Case 150-190 User manual

150-190, T90
2310, 2510 & 2712
Compact Tractors
Service Manual
9-77981
IReprinted I

THIS SAFETY ALERT SYMBOL INDICATES IMPORTANT SAFETY
MESSAGES IN THIS MANUAL. WHEN YOU SEE THIS SYMBOL,
CAREFULLY READ THE MESSAGE THAT FOLLOWS AND BE
ALERT TO THE POSSIBILITY OF PERSONAL INJURY OR DEATH.
M171B
If Safety Decals on this machine use the words Danger, Warning or Caution,
which are defined as follows:
• DANGER: Indicates an immediate hazardous situation which if not avoided,
will result in death or serious injury.The color associated with Danger is RED.
• WARNING: Indicates an potentially hazardous situation which if not avoided,
will result in serious injury. The color associated with Warning is ORANGE.
• CAUTION: Indicates an potentially hazardous situation which if not avoided,
may result in minor or moderate injury. It may also be used to alert against
unsafe practices. The color associated with Caution is YELLOW.
If Safety Decals on this machine are ISO two panel Pictorial, decals are defined
as follows:
• The first panel indicates the nature of the hazard.
• The second panel indicates the appropriate avoidance of the hazard.
• Background color is YELLOW.
IC'\
• Prohibition symbols such as \:::I X and 8 if used, are RED.
~ WARNING
IMPROPER OPERATION OF THIS MACHINE CAN CAUSE INJURY OR
DEATH. BEFORE USING THIS MACHINE, MAKE CERTAIN THAT EVERY
OPERATOR:
• Is instructed in safe and proper use of the machine.
• Reads and understands the Manual(s) pertaining to the machine.
• Reads and understands ALL Safety Decals on the machine.
• Clears the area of other persons.
• Learns and practices safe use of machine controls in a safe, clear area
before operating this machine on a job site.
It is your responsibility to observe pertinent laws and regulations and
follow Case Corporation instructions on machine operation and
maintenance.
© 2001 Case Corporation Bur 0-00000
issued November, 1994
CASE and IH are registered trademarks of Case Corporation
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Service Manual
150-190 & T90 Compact Tractors
2310, 2510 & 2712
Compact Tractors
Rae 9-77981
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CASE 150, 190 AN·D T90 COMPACT TRACTOR
Table of Contents
I-SPECIFICATIONS
Section Form No.
C-Specifications, Engine ................................. 9-77761
F-Electrical ........................................ 9-77701
Wiring Diagram, 150-190 ................................ 9-77861
Wiring Diagram, T90 ................................... 9-77891
II-ENGINE
M-Assemblies Contained in the Engine Block . . . . . . . . . . . . . . . . . 9-77711
Ill-FUEL SYSTEM
N-Carburetor 9-77611
NN-Fuel Pumps ...................................•.. 9-77741
IV--HYDRAULIC SYSTEM
A-How It Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77901
B-Hydraulic Pump .................................... 9-77621
D-Control Valve ..................................... 9-77631
DD-Orbital Motor .................................. . 9-77641
V-STEERING
O-Steering System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . '9-77661
~~---
OO- Front Axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77811
VI -TRANSMISSION
S-Transm ission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77691
Rae. Form 9- 77981
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COLT 2310, 2510 AND.2712COMPACT TRACTORS
Table of Contents
II-ENGINE
Section Form No.
10-Specifications, 2310 and 2510-HHl00 . . . . . . . . . . . . . . . . . . . . . 691462
10-Specifications,2712- HH120. . . . . . . . . . . . . . . . . . . . . . . . . . . . 691462
3, 8 -Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 691462
3-Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 691462
2,4,5,6, 7 and 9 Assemblies Contained in the Engine Block . . . . . . . . . 691462
2, Carburetor 691462
IV-HYDRAULIC SYSTEM
A-How It Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77901
B-Hydraulic Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77621
D-Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77631
DD-Orbital Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-77641
V-STEERING
O-Steering System
00- Front Axles . . . . . .
VI ..TRANSMISSION
S-Transmission .................................... .
Rae. Form 9-77981-1
9-77661
9-77811
9-77691
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1
Series
General
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Rae. Form 9-77761
SECTION
C
SPECIFICATIONSFOR
K 241 AND K 301
ENGINES

K241 ENGINE SPECIFICATIONS
Type-------- ----------- Kohler, 1 Cylinder, 4 Stroke Cycle
Air Cooled, "L" Head Engine
Bore ----------------------------------------- 3.250 Inches
stroke---------------------------------------------2.880 Inches
Piston Displacement ----------------------------- 23.9 CUbic Inches
Compression Ratio ----------------------------------------- 6 to 1
Max. Comp. at Cranking Speed (Engine at Operating
Temperature)--------------------------- 110 to 120 PSI at Sea Level
Crankcase Vacuum(Engine Running)--- 5to lOinches Vacuum at Sea Level
Jgnf.tion-------··--------------------- 12 Volt Coil, Breaker Point
CYLINDER BORE
Diameterof Cylinder Bore Std. A, B ------------ 3.2505-3.2545 Inches
.010 Oversize A, B + 10--------------- 3.2605-3.2615 Inches
,020 Oversize A, B + 20 a.2705-a.z715 Inches
,030 Oversize A, B + 30 --------------- 3.2805-3.2815 Inches
CyliDder Bore Must Be Bored or Honed Oversize If Taper or Out OfRound
Exceeds-------------------------------------.005 Inches
PISTON AND PISTON PIN
Diameter of Std. Piston at Bottom of Skirt ------- 3.2470-3.2480 Inches
Diameter of Std. Piston at Top of Skirt ---------- 3.2425-3.2535 Inches
(Measured Just Below Oil Ring)
Diameter of Std. Piston at Top ------------------- 3.218-3.220 Inches
Piston Pin -------------------------- Full Floating Type, Retained In
Place With Two Retainer Rings.
Piston Pin Bore in Piston Std. -------------------- .8595-.8596 Inches
Piston Pin Diameter std. ------------------------ .8591-.8593 Inches
.005 oversize------------- .8641-.8643 Inches
Piston Pin Length------------------ 2.738-2.753 Inches
Piston Pin Fit in Piston (Select Fit) -------------- .0000-.0003 Inches
Piston Pin Fit in Connecting Rod ----------------- .oooa-.oooa Inches
PISTON RINGS
Rings Per Piston --------------------------- (2 Compression-! Oil)
lst(Top)Compression-Cbrome, Taper Face. Relief Indicates Top Side
Side Clearance-------------- .002-.004 Inches
Width ---------------------- .093-.094 Inches
2nd Compression-Chrome, Relief Indicates Bottom Side
Side Clearance ------------ .0015-.0035 Inches
Width--------------- .093-.094 Inches
3rd Oil Ring----------------- Cast W/Ezpander
Side Clearance --------------.001-.003 Inches
Width-------------------- .1860-.1870 Inches
RingEnd Gap - When Installed in Bore -------------- .010-.020 Inches
Replacement RingWidth
·1st. Comp. ------- .0925-.0935 Inches
2nd. Comp. --------------- .0665-.0675 Inches
2nd. Comp. Rail----------.0235-.0245 Inches
3rd. Oil Rail------- .0235-.0245 Inches
3rd Oil Ring ---------------- .134-.135 Inches
CONNECTING RODS
Connecting Rod Length from Center of Pin Hole
To Center.of Bearing Journal------------- 5.560-5,562 Inches
Piston Pin Hole Diameter in Rod----------------- .8596-.8599 Inches
Inside Diameter of Rod Journal, Std. ------------ 1.5005-1.5010 Inches
Underslze -------------- 1,4905-1.4910 Inches
Connecting Rod to Crank Journal Clearance-------- .0005-.0015 Inches
Connecting Rod to Crank End Play Clearance------- .007-.016 Inches
CRANKSHAFT AND BEARINGS
Type 11,fain Bearings --------------------------- Ball Beartngs
Crankllhaft Rod Journal ------------------ 1.4995-1.5000 Inches
Crankshaft Rod Journal Width-------------------- 1.079-1.084 Inches
Crankshaft End Play ------------------------------ .003-.020 Inches
Measured at Bearing Plate and Shim to Proper End Play
CAMSHAFT
Camshaft End Play------------------------------- ,005-.010 Inches
Camshaft Pin Diameter --------------------------.4980-.4985 Inches
Camshaft Inside Diameter ----------------------- .4995-.5015 Inches
Camshaft Pin to Camshaft Clearance ---------------.001-.0035 Inches
Camshaft Pin to Breaker Cam Clearance----------- .001-.0025 Inches
VALVE LIFTERS
Valve Lifter Outside Diameter in Block----------- .6232-.6237 Inches
Valve Lifter Bore in Block -----------------------.6245-.6255 Inches
Valve Lifter to Block Clearance ------------------.0008-.0023 Inches
VALVES
Intake Valve Tappet Clearance (Cold) ----------------.008-.010 Inches
Exhaust Valve Tappet Clearance (Cold) --------------.017-.020 Inches
Angle of Valve Face - Intake and Exhaust ---------------- 44 Degrees
Valve Length - Intake and Exhaust--------------- 4.572-4.582 Inches
Max. Valve Face Runout - Intake ----------------------- .0015 Inches
Max. Valve Face Runout - Exhaust ---------------------- .003 Inches
Valve Head Diameter - Intake -------------------- 1.370-1.380 Inches
Valve Head Diameter - Exhaust------------------ 1.120-1.130 Inches
Valve stem Diameter - Intake -------------------- .3105-.3110 Inches
Valve stem Diameter - Exhaust ------------------ .3090-.3095 Inches
Intake Valve stem to Guide Clearance -------------- .001-.0025 Inches
Exhaust Valve Stem to Guide Clearance ------------ .0025-.004 Inches
VALVE SEATS
Seat Angle - Intake and Exhaust ------------------------- 45 Degrees
Max. Seat Runout - Intake and Exhaust ------------------- .002 Inches
Seat Width - Intake -------------------------------- .037-.045 Inches
Seat Width - Exhaust ------------------------------ .031-.062 Inches
Exhaust Seat Insert ----------------------------------- Replaceable
Outside Diameter of Exhaust Insert ------------- 1.2535-1.2545 Inches
Exhaust Insert Height----------------------------- .219-.221 Inches
VALVE GUIDES
Valve Guide Length ----------------------------------- 2.125 Inches
Valve Guide Outside Diameter --------------------.6260-.6265 Inches
Valve Guide to Block (Press Fit) ------------------ .0005-.002 Inches
Valve Guide Inside Diameter - Before Installing ----- .307-.308 Inches
Ream Valve Guides After Installing to ----------.312-.313 Inches
VALVE SPRINGS
Spring Free Length----------------------------------- 1.793 Inches
Spring Pressure When Comp. to 1.469 In. (Valve Closed)--27 to 31 Lbs.
Spring Pressure When Comp. to 1.165 In. (Valve Open) --- 54 to 62 lbs.
GOVERNOR
Governor stub Shaft Outside Diameter ------------- .3735-.3740 Inches
Governor Gear Bore for stub Shaft ----------------.3745-.3755 Inches
stub Shaft to Governor Gear Clearance ------------- •,0005-.002 Inches
Governor Spring Free Length With 2 Lbs. Pre-Load -------2.62 Inches
Governor Spring Extended to 2.88 Inches------------ 5.5 to 6.5 Pounds

Type --------------------------- Kohler, 1 Cylinder, 4 Stroke Cycle,
Air Cooled, "L" Head Engine
Bore ------------------------------------------------ 3.380 Inches
Stroke -----------------------------------------------3.250 Inches
Piston Displacement---------------------------- 29.07 Cubic Inches
Compression Ratio ----------------------------------------- 6 to 1
Max. Comp. at Cranking Speed
(Engine at Operating Temperature} --------110 to 120 PSI at Sea Level
Crankcase Vacuum(Engine Running}--- 5to 10 Inches Vacuum at Sea Level
Ignition --------------------------------12 Volt Coil, Breaker Points
CYLINDER BORE
Diameter of Cylinder Bore Std. A, B-------------3.3745-3.3785 Inches
.010 Oversize A, B + 10 --------------- 3.3845-3.3855 Inches
.020 Oversize A, B + 20 --------------- 3.3945-3.3955 Inches
.030 Oversize A, B + 30 --------------- 3.4045-3.4055 Inches
Cylinder Bore Must Be Bored or Honed Oversize If Taper or out of Round
Exceeds ------------------------------------------~005 Inches
PISTON AND PISTON PIN
Diameter of Std. Piston at Top ------------------- 3.356-3.360 Inches
Diameter of Std. Piston at Top of Skirt
(Measured Just Below Oil Ring) ------------------ 3.369-3.370 Inches
Diameter of Std. Piston at Bottom of Skirt --------- 3.371-3.372 Inches
Piston Pin --------------------------- Full Floating Type Retained In
Place With Two Retainer Rings.
Piston Pin Bore In Piston, Std. ------------------- .8752-.8754 Inches
Piston Pin Diameter Std. -------------------------.8752-.8754 Inches
.005 Oversize -------------------------- .8802-.8804 Inches
Piston Pin Length------------------------------- 2.735-2.750 Inches
Piston Pin Fit In Piston ----------------------- One Thumb Push Fit
Piston Pin Fit In Connecting Rod ------------------.0003-.0008 Inches
PISTON RINGS
Rings Per Piston ----------------------------(2 Compression-! Oil)
lst(Top)Compression-Chrome, Tapered Face. Relief Indicates Top Side.
Side Clearance -------------- .002-.004 Inches
Width--------------------------- .078 Inches
2nd - Compression -------- Chrome, Relief Indicates Bottom Side
Side Clearance -------------- .002-.004 Inches
Width--------------------------- .078 Inches
3rd - Oil Ring------------------------------ Cast W/Bxpander
Side Clearance -------------- .001-.003 Inches
Width-------------------------- .1870 Inches
Ring End Gap When Installed In Bore ---------------- .010-.020 Inches
Replacement Ring Width
1st Comp. ----------------- .077-.078 Inches
2nd Comp. ----------------- .077-.078 Inches
3rd Oil Rail-------------- .0235-.0245 Inches
3rd Oil Ring---------------- .134-.135 Inches
CONNECTING RODS
Connecting Rod Length From Center of Pin Hole
To Center of Bearing Journal ---------------------5.295-5.297 Inches
Piston Pin Hole Diameter In Rod----------------- .8757-.S7t30 Inches
Inside Di~meter of Rod Journal, Std. ------------ 1.5005-1.5010 Inches
Undersize ------ --------1.4905-1.4910 Inches
Connecting Rod To Crank Journal Clearance --------------.0005-.0015
Connecting Rod To Crank End Play Clearance -------- .007-.016 Inches
CRANKSHAFT AND BEARINGS
Type Main Bearings --------------------------------- Ball Bearings
Crankshaft Rod Journal ------------------------1.4995-l.5000 Inches
Crankshaft Rod Journal Width-------------------- 1.079-1.084 Inches
Crankshaft End Play ------------------------------ .003-.020 Inches
Measured at Bearing Plate and Shim to Proper End Play.
CAMSHAFT
Camshaft End Play -------------------··------------ .005-.010 Inches
Camshaft Pin Diameter --------------------------.4980-.4985 Inches
Camshaft Inside Diameter----------------------- .4995-.5015 Inches
Camshaft Pin to camshaft Clearance ---------------.001-.0035 Inches
Camshaft Pin to Breaker Cam Clearance ----------- .001-.0025 Inches
VALVE LIFTERS
Valve Lifter Outside Diameter In Block------------ .6232- .6237 Inches
Valve Lifter Bore In Block -----------------------.6245-.6255 Inches
Valve Lifter To Block Clearance -------------------.OU8-.UU23 Inches
VALVES
Intake Valve Tappet Clearance (Cold) ----------------.008-.010 Inches
Exhaust Valve Tappet Clearance (Cold! --------------.017-.020 Inches
Angle of Valve Face - Intake and Exhaust ---------------- 44 Degrees
Valve Length - Intake and Exhaust ---------------- 4.572-4.582 Inches
Max. Valve Face Runout - Intake ----------------------- .0015 Inches
Max. Valve Face Runout - Exhaust -----··-----------------.003 Inches
Valve Head Diameter - Intake ------------------- 1.370-1.380 Inches
valve Head Diameter - Exhaust ------------------ 1.120-1.130 Inches
Valve Stem Diameter - Intake -------------------- .3105-.3110 Inches
Valve stem Diameter - Exhaust------------------ .3090-.3095 Inches
Intake Valve stem to Guide Clearance -------------- .001-.0025 Inches
Exhaust Valve Stem to Guide Clearance ------------ .0025-.004 Inches
VALVE SEATS
Seat Angle - Intake and Exhaust -------------------------45 Degrees
Max. Seat Runout Intake and Exhaust ---------------------.002 Inches
Seat Width - Intake -------------------------------- .037-.045 Inches
seat Width - Exhaust------------------------------ .031-.062 Inches
Exhaust seat Insert ----------------------------------- Replaceable
Outside Diameter of Exhaust Insert ------------- 1.2535-1.2545 Inches
Exhaust Insert Height ------------------------------.219-.221 Inches
VALVE GUID&S
Valve Guide Length ----------------------------------- 2.125 Inches
Valve Guide Outside Diameter --------------------.6260-.6265 Inches
Valve Guide to Block (Press Fit ) ------------------ .0005- .002 Inches
Valve Guide Inside Diameter - Before Installing ------ .307-.308 Inches
Ream Valve Guides After Installing to -----------.312-.313 Inches
VALVE SPRINGS
Spring Free Length -----------------------------------1.793 Inches
Spring Pressure When Comp. to 1.469 In. (Valve Closed) -27 to 31 Lbs.
Spring Pressure When Comp. to 1.165 In. (Valve Qpen) ---54 to 62 Lbs.
GOVERNOR
Governor stub Shaft Outside Diameter ------------- .3735-.3740 Inches
Governor Gear Bore for stub Shaft ----------------.3745-.3755 Inches
stub Shaft to Governor Gear Clearance ------------- .0005-.002 Inches
Governor Spring Free Length with 2 Lb. Pre-Load -------- 2.62 Inches
Governor Spring Extended to 2.88 Inches ------------ 5.5 to 6.5 Inches

GENERAL TORQUE SPECIFICATION TABLE (Revised 5-64)
USE
THE FOLLOWING TORQUESWHEN
SPECIAL
TORQUESARE
NOT
GIVEN
NOTE: These values apply to fasteners as received from supplier, dry, or when
lubricated with normal engine oil. They do not apply if special graphited
or moly-disulphide greases or other extreme pressure lubricants are
used. This applies to both UNF and UNC threads.
SAEGrade No. 5 8*
Bolt head identification 0 0 ©
0 @ ©
marksas per
grade
Note: Manufacturing
\
Marks Will
Vary
Torque Foot Pounds Torque Foot Pounds
Bolt Size Min. Max. Min. Max.
1/4" 9
11
12 15
5/16 15 18 24 28
3/8 35 40 45 50
7/16 54 60 70
80
1/2 80 90 110 125
9/16 110 120 160 180
518
150 165 220 240
3/4 260 280
380
420
718
360 400 600 660
1" 540 600 900 1000
1-1/8 720 800 1280 1440
1-1/4 1000 1100 1800 2000
1-3/8 1460 1680 2380 2720
1-1/2 1940 2200 3160 3560
* Thick nuts must be used with Grade 8 bolts
GENERAL ENGINE TORQUE SPECIFICATION TABLE
Torque Jnch Pounds Torque Foot
Pounds
Thread Size UNC UNF UNC UNF
Bolt Size
1/4" 70 85
5/16 150 165
J/8
22 25
7/16
35 45
1/2 so 70
SPECIAL ENGINE TORQUE SPECIFICATIONS
Cylinder Head Bolts* -------------------------- Torque to 33 Ft. Lbs., Loosen, Retorque
to 35 Ft. Lbs.
Connecting Rod Bolt>J<------------------------------------------- Torque to 25 Ft. Lbs.
Flywheel Nut -------------------------------------------------- Torque to 100 Ft. Lbs.
Spark Plug -------------------------------------------------- Torque to 27 Ft. Lbs.
*Lubricate With Greasp Upon Assembly
NOTE: The J
I
Case Company reserves the right to make im-
provements in deaign or changes in apecifications at any
time without incurring any obligation to install them on
units pnvioualy
801d.

Ra c. Form 9-77701
SECTION
F
ELECTRICALSYSTEM
THECHARGINGCIRCUIT
-
THESTARTINGCIRCUIT
-
IGNITION SYSTEM

INTRODUCTION
BATTERIES ...
TABLE OF CONTENTS
SOLENOID SWITCH AND STARTER-GENERATOR
REGULATOR ....
IGNITION TIMING
IGNITION COIL AND CONDENSER
CONTACT POINTS AND COIL POLARITY
SPARK PLUGS
INTRODUCTION
F-2
, · · • F-2 thru F-4
· · F- 5 thru F-6
F-7
F-8
F-8
F-9 thru F-10
-F-11 thru F-14
Section F contains the specifications and wiring diagrams necessary to diagnose and make
minor adjustments on the electrical components on the garden tractors.
All major adjustments and overhaul of electrical components should be performed by an
Authorized Electric.al Service Station (Delco- United Motors Service) where specialized. equip-
ment and trained personnel are available.
DO NOT ATTEMPT EVEN MINOR ELECTRICAL ADJUSTMENTS WITHOUT THE AID OF
PROPER TEST EQUIPMENT
BATTERY SERVICE AND INSPECTION
/#/IORTA/ITworkingwith storage batteries all exposed metal surfaces are "live". Never
lay a metal object on top of a battery as a short circuit may result. Sparks or open flame must
be kept away from batteries due to the presence of explosive gas in and around the batteries
while they are being charged or in use.
The ~mlfuric acid or electrolyte present in a battery is very harmful to your eyes, skin and
clothing. If contact is made with it, wash it with a weak solution of baking soda and water. This
will neutralize the acid.
Visual Inspection
Check the battery terminals and cables for dirty or corroded conditions which will cause
high resistance, resulting in undercharged batteries and very poor cranking speed.
The battery tray, hold own terminals and cable ends must be cleaned when contaminated, use
baking soda and water. This will help to prevent self discharge of batteries. After cleaning and
drying ,a thin coating of vaseline, light cup grease or paint will help prevent contamination.
A cracked or leaking battery case will let the electrolyte leak out and cause damage to the
equipment, a battery in this condition should be replaced. When just the top sealing compound
is leaking the battery can be resealed.
Vent holes in the filler caps should always be kept open to let the battery gases es cape. Never
remove battery caps except to add water.
The electrolyte level should be checked each week. Never let the level drop to a point where
the plates are exposed. Pure or distilled water should only be added when the electrolyte level
is low. DO NOT OVERFILL, refer to Figure F-1.
Normal water consumption would be approximately 1 oz. every 25 hours or weekly. If it is
greater, either the case is leaking or regulator is overcharging and must be adjusted.
F-2

Specific Gravity Check
The most reliable way to determine the
concentration of sulfuric acid in the elec-
trolyte is to measure the relative weight or
specific gravity of the solution. A hydrom-
eter is used for this, and only enough solu-
tion is removed from a battery cell so the
float is suspended freely and not touching
the top, bottom or sides of the glass tube,
Figure F-2. Always hold the hydrometer at
eye level and in vertical position when taking
a reading. Ahydrometer reading is only cor-
rect when the temperature of the solution is
80° F.
/IOTl l\fost hydrometers have a calibrated
thermometer to correct this.
When it is above or below this reading, it
has to be corrected either by adding .004
gravity points for every 10° above 80°F. or
subtracting .004 gravity points for every 10°
below 80° F., Figure F-3.
\\:hen the specific gravity readings be-
tween the cells show a variation of .025, the
battery should be replaced.
Specific gravity readings will change de-
pending upon climate.
State Specific Gravity Range for
of Climate Zone
Charg-e Fri!!id Temperate Tropical
100% 1.280 1.260 1.225
75% 1.230 1.215 1.180
50% 1.180 1.170 1.135
Discharged 1.080 1.070 1.045
The battery should never be allowed to
drop below 75% charge while not in use.
\\'hen a battery is to be charged, it may be
charged at any rate which does not allow the
battery terminal voltage to exceed 15. 5 volts
(12 volt battery) while charging. The battery
temperature should never exceed 1l0°F.
while charging, if it does reduce charging
rate.
The charger should be left on until the
specific gravity readings stay the same after
three checks of an hour apart.
A fast charge method is used only to give
the batteries a boost for starting. This type
of charge puts out a very high amper age un -
til the battery temperature is up to 1l0°F.,
then it shuts off.
F-3
7
Figure F-1
HOLD HYDROMETER
VERTICALLY STRAIGHT
/
---,-
TAKE READING
AT EYE LEVEL
FLOAT MUST
BE FREE
Figure F-2
TEMPERATURE IN 160
Of OF El ECTROLYTE150 +32 GRAVITY POINTS
+28 TO ADD OR
+ 24 SUBTRACT
+20 FROM READING
0
- 12
-16
-20
- 24
- 28
- 32
Figure F-3

Individual Battery Cell Check
Place a light load on the battery by crank-
ing engine (do not start engine) for 3 seconds.
Turn on headlights, after one minute proceed
with check. Using a 4 volt voltmeter check
the voltage of each cell, refer to Figure F-4.
If
cell voltage varies more than .05 vol ts
replace battery.
If
cell voltage is below 1. 95
volts, charge battery and recheck the cell
voltages. If cell voltage is still below 1.95
volts or varies .05 volts replace battery.
Battery Cranking Voltage Test
To perform the cranking voltage check;
NOTE
On Spark Ignition engines remove
the center coil wire to prevent engine
from starting
1. Connect a volt meter (12 volt) between the
positive and negative terminals of the bat-
tery, Figure F-5.
Crank the engine for 15 seconds and re-
cord voltage.
2. Connect voltmeter (12 volt) between the
starter generator" A" terminal and ground
on starter generator frame, Figure F-5.
Crank the engine and record voltage.
If
voltage is not the same or varies more
than .5 volt, check the battery cables,
clean and tighten connections.
Battery Bench Load Test
When battery is removed from the trac-
tor, connect a volt meter (12 volt) between
the negative and positive post, Figure F-6.
A
load equal to
3
times the amp hour rating
of the battery should be connected between
the positive and negative posts and after 15
seconds, check the volt meter reading.
If
it is less than 9.5 volts (12 volt battery)
the battery should be replaced.
F-4
BATTERY
+
VOLTMETER
Figure F-4
SOLENOID
SWITCH
Figure F-5
VOLTMETER
Figure F-6
VOLTMETER
c:::J
CARBON BANK
RESISTOR
BATTERY

SOLENOID SWITCH CHECK AND SPECIFICATIONS
Delco-Remy Case Amperage Draw
:-.Jo. No. both windings
1498 A21-±81 2.1 - 2.3
Specifications given at temperature of 80JF.
l\Iake hook up, Figure F- 7 and slo,vly
decrease the load vvith the variable resistor
until the specified voltmeter reading is ob-
tained. The A.mmeter at this time should show
specified amperage draw of both windings. A
noticeable click (closing of the switch con-
t.lets) will be heard when this specified volt-
age and amperage is reached.
If
solenoid
switch does not meet these specifications, it
must be replaced with a ne,v switch.
Voltage Dr aw
both windings
8
VARIABLE
RESISTOR
AMMETER
BATTERY
VOLTMETER
+
Figure F-7
SOLENOID
SWITCH
STARTER-GENERATOR CHECKS AND SPECIFICATIONS
Delco Case Brush No Load Test
Remy No. Tension Volts Av. Max. RPM
1\0, Amps, Amps, Min.
1101970 A70202 24-32 11 12
18
2500
Delco Case Field Current
Remy No. Draw at 80° F. Cold Output at 80" F.
No. Amps. !Volts Amps. I Volts 1RPM
1101970 A70202 1.52-1.62 I 12 12 I 14 14950
STARTER NO LOAD TEST
AMMETER
Max.
2900
VARIABLE
RESISTOR VOLTMETER
For the no load test, connect the starter-
generator in series with a 12 volt battery,
300 amp. ammeter, a variable resistor
connected to the "A" terminal. Ground the
"F" terminal, Figure F-8. With the starter
running, check the RPM with a tachometer.
Check the current draw and voltage draw.
They should meet the specifications listed
above.
If
the starter-generator does not
meet these specifications, it must be ser-
viced or replaced.
F-5
BATTERY
+
TACHOMETER
c::;
Figure F-8

GENERATOR OUT-PUT CHECK
The output test can be made on the
tractor using the engine to drive the unit.
Wh2n test is made on the bench, some means
of driving the unit will be necessary. Be
sure the drive belt is adjusted properly.
Disconnect all cables and wires to generator.
Connect ammeter and variable resistance in
series between the "A" terminal and gener-
ator frame. Connect voltmeter from the" A"
terminal to the frame. Install jumper lead
from the "F"terminal to the frame, Figure
F-9.
Drive the unit at specified RPM, adjust
to specified voltage by varying the resis-
tance. When the ammeter reading is lower
than specified amperage, the unit must be
serviced or replaced.
If
amperage output is
too high, disconnect the jumper lead from the
field "F" terminal.
If
ammeter reading is
still high, unit will have to be serviced.
TACHOMETER
VARIABLE
RESISTOR
Figure F-9
VOLTMETER
STARTER-GENERATOR DRIVE BELT ADJUSTMENT
The starter - generator drive belt should
be checked for excessive looseness and
wear after the first 10 hours of operation
and each
25
hours of operation thereafter.
The belt tension is correct when the belt can
be depressed 1/ 4" (finger pressure) bet-
ween the pulleys, Figure F-10.
IMPOINANT
Under no circumstances should a pry bar
be used on the starter - generator to obtain
belt tension, as damage to the bearings could
result.
F-6
I
CRANKSHAFT
PULLEY
STARTER- GENERATOR PULLEY
"
1/4" DEFLECTION
Figure F-10