8 7. 0-20-8 B.E. B.E. 00 B.E. B.E. 11000
19 00 - 8.2 -20-10 9.00-20-10 B.E. B.E. 00 B.E. RPO G 1 000
22000 -8.2 -20-10 9.00-20-10 RPO F48 RPO F48 7000 B.E. RPOG 6 1 000
24000 -8.2 -20-10 9.00-20-12 RPO F48 RPO F48 7000 RPO H16 RPOG 6 17000
SE 31 2 4
16000 -7. 0-20-8 7. 0-20-8 B.E. B.E. 6280 B.E. B.E. 11000
18000 -8.2 -20-10 8.2 -20-10 B.E. B.E. 7000 B.E. RPOG 14200
19 00 -8.2 -20-10 9.00-20-10 B.E. B.E. 7000 B.E. RPO G 1 000
22000 -8.2 -20-10 9.00-20-10 B.E. B.E. 7000 B.E. RPOG 6 1 000
24000 -8.2 -20-10 9.00-20-12 B.E. B.E. 7000 RPO H16 RPOG 6 17000
CS-CE 0
12
137
149
167
173
179
189
203
218
1 000 32000 7. 0-20-8 7. 0-20-8 B.E. B.E. 000 B.E. B.E. 11000
19 00 32000 8.2 -20-10 9.00-20-10 B.E. B.E. 000 B.E. RPOG 1 000
22000 b 32000 8.2 -20-10 9.00-20-10 RPO F48 RPO F48 7000 B.E. RPOG 6 1 000
24000 b 4 000
(CE only) 8.2 -20-10 9.00-20-12 RPO F48 RPO F48 7000 RPO J71,
J11 or J12 RPOG 6 17000
TS-TE 0
Hydraulic
Brakes
133
14
17
17000 3 000 7. 0-20-8 7. 0-20-8 B.E. B.E. 6280 B.E. B.E. 11000
18000 3 000 7. 0-20-8 7. 0-20-10 B.E. B.E. 6280 B.E. B.E. 11960
21000 3 000 8.2 -20-10 8.2 -20-10 B.E. B.E. 7000 B.E. B.E. 14200
22000 3 000 8.2 -20-10 9.00-20-10 B.E. B.E. 7000 B.E. B.E. 1 000
24000 3 000 8.2 -20-10 9.00-20-12 B.E. B.E. 7000 RPO H94
or J09 RPO H94 or J09 17000
24000 3 000 9.00-20-12 9.00-20-10 RPO F43 RPO F43 9000 B.E. B.E. 1 000
26000 3 000 900-20 12 9.00-20-12 RPO F43 RPO F43 9000 RPO H94
or J09 RPO H94 or J09 17000
TE 0
Air Brakes
133
14
17
21000 3 000 8.2 -20-10 8.2 -20-10 B.E. B.E. 7000 B.E. B.E. 14200
22000 3 000 8.2 -20-10 8.2 -20-12 B.E. B.E. 7000 B.E. B.E. 1 280
23000 3 000 8.2 -20-10 9.00-20-10 B.E. B.E. 7000 B.E. B.E. 16160
24000 3 000 8.2 -20-10 9.00-20-12 B.E. B.E. 7000 B.E. B.E. 17000
26000 42000 9.00-20-12 9.00-20-12 RPO F43 RPO F43 9000 B.E. B.E. 17000
MEW 149
167
18 30000 -7. 0-20-8 8.2 -20-10 B.E. B.E. 6280 B.E. B.E. 28000
CHEVROLET TRUCK SERVICE MANUAL

GENERAL INFORMATION 0-8
GASOLINE
MOOELS WHEEL
BASE GVW
(POUNDS) * GCW (POUNDS)
RECOMMENDED
MINIMUM TIRES
MINIMUM MANDATORY EQUIPMENT FOR GVW OR GCW RATING
FRONT
SPRINGS
MAXIMUM
FRONT END
WEIGHT AT
GROUNO * REAR
AXLE REAR
SPRINGS
MAXIMUM
REAR END
WEIGHT AT
GROUND *
FRONT REAR
(DUAL) FRONT AXLE
CE60
12
137
149
167
173
179
189
203
218
19000 -8.2 -20-10 8.2 -20-10 B.E. B.E. 7000 B.E. B.E. 14200
24000 -9.00-20-10 10.00-20-12 B.E. B.E. 7000 B.E. B.E. 17000
2 00 4 000 9.00-20-10 10.00-20-12 B.E. B.E. 7000 RPO H66 RPOG 6 18 00
27 00 c 4 000 9.00-20-10 10.00-20-12 RPO F43 RPO F94 9000 RPO H66 RPOG 8 18 00
27 00 c 60000 d 9.00-20-10 10.00-20-12 RPO F43 RPO F94 9000 RPO H66 RPOG 8 18 00
32000 e 60000 d 10.00-20-12 11.00-20-12 RPO F44 RPO F44 10860 RPO H77 APOH77 20760
TE60
Hydraulic or
Air Brakes
133
14
17
21000 4 000 8.2 -20-10 8.2 -20-10 B.E. B.E. 7000 B.E. B.E. 14200
22000 4 000 8.2 -20-10 8.2 -20-12 B.E. B.E. 7000 B.E. B.E. 1 280
24000 4 000 8.2 -20-10 9.00-20-12 B.E. B.E. 7000 B.E. B.E. 17000
2 00 4 000 8.2 -20-10 10.00-20-12 B.E. B.E. 7000 RPO H63
or H72 RPO H63
or H72 18 00
26000 4 000 9.00-20-12 9.00-20-12 RPO F43 RPO F43 9000 B.E. B.E. 17000
27 00 4 000 9.00-20-12 10.00-20-12 RPO F43 RPO F43 9000 RPO H63
or H72 RPO H63
or H72 18 00
27 00 60000 d 9.00-20-12 10.00-20-12 RPO F43 RPO F43 9000 RPO H63
or H72 RPO H63 or H72 18 00
TE60
Air Brakes
133
14
17
29000 60000 d 8.2 -20-10 11.00-22-12 B.E. B.E. 7000 RPO H74
or H82 RPO H74 or H82 22000
29000 f 60000 d 10.00-20-12 10.00-20-12 RPO F 4 RPO F 4 10 00 RPO H63
or H72 RPO H63
or H72 18 00
31000 f 60000 d 9.00-20-12 11.00-22 12 RPO F43 RPO F43 9000 RPO H74
or H82
RPO H74
^ur H82 22000
32 00 f 60000 d 10.00-20-12 11.00-22-12 RPO F 4 RPO F 4 10 00 RPOH74
or H82 RPO H74 or H82 22000
ME60
149
167
18
36000 4 000 8.2 -20-10 9.00-20-10 B.E. B.E. 7000 B.E. B.E. 30000
39000 4 000 9.00-20-10 10.00-20-12 RPO F43 RPO F94 9000 B.E. B.E. 30000
41000 4 000 10.00-20-12 10.00-20-12 RPO F44 RPO F44 10860 B.E. B.E. 30000
4 000 60000 d 10.00-20-12 10.00-20-12 RPO F44 RPO F44 10860 RPO H 8 RPO H 8 34000
DIESEL
MODELS
CD 0
12
137
149
167
173
179
189
203
218
16000 7. 0-20-8 7. 0-20 8 B.E. B.E. 000 B.E. B.E. 11000
19 00 -8.2 -20-10 9.00-20-10 B.E. B.E. 000 B.E. RPO G 1 000
22000 -8.2 -20-10 9.00-20-10 RPO F48 RPO F48 7000 B.E. RPO G 6 1 000
24000 -8.2 -20-10 9.00-20-12 RPO F48 RPO F48 7000 RPO H21 RPO G 6 17000
CG 0
12
137
149
167
173
179
189
203
218
16000 7. 0-20 8 7. 0-20-8 B.E. B.E. 000 B.E. B.E. 11000
19 00 _8.2 -20-10 9.00-20-10 B.E. B.E. 000 B.E. RPO G 1 000
22000 8.2 -20-10 9.00-20-10 RPO F48 RPO F48 7000 B.E. RPO G 6 1 000
24000 -8.2 -20-10 9.00-20-12 RPO F48 RPO F48 7000 RPO H21 RPO G 6 17000
’ Refer to GVW plate on vehicle. Maximum front and rear end loads on this Load Capacity Chart are
based upon component minimum capacity of axles, springs, or tires.
ADDITIONAL MANDATORY EQUIPMENT
a. RPO J70 Power Brake Equipment
b. RPO F03 Heavy Duty Frame for GVW rating.
c. RPO Z 0 Frame Reinforcement for GVW rating.
d. RPO L43 427 Cu.ln. Engine for GCW rating.
e. RPO F02 Hi Tensile Frame and Reinforcement for GVW rating.
f. RPO F07 Hi Tensile Frame Reinforcement.
g. RPO F10 Heat Treated Frame Reinforcement.
h. L Frame Reinforcement required for dump and off road application.
i. RPO L29 478 Engine for GCW rating,
j. RPO M81 or M8 Transmission.
m, RPO F06 Frame Reinforcements,
o. CPO Frame Inner Channel Reinforcement,
p. CPO Frame Reinforcement for GCW rating.
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-9
LUBRICATION (INCL. ENGINE FUEL)
AND MAINTENANCE
INDEX
Engines
Crankcase Capacities ....................................................................... ...... 0-9
Gas Engine Fuel Requirements ....................................................... ...... 0-9
Gas Engine Oil Recom mendations................................................. ...... 0-10
Air Cleaner C are................................................................................ ...... 0-11
Emission Control Systems .............................................................. ...... 0-11
Tune-up, Emission Control and
Electrical System C hecks ................................................................ ...... 0-12
Coolant Recommendations ............................................................ ...... 0-13
Fuel System ....................................................................................... ...... 0-14
Diesel Engine Fuel Selection .......................................................... ...... 0-14
Diesel Engine Oil Recommendations ............................................. ...... 0-15
Clutch and Transmissions ................................................................... ...... 0-15
Clutch ................................................................................................ ...... 0-15
Synchromesh and Auxiliary 4-Speed ............................................. ...... 0-15
Automatic Transmissions ................................................................... ...... 0-16
o w erg lid e.........................................................................................
...... 0-16
Tubro Hydra-Matic............................................................................ ...... 0-16
A llis o n ................................................................................................ ...... 0-16
Rear A xles............................................................................................. ...... 0-16
ositraction .......................................................................................
...... 0-17
Two Speed A x le s .............................................................................. ...... 0-17
ropeller Shaft Slip Joints .............................................................. ...... 0-17
Universal J o in ts................................................................................ ...... 0-17
Four Wheel Drive ................................................................................ ...... 0-17
Front A x le ......................................................................................... ...... 0-17
Air Vent Hose ........................................................................................0-17
Transfer C as e....................................................................................
......0-17
Control Lever and Linkage.............................................................. ..... 0-17
Brakes.................................................................................................... ..... 0-17
arking Brake.................................................................................... ..... 0-17
Hydraulic Brake System ................................................................... ..... 0-17
ower Brake Vacuum U n its ............................................................ ..... 0-18
Full Air Brakes..................................................................................
..... 0-18
Wheels and T ire s .................................................................................. ..... 0-18
Wheel Nut Torques ........................................................................... ..... 0-18
Wheel Bearings..................................................................................
..... 0-19
Tires.................................................................................................... ..... 0-19
Steering.................................................................................................. ..... 0-19
Standard Steering.............................................................................. ..... 0-19
ower Steering.................................................................................. ..... 0-19
Suspension ........................................................................................... ..... 0-20
Independent Front Suspension ....................................................... ..... 0-20
I—Beam Front Suspension .............................................................. ..... 0-20
Rear Suspension................................................................................ ..... 0-20
Tandem Rear Suspension ................................................................ ..... 0-20
Speedometer A da p te r ......................................................................... ..... 0-20
Tachometer—Mechanical..................................................................... ..... 0-20
Body Lubrication ................................................................................ ..... 0-20
Cleaning Trucks.................................................................................... ..... 0-20
Extended Vehicle Storage .................................................................. ..... 0-21
Lubrication Diagrams ......................................................................... ..... 0-22
The time or mileage intervals for lubrication and
maintenance services outlined in this section are intended
as a guide for establishing regular maintenance and lu
brication periods. Sustained heavy duty and high speed
operation or operation under adverse conditions may
require more frequent servicing.
ENGINES
CRANKCASE CAPACITIES-GASOLINE AND DIESEL ENGINES
Crankcase Oil Filter
Engine Type
With Oil
Filter
Change
Without Oil
Filter
Change Type Capacity
Standard
(Opt.)
U.S. IM . U.S. IM .
250 Cu. In. L6 (Gasoline) 54-1/4 4 3-1/4 Throw Away 1
292 Cu. In. L6 (Gasoline) 6554-1/4 Throw Away 1 (2 Qt.)
307 Cu. In. V8 (Gasoline) 54-1/4 4 3-1/4 Throw Away 1
350 Cu. In. V8 (Gasoline) 10-40 65 5 4-1/4 Throw Away 1
350 Cu. In. V8 (Gasoline) 50 Series 75-3/4 5 4-1/4 Repl. Element 2
366 Cu. In. V8 (Gasoline) 86-3/4 6 5 Repl. Element 2
396 Cu. In. V8 (Gasoline) 6554-1/4 Throw Away 1
427 Cu. In. V8 (Gasoline) 8 6-3/4 6 5 Repl. Element 2
159 Cu. In. L3 (Diesel) 11.5 9-1/2 9.5 8 Repl. Element 1
212 Cu. In. L4 (Diesel) 14 11-3/4 12 10 Repl. Element 2
478 Cu. In. V6 (Diesel) 10.5* 8* 11-3/4* Repl. Element 2.5
*Add 1 qt. if equipped with oil cooler
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-10
GASOLINE ENGINE FUEL REQUIREMENTS
Trucks are designed to operate efficiently on “ Regu
la r” grade fuels commonly sold in the United States and
Canada.
Engine Fuel Grade
All 6-Cyl. and V-8 Regular
Use of a fuel which is too low in anti-knock quality will
result in “ spark knock” . Since the anti-knock quality of
all regular grade or of all premium grade gasolines is
not the same and factors such as altitude, terrain and air
temperature affect operating efficiency, knocking may
result even though using the grade of fuel recommended.
It may be necessary to change to a higher grade of gaso
line and if knocking continues, further check on th con
dition of the engine will be necessary.
In any case, continuous or excessive knocking may
result in engine damage and constitutes misuse of the
engine for which the Chevrolet Division is not responsible
under terms of the Manufacturer's New Vehicle
Warranty.
Operation in a Foreign Country
If it is planned to operate a truck outside the continen
tal lim its of the United States or Canada, there is a
possibility that the best fuels available are so low in
anti-knock quality that excessive knocking and serious
engine damage may result from their use. To minimize
this possibility, it is suggested that customers write to
Chevrolet Motor Division, Owner Relations Department,
Detroit, Michigan 48202, giving:
1. The compression ratio of the engine.
2. The Vehicle Identification Number.
3. The country or countries in which the customer plans
to travel.
The customer will be furnished details of adjustments
or modifications which should be made to the engine by
the Chevrolet Dealer prior to departure.
Failure to make the necessary changes to the truck and
subsequent operation under conditions of continuous or
excessive knocking is considered misuse of the engine
for which the Chevrolet Motor Division is not responsible
under terms of the Manufacturer's New Vehicle
Warranty.
After arriving in a foreign country, contact should be
made at the nearest authorized General Motors Dealer
for brand names of the best fuels available and advice as
to where they may be purchased.
GASOLINE ENGINE OIL RECOMMENDATIONS
Use only engine oil which meets GM 6041-M standard.
High quality oils which are intended for service MS and
pass car maker's tests are of this quality. The oil
change interval (see section of “ Engine Oil Change In
terval” ) and the new vehicle warranty are based on the
use of oils that meet these requirements.
NOTE: Non-detergent and other low quality
oils are specifically not recommended. The use
of proper engine oils and oil change intervals
are the best assurance of continued reliability
and performance.
Supplemental Engine Oil Additives
The regular use of supplemental additives is specifi
cally not recommended and will increase operating costs.
However, in cases of specific problems which may arise
under certain conditions, additive supplements are avail
able that can effectively and economically solve these
problems without causing other difficulties. For example,
if higher detergency is required to reduce varnish and
sludge deposits resulting from some unusual operational
difficulty, a thoroughly tested and approved concentrate—
“ Engine Oil Supplement” —is available.
Checking Oil Level
The engine oil should be maintained at proper level.
The best time to check it is before operating the engine
or as the last step in a fuel stop. This will allow the oil
accumulation in the engine to drain back in the crankcase.
To check the level, remove the oil gauge rod (dip stick),
wipe it clean and reinsert it firm ly for an accurate read
ing. The oil gauge rod is marked “ F U LL” and “ ADD
O IL” . The oil level should be maintained in the safety
margin, neither going above the "F U L L ” line nor below
“ ADD O IL” line. Reseat the gauge firmly after taking
the reading.
NOTE: The oil gauge rod is also marked. “ Use
GM 6041-M Quality MS o il'' as a reminder to use
only high quality oils as prescribed under “ En
gine Oil Recommendations.”
Engine Oil Change Interval—Series 10-30
Change oil each 4 months. If more than 6,000 miles
are driven in a 4-month period, change oil each 6,000
miles.
In certain types of service including operation under
dusty conditions, trailer hauling, extensive idling, serv
ice where the operation is prim arily 10-mile or shorter
trips, or ROLONGED O ERATION AT SUB-ZERO
TEM ERATURE, OIL CHANGE INTERVALS SHOULD
NOT EXCEED 2 MONTHS OR 3,000 MILES, whichever
occurs first. Operation in dust storms may require an
immediate change of oil.
The above recommendations apply to the first change
as well as subsequent oil changes. The oil change in
terval for the truck engine is based on the use of oils
that meet the requirements indicated in the section on
"Engine Oil Recommendations.” Oil change intervals
longer than those listed above will result in serious re
ductions in engine life and may affect Chevrolet's obliga
tion under the provisions of the new vehicle warranty.
A high quality MS oil meeting General Motors Standard
GM 6041-M was installed in the engine at the factory. It
is not necessary to change this factory-installed oil prior
to the recommended normal change period. However, the
oil level should be checked more frequently during the
break-in period since somewhat higher oil consumption
is normal until the piston rings become seated.
Engine Oil Change Interval—Series 40-60
Change engine oil every 60 days even though less than
1,000 miles have been driven. If more than three thou
sand miles are driven in a 60-day period, change oil
every three thousand miles. This interval applies to the
initial change as well as subsequent oil change. An MS
oil, which meets General Motors Standards GM-6041M
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-11
(GM-6042M for Diesel engines) was installed in your en
gine at the factory. It is not necessary to drain this
original factory installed oil prior to the recommended
normal change period. However, the oil level should be
checked more frequently during the break-in period since
somewhat higher oil consumption is normal until piston
rings become seated.
Certain driving conditions, such as dust storms and
frequent driving on dusty roads, necessitate more fre
quent oil changes.
Recommended Viscosity
The following chart will serve as a guide in selecting
the proper oil viscosity. The proper viscosity helps as
sure good cold and hot starting by reducing friction and
thus increasing cranking speed.
• SAE 5W and 5W-20 oils are not recommended for
sustained high speed driving.
• SAE 30 oils may be used at temperatures above
60°F.
RECOMMENDED SAE VISCOSITY NUMBER
lo w , W -30, 10W-30, 10W -40
- 30 — 20 0 20 40 60 80 100
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE, °F.
Fig. 3—O il Vis osity Guide
Engine Oil Filter Replacement—Series 10-30
Replace filter at first oil change and at every second
oil change thereafter. This recommendation is based on
the use of engine oils that meet the requirements indi
cated in the section on "Engine il Recommendations,”
and the use of the applicable A.C. oil filter or equivalent.
Engine Oil Filter Replacement—Series 40-60
Replace 1 quart filter at each oil change. This recom
mendation is based on the use of engine oil which meets
the requirements indicated in the section on "Engine Oil
Recommendations/’ and the use of the applicable A.C. oil
filter or equivalent.
When 2 quart elements are installed, the oil filter
should be replaced at the engine oil change nearest 6000
mile interval or every 4 months, whichever occurs first.
Driving under severe dust conditions or prolonged idling
may warrant replacing the cartridge more often.
AIR CLEANER CARE
CAUTION: In addition to its function of filtering
air drawn into the engine through the carburetor,
the air cleaner also acts as a flame arrestor in
the event the engine backfires. Because back-
firing may cause fire in the engine compart
ment, the air cleaner should be installed at all
times unless its removal is necessary for re-
pair or maintenance services.
NOTE: Under prolonged dusty driving condi
tions, it is recommended that these operations
be performed more often.
Paper Element Type
First 12,000 miles, inspect element for dust leaks,
holes or other damage, replace if necessary. If satis
factory, rotate element 180° from originally installed
position. Replace element at 24,000 miles. Element
must not be washed, oiled, tapped or cleaned with an air
hose.
Oil Bath Type
Check every 12,000 miles (2,000 miles on Diesel en
gines). Clean if necessary, and refill with engine oil,
SAE 50, when temperature is above freezing and SAE 20
below freezing.
Oil Welted Paper Element with
Polyurethane Wrap
This dual element air cleaner has extremely long life
and will not require replacement for 50,000 to 100,000
miles under normal operating conditions.
Cleaning and oiling of the polyurethane wrap should be
done at 24,000 miles under normal highway or city-type
operation. Service under off-the-road or extremely dusty
operations should be performed at 12,000 miles or less
depending upon severity of operating conditions.
To clean: Remove polyurethane wrap from paper ele
ment, wash in suitable solvent to remove oil and dirt.
Squeeze dry, dip in engine oil and squeeze to remove ex
cess oil (never shake or wring—always squeeze). Wrap
element in clean dry cloth and squeeze out any remaining
oil.
Flame Arrestor
Clean the arrestor every 12,000 miles.
Crankcase Ventilation Filter (Located within
Air Cleaner)
If so equipped, inspect at every oil change and replace
if necessary. Replace at least every 24,000 miles; more
often under dusty driving conditions.
EMISSION CONTROL SYSTEMS
Positive Crankcase Ventilation (P.C.V.)
The ositive Crankcase Ventilation system, which is
standard equipment, prevents emission of gases from the
crankcase. The .C. V. system connects the crankcase
and intake manifold of the engine and crankcase gases
are returned through this system to the combustion
chamber where they are burned. eriodic inspection and
required servicing of the .C.V. system assures a
cleaner-better-performing, longer-lasting engine. A
plugged .C.V. system results in a loss of crankcase
ventilation which can cause condensation of gases in the
crankcase, resulting in the formation of acids, sludge
build-up and oil dilution. This also results in an in
crease in exhaust emissions due to carburetor enrich
ment. Every 12 months or 12,000 miles, whichever
occurs first the .C.V. valve should be replaced.
NOTE: If the positive crankcase ventilator
valve should become clogged, the engine idle
will be adversely affected. Therefore, if the
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-12
engine idle becomes too slow or rough, the ven
tilator valve should be checked before any
carburetor adjustments are made to compensate
for the trouble.
Air Injection Reactor System (A.I.R.)
The Air Injection Reactor system is designed to reduce
air pollution caused by exhaust emissions. It is entirely
separate from the ositive Crankcase Ventilating system.
The Air Injection Reactor system operates by oxidizing
(or buring) the hydrocarbons and carbon monoside as
they are expelled from the combustion chamber into the
exhaust. A positive displacement air pump, driven by the
engine, compresses clean filtered air, which is distrib
u ted and injected at the exhaust port of each cylinder.
This fresh air mixes with the hot exhaust gases and pro
motes further oxidation (or burning) of both hydrocarbons
and carbon monoxide by converting some of them to car
bon dioxide and water. This does not reduce the danger
of inhaling carbon monoxide in confined areas. Supple
menting the air pump a special calibrated carburetor and
distributor plus related components are required.
The Air Injection Reactor system should have the
A.I.R. pump drive belts inspected for wear and tension
every 12 months or 12,000 miles, whichever occurs first.
In addition, complete effectiveness of the system, as well
as full power and performance, depends upon engine idle
speed, ignition timing, and idle fuel mixture being set
according to specification. A quality tune-up which
includes these adjustments should be performed periodi
cally to assure normal engine efficiency, operation and
performance.
Controlled Combustion System (C.C.S.)
The Controlled Combustion System is designed to re
duce air pollution from exhaust emissions by improving
combustion efficiency. It is entirely separate from the
ositive Crankcase Ventilating system. This is done by
providing heated air to the carburetor which permits
running on leaner mixtures for improved combustion.
Other engine modifications consist of a special cali
brated carburetor and distributor and related compo
nents. Complete effectiveness of the system, as well as
full power and performance, depends upon engine idle
speed, ignition timing, and idle fuel mixture being set
according to specification. A quality tune-up which in
cludes these adjustments should be performed periodi
cally to assure normal engine efficiency, operation and
performance.
Transmission Controlled Spark (T.C.S.)
rocedures for checking the operation of this system
are outlined in Section 6T of this manual.
This is an electrically-operated system that eliminates
the distributor vacuum spark advance in all forward
transmission gears (or ranges, for automatics) except
high for a significant reduction of hydrocarbon and carbon
monoxide emissions. To do this, a transmission-mounted
switch controls a solenoid valve which regulates mani
fold vacuum to the distributor; during operation in the
low gears (or ranges) the solenoid valve reduces vacuum
supply to the distributor for a retarded spark condition;
during high gear the solenoid valve allows full manifold
vacuum to the distributor for advanced spark. Cold start
conditions are met by means of an override switch. When
the engine is cold, this water temperature sensitive
switch circumvents normal operation of the system by
directly activating the solenoid valve for advanced spark.
On some engines a “ Hot” override terminal is combined
with the switch to allow vacuum advance if engine tem
peratures rise above 232°F.
Evaporation Emission Control (E.E.C.)
This system is designed to reduce fuel vapor emission
that normally vents to the atmosphere from the gasoline
tank and carburetor fuel bowl. Every 12 months or 12,000
miles, whichever occurs first, (more often under dusty
conditions), the filter in the base of the canister must be
replaced and the canister inspected. A ll other parts are
serviced as a complete replacement as outlined in Sec
tion 8.
ENGINE TUNE-UP, EMISSION CONTROL AND
ELECTRICAL SYSTEM CHECKS
Fuel and electrical systems are subject to wear and
contamination and require periodic cleaning and adjust
ments to maintain maximum economy and performance.
roper adjustment of engine idle speed, idle fuel mix
ture, ignition timing and operation of the ositive Crank
case Ventilation Valve ( CV) are important to control
hydro-carbon and CO emissions within government leg
islated levels. These adjustments and an operational
check of the CV Valve should be made at the first oil
change (4 months or 6,000 miles, whichever occurs first).
The above fuel and electrical system checks also are in
cluded in engine tune-ups which are recommended at one
year or 12,000-mile intervals.
Manifold Heat Control Valve
Check manifold heat control valve for freedom of op
eration. If shaft is sticking, free it up with GM Manifold
Heat Control Solvent or its equivalent.
Drive Belts
Every 6000 miles — Inspect drive belts for wear,
fraying, cracking, and tension. Belts which are in poor
condition should be replaced immediately.
Check tension by applying moderate thumb pressure
midway between pulleys. If the center to center distance
between pulleys is 13 to 16 inches, the belt should deflect
1/2 inch. If the center to center distance is 7 to 10
inches, the belt should deflect 1/4 inch. Loose belts
should be retensioned to give the correct deflection.
Electrical System
CAUTION: Headlamp aim should also be
checked periodically. It is important that any
malfunctions be corrected promptly for safety.
Distributor
Correct distributor point gap is very important. The
distributor points are cleaned and adjusted as part of a
good engine tune-up. If their condition is questioned,
release the distributor cap clamps, remove cap and lift
off rotor. Separate the points and inspect them for
being badly burned. Clean the points with a breaker
point file. If the points do not clean up with a few strokes
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-13
of the file they should be replaced. Adjust ignition timing
after points have been replaced.
Fill the hinge cap oiler with engine oil every 12,000
miles on the 366 V-8 engine. Rotate the cam lubricator
1/2 turn on 6 cylinder models or turn lubricator end for
end on 8 cylinder models. Replace the lubricator at
24,000 mile intervals.
Battery (Energizer)
CAUTION: Disconnect battery ground strap
when charging battery to prevent accidentally
reverse polarizing the charging system and
causing damage to the system.
The liquid level in the battery should be checked peri
odically by inspecting the second battery cap from the
positive terminal. If the "e y e ” has a dark appearance,
the liquid is at a proper level. The "e y e” will glow if the
liquid level is low. Normally, when the "eye” indicates
a low liquid level condition, the other five cells should be
checked.
If the liquid level is found to be low, water should be
added to each cell until the liquid level rises to the bot
tom of the split ring. DO NOT OVERFILL. If the bat
tery is continaully low, have generator regulator checked.
Distilled water should be used in order to eliminate the
possibility of harmful impurities being added to the
electrolyte. DO NOT ADD ANY SUBSTANCE TO THE
ELECTRO LYTE EXCE T WATER.
In freezing weather the vehicle must be driven after
adding water to properly mix it with the electrolyte and
prevent freezing.
Battery—Gas Warning
Since normal battery or Energizer chemical reaction
generates hydrogen gas which is explosive when mixed
with air, never expose the battery to an open flame or
electric spark. Also, avoid getting battery fluid, which
is a sulfuric acid solution, on skin, on clothing or other
fabrics, or on painted surfaces. Eye protection should be
worn while working on the battery for any reason.
Battery Terminals
The bolt-on battery cable terminals must be clean and
tight. When corrosion appears on the terminals they
should be cleaned in a solution of baking soda and water
or ammonia and water. After cleaning, the top of the
battery should be flushed off with clean water. Saturate
terminal washer with engine oil every 6000 miles.
Generator
The connections in the entire charging system must be
kept tight and free from corrosion or anything that will
cause high resistance in the circuit.
NOTE: Never remove Delcotron bat lead with
out first disconnecting battery ground cable.
CAUTION: Do not short across or attempt to
polarize system.
Spark Plugs
Clean the spark plugs thoroughly, using an abrasive
type cleaner. If the porcelain is badly glazed or blis
tered, the spark plugs should be replaced. A ll spark
plugs must be of the same make and heat range.
Starting Motor
Check the solenoid mounting and starting motor mount
ing attaching bolts periodically.
Headlight Aiming
roper aiming of the headlights is most important to
assure sufficient illumination of the highway without
blinding other motorists.
Bulb Service
Due to the different types of lamps, there are several
different procedures covering bulb replacement. The
bulb sockets for the parking lamps unsnap and pull out of
the housings. All lamps on the rear of the vehicle have
lenses only that are attached directly to the lamp body.
To remove the bulb after access has been gained, push
bulb in slightly and turn it counterclockwise as far as
possible and pull it out of its socket. To install new
bulb, line up pins on sides of bulb with the grooves in
socket and push in place and turn clockwise to lock it in.
Reassemble lamp and be careful of lamp lens seal (if so
equipped).
COOLANT RECOMMENDATIONS
The inhibited year-around engine coolant, used to fill
the cooling system at the factory is a high quality solu
tion that meets General Motors Specification 1899-M.
This factory-fill coolant solution is formulated to with
stand two full calendar years of normal operation without
draining or adding inhibitors, provided the same concen
tration of coolant is added if the system needs additional
fluid between drain periods. The original factory fill
coolant provides freezing protection to -20°F (-32°F in
Canada).
Every two years, the coolant system should be serv
iced as follows:
1. Drain coolant, when hot, through the radiator drain
valve.
2. Close valve and add sufficient plain water to fill
system.
3. Run engine until normal operating tempreature is
reached.
4. Drain and refill the system as described in steps 1,
2, and 3 a sufficient number of times until the drained
liquid is colorless.
5. Allow system to drain completely and then close
radiator drain valve tightly.
6. Add the necessary amount of high quality inhibited
glycol base coolant meeting GM Specification 1899-M
to provide the required freezing and corrosion pro
tection (at least to 0°F.)
7. Run engine until normal operating temperature is
reached.
8. Check and adjust level of coolant after system has
cooled sufficiently to remove radiator cap.
The freeze protection should be at a level commen
surate with the temperatures which may occur in the
area in which the vehicle will be operated. Regardless
of whether freezing temperatures are or are not ex
pected, cooling system protection should be maintained
at least to 0°F. to provide adequate corrosion protection.
When adding solution due to loss of coolant for any reason
or in areas where temperatures lower than -20°F. (-32°F
in Canada) may occur, a sufficient amount of an ethylene
glycol base coolant meeting GM Specification 1899-M
should be used.
NOTE: Alcohol or methanol base coolants or
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-14
plain water are not recommended for your ve
hicle at any time.
The coolant level should be approximately one inch be
low bottom of the filler neck on downflow when engine is
cold. On crossflow radiators, if the engine is cold, the
coolant level should be three inches below bottom of filler
neck. On A 20-30 models the coolant level should be
1/2" to 1" below bottom of filler neck when engine is hot.
If checked when engine is cold, the coolant level should
just cover the ends of the tubes. DO NOT OVERFILL.
CAUTION: When the engine is at normal oper
ating temperature or above, the internal pres
sure built up in the cooling system will blow out
scalding fluid and vapors if the radiator cap is
suddenly removed. To prevent loss of coolant
and to avoid the danger of being burned, the cool
ant level should be checked or coolant added
only when the engine is cool. If the cap must be
removed when the engine is hot, place a cloth
over the cap and rotate the cap slowly counter-
clockwise to first stop and allow pressure to
escape completely. Then turn cap again slowly
counterclockwise to rem ove.
NOTE: Do not remove the radiator cap when
engine is excessively hot, do not put water in an
overheated engine, and do not run engine when
indicator is above “ H” or red indicator light
comes on.
Thermostat
The cooling system is protected and controlled by a
thermostat installed in the engine coolant outlet to main
tain a satisfactory operating temperature of the engine.
This thermostat is designed for continuous use through
both winter and summer and need not be changed sea
sonally.
Radiator Pressure Cap
The radiator cap, a 9, 13 or 15-lb. pressure type, must
be installed tightly, otherwise coolant may be lost and
damage to engine may result from overheating. Radiator
pressure caps should be checked periodically for proper
operation.
FUEL SYSTEM
Inline Filter
Replace entire filter every 24,000 miles.
Fuel Strainer
The frame mounted fuel strainer assembly, located
between the fuel pump and fuel tank (standard equipment
on 60 Series and optional equipment on all other models)
should be replaced seasonally
Fuel Pump
The fuel pump should be checked regularly to make
sure the mounting bolts, cover to body bolts, pulsator
diaphragm cover screws and inlet connections are tight.
Carburetor
Tighten the carburetor to manifold and the manifold to
cylinder head stud nuts to prevent air leaks. Keep the
carburetor clean externally and completely overhauled at
regular intervals.
Carburetor and Throttle Linkage
Lubricate with engine oil every 12,000 miles.
Fuel Filter Element--The gasoline fuel filter element
must be replaced in the event of carburetor flooding.
The filter element located in the carburetor inlet is to be
replaced every 12 months or 12,000 miles, whichever
occurs first.
NOTE: When also equipped with an in-line fuel
filter, it will be necessary to change this carbu
retor fuel inlet filter only at each 24,000 mile
interval.
Governor
The attaching bolts should be kept tight, the optionally
available governor should be kept clean externally and the
filter element should be replaced every 12,000 miles.
DIESEL FUEL SELECTION CHART
Type of
Engine Service Typical
Application General Fuel Classification
Distillation Cetane Sulfur
90% Boiling
oint (Max.) Final Boiling oint (Max.) Number (Min.) Content
(Max.)
Light Load and speed
with considerable idling. City Buses No. 1-D 500° F0 550° F. 45 0.30%
Generator sets, industrial Winter No. 1-D
Summer No. 1-D
500°
550°
F.
F.
550° F.
600° F.
45
40
0.30%
0.50%
Light Load and speed. and automotive equipment
in city and suburban
operation
Medium Load and speed. Marine leasure Craft,
Tractors, Industrial Winter No. 1-D 550° F. 600° F. 45 0.50%
equipment. Summer No. 2-D* 625° F. 675° F. 40 0.50%
Heavy Load and high
speed with idling. Highway Trucks Winter No. 2-D*
Summer No. 2-D*
625°
625°
F.
F.
675° F.
675° F.
45
40
0.50%
0.50%
Heavy Load and high
speed.
Heavy Duty Off-the-road
Equipment, Trucks,
Tractors. No. 2-D* 675° F. -40 0.50%
*NOTE: For most satisfactory engine life, use only those No. 2-D diesel fuel oils containing 0.50% or less sulfur.
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-1
DIESEL ENGINE OIL RECOMMENDATION
Satisfactory long-time operation of Heavy-Duty Diesel
Engines requires the use of detergent type ''Heavy-duty
Lubricating O ils” which meet the requirement of Gen
eral Motors Standard GM 6042-M. These oils provide
better lubrications, possess more heat resistance, and
counteract sludge formation more effectively than the
non-detergent type oils. These oils are grouped in ac
cordance with their ability to meet the service require
ments common to Heavy-Duty engine operation.
Recommended Viscosity
Multigrade oils are NOT recommended. The use of an
SAE-30 grade is desirable for year-round use when cold
starting can be accomplished. Multigrade oils should be
considered only as the "last resort" to facilitate starting
when prolonged exposure to temperatures below freezing
is unavoidable and adequate starting aids are unavailable.
Cold weather starting will be facilitated when im m er
sion type electrical coolant heaters can be used. Other
practical considerations, such as the use of batteries,
cables and connectors of adequate size, generators or
alternators of ample capacity, proper setting of voltage
regulators, ether starting aids, oil and coolant heater
systems, and proper fuel selection will accomplish
starting with the use of SAE-30 oil.
Checking Oil Level
The engine oil should be maintained at proper level.
The best time to check it is before operating the engine
or as the last step in a fuel stop. This will allow the oil
accumulation in the engine ot drain back in the crank
case. To check the level, remove the oil gauge rod (dip
stick), wipe it clean and reinsert it firm ly for an accu
rate reading. The oil gauge rod is marked “ FU LL” and
“ ADD OIL” . The oil level should be maintained in the
safety margin, neither going above the “ FU LL” line nor
below “ ADD OIL” line. Reseat the gauge firm ly after
taking the reading.
Engine Oil Change Interval
It is recommended that new engines be started with
100 hour oil change periods. For highway vehicles this
corresponds to approximately 3,000 miles and for city-
service vehicles approximately 1,000-2,000 m iles. The
drain interval may then be gradually increased, or de
creased following the recommendations of the oil sup
plier until the most practical oio change period for the
particular service has been established.
At each oil change, besides draining engine crankcase,
drain oil filter and oil cooler. An oil cooler, rear drain-
cock is for oil drain.
Solvents should not be used as flushing oils in running
engines. Dilution of the fresh refill oil supply can occur
which may be detrimental.
TY E USAGE
MIL-L-2104B
(A I-DG)
Generally satisfactory for light general
service with fuels containing less than
0.5% sulphur.
GM 6042-M All Diesel engine - Normal service
NOTE: Oils of higher additive levels such as
S-3 (A I designation DS) tend to form excessive
ash deposits that could result in engine damage;
such oils are not recommended for use in
Chevrolet Diesel engines.
Crankcase Breather
At each oil change, crankcase breather should be
removed and cleaned in suitable solvent. Do not oil
element.
CLUTCH AND TRANSMISSIONS
CLUTCH
The clutch pedal free travel should be checked at regu
lar intervals.
Lubricate the clutch cross-shaft at fitting every 6000
miles with water resistant E chassis lubricant.
Clutch and Brake edal Springs
Lubricate with engine oil every 6000 miles.
Throw Out Bearing
On trucks equipped with a yoke and shaft type release
lever, the release bearing is lubricated by means of a
hose attached to a grease cup. The grease cup is filled
with a graphite type grease and should be rotated one
turn every 6,000 miles and refilled as required.
SYNCHROMESH AND AUXILIARY
4-SPEED TRANSMISSIONS
The lubricant level in the housing should be checked
every 6,000 miles with unit at operating temperatures.
Lubricant should be level with bottom of filler plug hole.
“ Multi- urpose” gear lubricant meeting U.S. Army
Ord. Spec. MIL-L-2105B is recommended if additions
are required to bring up the lubricant level. The “ Gear
Lubricant Viscosity Table” shows the proper viscosity
lubricant to be used during vehicle operation.
Outside Temperature Viscosity Lubricant To Be Used
Below 10°F SAE 80
Up to 100 °F SAE 90
Above 100 °F SAE 140
Consistently
Either SAE 90 “ Multi- urpose” gear lubricant or SAE
90 Straight Mineral Oil may be used. It is recommended
that any additions required to bring up the lubricant level
be made using the same type of lubricant as in the
housing.
Transmission Shift Linkage (Manual
and Automatic)
Every 6,000 m iles or 4 months—lubricate shift linkage
and, on Manual transmission floor control, lever contact
ing faces with water resistant E chassis lubricant which
meets GM Specification GM 6031M.
Transmission Controls
The steering column manual shift mechanism on 1/2
Ton and 3/4 Ton models equipped with 3 speed transmis
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-16
sion is factory lubricated and should not require periodic
lubrication. However, should the shifting effort become
noticeably greater, lubricate all linkage points with en
gine oil.
AUTOMATIC TRANSMISSIONS
POWERGLIDE TRANSMISSION
EVERY 6000 MILES-Check fluid level on dipstick.
For an accurate oil level check, drive the vehicle several
miles making frequent stops and starts to bring the trans
mission up to normal operating temperature (approxi
mately 180°-190°F.). When checking the oil, park the
vehicle on a level surface, place the selector lever in
" a rk " and with the engine running, note reading. Add
oil only with the transmission hot and the oil level at the
ADD mark. The amount of oil required under these con
ditions is one pint. DO NOT OVERFILL.
General Motors DEXRON® Automatic Transmission
Fluid, art numbers 1050568, 1050569, 1050570 which
has been especially formulated and tested for use in your
automatic transmission is recommended. Other Auto
matic Transmission Fouids identified with the mark
DEXRON® or equivalent are also recommended.
Every 24,000 m iles** (more frequently, depending on
severity of service, if vehicle is used to pull trailers,
carry full loads during high ambient temperatures, op
erate in mountainous terrain or operate under other
severe conditions) —Remove fluid from the transmission
sump and add 2 quarts U.S. measure (1-2/3 quarts Im
perial measure) of fresh fluid. Operate transmission
through all ranges and check fluid level as described
above. It is not necessary to remove the pan because a
drain plug is provided.
**This recommendation applies only to 10 Series Models.
For 20-30 Series Models drain period should be every
12,000 miles.
Powerglide Low Band Adjustment
At the first transmission fluid change, adjust the
owerglide low band.
TURBO HYDRA-MATIC 400 AND TURBO
HYDRA-MATIC 3 0
Lubrication of your Turbo Hydra-Matic will, except for
fluid capacity and filter change listed below, follow the
owerglide transmission recommendations. After check
ing transmission fluid level it is important that the
dipstick be pushed all the way into the fill tube.
Every 24,000 m iles—after removing fluid from the
transmission sump, add approximately 7.5 pints U.S.
measure (6.25 pints Imperial measure) for the Turbo
Hydra-Matic 400 and 2-1/2 qts. U.S. measure (2 qts.
Imperial measure) for the Turbo Hydra-Matic 350 of
fresh fluid, to return level to proper mark on the
dipstick.
Every 24,000 m iles-the Turbo Hydra-Matic 400 trans
mission sump strainer should be replaced.
ALLISON AUTOMATIC TRANSMISSION
Every 2000 miles the fluid level should be checked and
fluid added as described below. DO NOT OVERFILL.
A good grade of 10W engine oil may be used tempo
rarily in emergencies, but must be replaced with DEX
RON or equivalent Automatic Transmission Fluid as
soon as possible.
Checking Fluid
1. Start engine, set parking brake, move control lever
into all drive ranges to fill all clutch cavities and oil
passages and then to the neutral position. Run en
gine at 1000 rpm until engine and transmission have
reached normal operating temperature.
2. Remove any dirt or gravel from area around indica
tor in right side of engine compartment. With engine
running at 1000 rpm remove indicator from case,
wipe clean, reinsert and carefully withdraw again.
CAUTION: Exercise care to prevent dirt from
entering filler tube when checking fluid level.
Add fluid only when level reaches L mark (1 qt. low)
on the indicator.
3. With engine operating at 1000 rpm add sufficient
DEXRON® or equivalent Automatic Transmission
Fluid to bring level to full mark on indicator.
CAUTION: Fluid level should never be higher
than " F ” mark on indicator when fluid is at op
erating temperature. An excessively full trans
mission will result in aeration of the fluid. The
expanding fluid may then be forced out of the
filler tube. Sufficient fluid may be lost to seri-
ously damage the transmission.
4. Reinstall indicator and turn the cap 1/4 turn to lock.
Draining and Refilling
Transmission lubricant should be changed and the
filler replaced after the first 2,000 miles of operation.
Drain, replace the filter, and refill the transmission
every 24,000 miles thereafter if used in normal highway
operation; every 6 months or 12,000 miles, or oftener,
if used for off highway operation, city stop-and-go serv
ice, or other severe service. Approximately 9 qts.
(7-1/2 qts. Imperial measure) of fluid are required to
refill the transmission after the pan has been drained.
Drain immediately after operation — while fluid is still
warm. Do not flush transmission after draining.
Transmission Controls
The brake retarder linkage and throttle valve linkage
for Allison Automatic transmissions should be lubricated
periodically. Contact points between rods, idlers, bell
cranks and supports should be lubricated with SAE 10
engine oil. A lubrication plug is provided in the Auxil
iary 4-speed shift tower. Lubricate every 6000 miles
with water resistant E chassis grease which meets
General Motors Specification #GM 6031M.
REAR AXLES
Check lubricant level (including the inter-axle differen
tial) every 6,000 miles. When necessary, refill to level
of filler plug hole using "M ulti- urpose" gear lubricant
meeting U.S. Arm y ORD. Spec. MIL-L-2105B as shown in
the "G ear Lubricant Viscosity Table.”
Drain the lubricant every 24,000 miles. If the vehicle
is operated in exceptionally heavy work or at continuous
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-17
high speeds, the lubricant should be changed every 12,000
miles. It may be necessary to change lubricant more
often if vehicle is used off road in dusty areas.
POSITRACTION
Same as standard axle but use only the special osi-
traction lubricant.
TWO-SPEED AXLES
The shift unit should be filled with lubricant to the fil
ler opening on the front cover using refrigeration ma
chine oil. The oil level should be checked every 12,000
miles or 3 months, whichever occurs first.
PROPELLER SHAFT SLIP JOINTS
ropeller shaft slip joints should be lubricated every
6,000 miles with water resistant E chassis grease
which meets General Motors Specifications #GM 6031M.
UNIVERSAL JOINTS
Universal joints equipped with lubrication fittings
should be lubricated every 6,000 miles with water re
sistant E chassis grease which meets General Motors
Specification #GM 6031M.
More frequent lubrication may be required on heavy
duty "O ff the Road’ ' operations.
FOUR WHEEL DRIVE
Most lubrication recommendations and procedures for
4 wheel drive-equipped trucks are the same for corre
sponding components of conventional drive trucks. Only
the front axle, including the differential, the transfer
case, which transmits power from the transmission to
either front or rear axles, and associated linkage points
and air vents require special procedures.
FRONT AXLE
The front axle should be checked every 6,000 miles and
refilled with S.A.E. 90 “ Multi- urpose” Gear Lubricant
when necessary. With the differential at operating tem 
perature, fill to the level of filler plug hole. If differen
tial is cold, fill to level of 1/2" below the filler plug
hole. Capacity: 5 pt.
Air Vent Hose
Check vent hose for kinks and proper installation every
6000 miles.
TRANSFER CASE
Check the transfer case level every 6,000 miles and, if
necessary, add lubricant to bring to the level of the filler
plug hole. Use SAE “ Multi-purpose” Gear Lubricant,
meeting requirements of U.S. Ordinance Spec. M IL-L-
2105B and follow the “ Gear Lubricant Viscosity Table”
for proper viscosity “ Multi- urpose” gear lubricant to
be used during vehicle operation.
CONTROL LEVER AND LINKAGE
Since no grease fitting is provided in the control lever
it is necessary to brush or spray engine oil on the lever
pivot point and on all exposed control linkage every 6,000
miles.
BRAKES
PARKING BRAKE
Every 6,000 miles clean and lubricate all parking brake
pivot points with water resistant E chassis grease which
meets General Motors Specification #GM 6031M.
HYDRAULIC BRAKE SYSTEM
The service brake and parkint brake systems are de
signed for braking performance under a wide range of
driving conditions even when the vehicle is loaded to its
full rated vehicle load.
CAUTION: Driving through deep water may
affect brake performance. To assure normal
operation after being wetted, service brakes
must be dried. To dry them quickly, lightly
apply the brakes while maintaining a slow for
ward speed until brake performance returns to
normal.
The service brakes on vehicles equipped with a split
system are designed so that in the event of a hydraulic
fluid leak in one-half of the sytem, the other half still
provides braking action. A brake system warning light
is located in the instrument cluster. The function of this
light is to indicate a malfunction in the regular braking
system. In the event of broken brake lines, major brake
fluid loss, air in the brake lines or a pressure deviation
between the front and the rear wheel brake lines, the
light will come on and stay on while braking. In this
event, the vehicle should not be driven until the cause has
been determined and, if necessary, corrected.
Vehicles equipped with power brakes use engine vac
uum to reduce the braking effort. The system has a
vacuum reserve which will supply two or more power
assisted brake applications after the engine has stopped.
After the vacuum reserve has been exhausted, the vehicle
can still be stopped by using greater pedal force.
The Chevrolet braking system requires very little
care; however, the system should be checked occasion
ally for indications of fluid leak. If leaks are found the
necessary repairs should be made at once. Keep the
brakes properly adjusted. Check all vacuum hose con
nections for leakage.
Master Cylinder
Check master cylinder fluid level in both reservoirs
every 6,000 miles. If the fluid is low in the reservoir,
it should be filled to a point about 1/4" from the top rear
of each reservoir with G.M. Supreme No. 11 Hydraulic
Brake Fluid or equivalent.
Inspection of Brake Lining
CAUTION: Brake linings should be periodically
inspected for wear. The frequency of this in
spection depends upon driving conditions such
as traffic or terrain, and also the driving tech
niques of individual customers.
CHEVROLET TRUCK SERVICE MANUAL

LUBRICATION 0-18
Automatic Brake Adjusters
Most trucks with hydraulic brakes are equipped with
self-adjusting brakes which eliminate periodic brake
adjustments. THE SELF-ADJUSTING MECHANISM IS
ACTUATED, AS NEEDED, WHENEVER THE TRUCK IS
MOVED IN REVERSE AND THE BRAKES ARE A LIED.
POWER BRAKE VACUUM UNITS
Trucks equipped with power brakes utilize engine
vacuum to reduce the braking effort to much less than
is required with regular brakes. A built-in vacuum re
serve will supply two or more power assisted brake ap
plications after the engine has stopped. After the vac
uum reserve has been exhausted, the vehicle can be
stopped utilizing the manual portion of the power brake
syste although considerably more foot pressure will be
needed to stop the vehicle.
Vacuum brake air cleaner for frame mounted vacuum
boosters should be cleaned semi-annually.
FULL AIR BRAKES
Compressor
Remove compressor air strainer and inspect or re
place every 6000 miles or oftener. The element can be
cleaned in kerosene or mineral spirits. Cleaners of the
aromatic compound must not be used. The element
should be squeezed (not wrung) dry after cleaning.
Draining Air Tanks
Condensation must be drained from all air tanks daily.
To drain tanks properly, leave drain cocks open until all
air excapes and draining stops. During extreme cold
weather operation, it may be necessary to use an alcohol
evaporator to prevent moisture from freezing in air
tanks.
NOTE: Daily draining is not necessary if truck
is equipped with the optional moisture ejector
valve.
Quick Release Valve
Every Year or 50,000 Miles: Disassembly valve, clean
all parts and replace the diaphragm.
Brake Chambers
Every Month or 2,000 Miles: Check travel of brake
chamber push rods and adjust brakes if necessary.
Every Year or 50,000 Miles: Disassemble brake
chambers and clean all parts. Install new diaphragms.
Drain Cocks
All drain cocks should be periodically checked for
leakage.
Safety Valve
Every Year or 50,000 Miles: The safety valve should
be removed, disassembled and thoroughly cleaned.
Single Check Valve
Every Year or 50,000 Miles: The check valve should
be dismantled and thoroughly cleaned.
Low Pressure Indicator
Every Month or 10,000 Miles: Check the electrical
connections and the air pressure at which the contacts
close.
Brake Valve (Standard Brake System)
Every Year or 50,000 Miles: Disassemble brake valve
and clean all parts. Install new inlet valves and piston
seals.
Brake Control Valve (Dual Brake System)
Every 200 operating hours or after 5,000 miles or once
each month, lubricate pedal mechanism. Also check the
lever’ s linkage for adjustment and/or binding.
Every 3,600 operating hours or after each 100,000
miles, clean and replace parts as required.
Every 7,200 operating hours or after 200,000 miles, or
every two years, disassemble brake valve, clean and in
spect all parts. Install new parts where they are found
to be worn or damaged.
Emergency Valve
Every year or after 50,000 miles, the Emergency
Valve should be disassembled, cleaned and lubricated.
Rubber parts should be replaced and any other parts
showing signs of wear or damage should also be
replaced.
Double Check Valves
Once a year or every 50,000 miles, the check valve
should be removed, dismounted, and cleaned.
Tractor Protection Valve
Thoroughly check and if necessary clean, replace
parts and lubricate.
Double Check Valve and Stop Lamp Switch
Every month or after 10,000 miles, check the electri
cal connections and the operation.
Every year or after 50,000 miles, the combined stop
light switch and double check valve should be disassem
bled and cleaned and parts replaced as required.
Relay Valve
Once a year check valve, clean or replace parts.
Front Brake Limiting Valve
Front brake limiting valve is used on some vehicles
to provide a means of reducing the air pressure applied
to the front brakes when operating on slippery road.
utting the lever in ' 'SLI ERY ROAD” position re
duces pressure on front brakes to half of that on rear
brakes so that front wheels have less tendency to slide
and steering control is maintained. Keep lever in “ DRY
ROAD” position under all normal operating conditions.
WHEELS AND TIRES
WHEEL NUT TORQUES-
10-30 Series
On a new vehicle or after the wheel has been changed,
the wheel nut torque must be checked at 100, 1,000 and
6,000 miles and every 6,000 miles thereafter.
CHEVROLET TRUCK SERVICE MANUAL