Allis-Chalmers HD-9 User manual

SERVICE MANU L
FOR
DEL HD9 TRACT R
1955
PROPERTY OF
LITHO. !N U.S.A.
3

FOREWORD
"
TMis manual is prepared to provide the customer and the maintenance
personnel with complete information
and instructions on the mainte-
nance of the Model "HD-9B" Tractor (standard model). Extreme care
has been exercised in the designing, selection of materials, and the
building of the tractor. By
proper maintenance and skillful operation
of the tractor, the utmost satisfaction in performance and service will
be obtained.
In order to become familiar with the various parts of the tractor, it is
urged that the mechanic study the instructions in this manual and use
it as a reference when performing repair or maintenance operations.
All information
and photographs shown throughout this manual are of
the "Standard" Model "HD-9B" Tractor, unless otherwise stated.
Sections I through
XIX of this manual contain a detailed description
of the various assemblies of the tractor and instructions for the proper
adjustment and repair or rebuilding of these assemblies.
Section
XX describes the Special Equipment available for the tractor
and outlines the service of these parts.
General Maintenance Instructions are given in Section XXI, and Fits
and Tolerances in Section XXI/.
Trouble Shooting Information given in Section XXIII will aid in deter-
mining the cause of operating irregularities and tells what may be
done to correct them. General information on the availability of
Special Tools is given in Se.ction XXIV.
To assure the best results and to maintain the original quality built
into
the tractor, it is important that Genuine" Allis-Chalmers" Parts be
used when new parts are required. IMPORTANT: ALWAYS FURNISH
THE DEALER WITH BOTH THE TRACTOR AND ENGINE SERIAL
NUMBERS WHEN ORDERING, pARTS.
Many owners of "Allis-Cha/~Jii.s" equipment employ the Dealer's
Service Department for all work other than routine care and adjust-
ments. This practice is encouraged as our dealers are kept well informed
by the factory regarding advanced methods of servicing "Allis-
Chalmers" products and are equipped to render satisfactory service.
4

SUBJECT INDEX
SUBJECT
PAGE SECTIOlli
Description and Specifications 1
Engine Fuel System
15
Engine Air Intake System
43
Engine Cooling System 68
Engine lubricating System
81
Engine Controls and Governor
94
Electrical System 104
Instruments 112
Engine 115
Engine Clutch and Clutch Brake 174
Transmission and Bevel Gear 187
Steering Clutches and Controls 208
Steering Brakes 219
Final Drives 224
Truck Frames 241
Draw Bar 259
Tracks
261
Main Frame and Equalizer Spring 266
Fender and Seat Group 270
Special Equipment 272
General Maintenance Instructions 282
Fits and Tolerances 287
Trouble Shooting 295
Special Tools 313
.(~
5

SECTION I-DESCRIPTION AND SPECIFICATIONS
Topic Title Topic No.
General Description
............... 1
General Specifications ............. 2
Specifications of lubricants
.. . . . . . . . . 3
Specifications of Fuel .............. 4
Fuel Storage ..................... 5
Tractor and Engine Serial Numbers. . . 6
1. GENERAL DESCRIPTION
The description given herein and the information
contained in this manual pertains to ~he Model
"HD-98" Tractor (Standard Model), unless other-
wise stated.
The Model "HD-9B" Tractor
is on 18,800 pound
track-type tractor powered with a 4-cylinder,
2-
cycle "DIESEL" Engine. Power from the engine is
transmitted through a single plate, over-center type
engine clutch to the transmission through a drive
shaft universal joint assembly.
From the trans-
mission, the power is transmitted to the bevel gear,
and from the bevel gear through two multiple disc
steering clutches (one on
each side of the bevel
gear shaft) to the final drives and the track drive
sprockets.
The transmission provides 6 forward speeds rang-
ing from 1.4 M.P.H. in low gear to 5.7 M.P.H.
6
in high gear and 3 reverse speeds ranging from
1.6
M.P.H. in low reverse to 4.4 M.P.H. in high
reverse, under
full governed engine speed of
1600 R.P.M.
Mechanical "Booster-Type" steering clutch Con-
trols, mechanical self energizing brakes, adjustable
and wide operator's seat, and unobstructed view
of the front of both tracks assure easy, positive
control of the trador at all times.
The tractor
is equipped with electric starting and
lighting equipment, muffler, full width crankcase
guard, front pull hook, bumper, hinged type radi-
ator grille, suction type fan, and 16-inch integral
grouser shoes.
The truck wheels, track idlers, and
support rollers have positive type seals and are
protected by guards.

BACK
TRUCK WHEEL OUTER
TRACK SUPPORT
EXHAUST STACK
AIR PRE-CLEANER ~
~ 'RADIATOR CAP
/ HEADLIGHTS
RAI)IArOR GRillE
HOOK
GUARD
L ______________ Fig. I-Model HD-9B Tracfor ______________ .....J
7

8

2. GENERAl. SPECIFICATIONS
(STANDARD TRACTOR)
GENERAL SPECIFICATIONS:
Overall length , .• ' .•. ' ... , ........ "., .. , .......•. ',." .. " .... , ... ,., ........ ,." .. " .... 12 ft. 6 in.
Overall Height (without ,tacks) ., .•......... " .... , •.... ".,' ..... , •.. ,., .... " ........... ," 6 ft. 11> in.
Overall Width (standard ,hoe,) ........................... " ................. " ......... 7 ft. 11-1/16 in.
Turning Radius .. , .... , .... , ............•....... , ........ , ......•..... , .... , ......... , ..... 8 ft. 7% in.
Ground Clearance ..•...•.......................... ,., ... , ............ , .. , ................. 13-5(16 in.
Drowbor Height (center line of jaw)
.,.' .. " ..... ,",., .... , ..... ,' ... ,.' ........ ' .... ,.,.',. 16-17/32 in.
Lateral Drawbar Movement .•... , .•............... , .•. " .....•.. , ....••..•.............•...•.•.. 26% in.
Shipping Weight (approximate) ..•.. , ...... , .... " .. ,.'.', ...... ,.,." .......... ', .. , ... " ... 1 a,BOO Ib,.
length of Track on Ground " •....•.. ,"', ..... , ...• " .. , .. " ........ ,.,., •.... , ..... ", ... 7 ft. 1% in.
Width of
Standard Track Shoes .••.... ""' ............ , .. , .. ,., •..... " .. ', ... , ...... ,' ........ ,' 16 in,
Maximum Width Track Shoes Available
.. ., , , , , ........ ., , , . , , .... , , ..... ,., . , . , ........... , ....... 22 in.
Ground Contact Area
(standard ,hoe,) ... " .. "., ... " ... " .. " .............. " ........ ., .... 2744 sq. in.
Number of Track Shoes
per Track ... " , "" .. , , .. , , . , , , " ., ... , ' .... , ....... ., , ... , ......... , , .. , .. , .3B
Ground Pressure
per Sq. In. (standard shoes) ....• "',., .. " •.. ,., ... , •....•.... ,.,., .... ,, ....• ' ,6.B5 Ibs,
Tread width (center.to~center of tracks) ...... , ...•........ , .... ,', ......... , ....•.............. ," ,74 in.
TRACTOR SPEEDS (at Rated Engine Speed):
GEAR RANGE
SPEED
lst Gear .. , .... , ... , ....... ,.,"", ....... ,',., ... , .... , .............. , .. , .. " •... , .... , .. 1.4 M.P,H.
2nd Gear.,., , . , . , .. , , ......•.. , ' . , , , ......... ' ..... , .... , .. , , .. , ......... , . ,. , . , .•. , . , .... 2.1 M,P,H.
3rd Gear •...•.. "." ... ,., ...... ,., ..... , ..... , ... , ...... ,."" ........... , ... ", ......... 2,9 M.P,H,
4th Gear ••.... , ... ,.,"', ...... ,.,."." .... ,.,.,"', ......... ,." .........••. ,." .. " ..•. 3.8 M.P.H.
5th Gear ............. ,',., .... ,." ... , .. , .......... " .... ,., ... ,., ... ,", ... ,',.,",." ••. 4.4 M.P.H.
6th Gear" .......... ,',." ....... ,.".,', .. , ....... ,", ........... , ... , .. , .... , ...... ,', .. 5.7 M.P.H.
1st Reverse,.,., .... , .. ,.", ... , ....... " ... "" ...... ,.,." ..... ,.,." ............ """ .. 1.6 M.P.H.
2nd Reverse
............ "" ................ , ................. ", ......... " ........... ,., .. 3.5 M.P.H.
3rd Reverse., ........... , .... ", ........ , .... "., ......... , ... ",., ....... " ..... , ..... " .. 4.4 M.P,H.
ENGINE:
Make •. , .......• ,., ..•.......•.....•..•.•••.• , .......•.. , .•.........••... ', ••• IIGeneral MotorsN Diesel
;:Y~;b~;~i Cyii~d~~; '.''-.'.'.'.'.'.'.'.'.':.'.' . .'.'.'.''.'''-' '-:::.' . .'.' ::.'.'.-.'.-.-::::.'.':.-:::.'.-.': .. " ::.:.:::.' .'.".r~aCy~l:
Bore ...• , ...•.•......... , ......••••. ,',.,., .... , .••.•..•......•. ,., ••...•...•••• , •....•...... 41;,1 in.
Stroke .•••..•.. , ........••.... "." .. , ...•••.. , ... ,', .•. " .. ""' ••...•...... " .. ,., •• ,"' ..... ,,' 5 in.
Piston Displacement ... ,., ....... " ... " ................ , ... , .• " ................... ,', ..... , 2B4 cu. in.
Engine Speed (governed at full lood) ....... ,' ...• ,', ..... , .......• , .. ,', ....• ," .. ,.", .... ,1600 R,P,M.
lubrication ., ....... , ...... "., ............ ,., ... ,.,., •.... ,', ....... ,,'., ... ,., ...... , ... Forced Feed
Foel Used .. , ......... " .. , ... , ........ ,., ........ .", ..... ' .... ., .. ,., ... ,., No. 1 or No. 2 Die,el Fuel
Fuel Supptied by .. " ...............•..•.. " ........ " ...... ,., ....•..• ,.,"' ... 55 cu. mm. Unit Injectors
CAPACITIES (Approximate) (U. S. Standard Measure):
Cooling System ... ,',', ..... ,., ... '., .. , ..... ,'.'.,.,', .... ,"." ........ " ...... ,', .....•... 7Y.i Gal"
Crankcase
and Filter ., ....•......... , .. ,.,',., .. ', ...........•. ,', ....... , , , . , .. " .......... , .. ,4 Gals.
Transmission
Case, .... , .' ........... , ................. , .. , . , . , ........ , , , , , , ..•.. , ...... , , , . ,6JA Gals.
Finol Drives (each)
.. , .... ,.,.," ...... ,.,', .. " .... ,', .. , ... , ........... ,,',., .. ,', .. ,' .. , ,.3v.. Gals.
fuel Tank
.', .. ,., .. , ...... ,., ..... ,.,"'" ......•..... '." ..... , "', ... , ..... , .. ".,',., ... 55 Gols.
Track Release Housing (each) •.. ,.,.,., .......... ,', ••. , .....•. ,.,., .•....... "', •.. ,,., ... , ... ,2 Gals.
Air Cleaner ... ,', .......... ',., ..... ,.,., ... " .. '" ... ', .... , ............. ,., ", .. ,.""., .. 1 Gol.
The Allis-Chalmers Manufacturing Company reserves the right to make changes in the
above specifications
or to add improvements at any time without notice or obligation.
9

3. SPECIFICATIONS OF LUBRICANTS
A. Engine Crankcase Lubricant
USE NON-CORROSIVE "DIESEL" ENGINE WBRI-
CATING OIL CONTAINING ADDITIVES WHICH
WILL PREVENT SWDGE OR GUM DEPOSITS_
UNDER NO CIRCUMSTANCES SHOULD A COR-
ROSIVE "DIESEL" ENGINE LUBRICATING OIL
EVER BE USED.
Use oils of the following viscosities,
Atmospheric
Temperature
Viscosity
Above 32° F.
Use SAE 30
0°
F. to 320 F.
Use SAE 20W
0°
F. and below
Use SAE lOW
Manufacturers of lubricants recognize the impor-
tance of the qualities required for use in our equip-
ment and they are cooperating fully to assure the
use of only those oils which
fulfill these require-
ments. The oil distributor and oil manufacturer are
to be held responsible for the results obtained from
their products.
The outstanding lubricating requirements for effi-
cient operation of the engine are, The maintaining
of piston rings
in a clean, free condition; absence
of hard carbon
and "varnish" deposits on or within
engine ports; the prevention of bearing corrosion;
and the promotion of general cleanliness within
the engine.
Proper operation and maintenance of the engine
are necessary to obtain the desired results from
the lubricating oil.
B. Transmission and Final Drive Lubricant
Lubricate these assemblies with any good grade
10
of engine lubricating oil purchased from a reputa-
ble oil company.
Use oils of the following viscosities:
Atmospheric
Temperature
Viscosity
Above 32° F.
Use SAE 50
320 F. and below Use SAE 30
C. Track Release Housing Lubricant
Lubricate these assemblies with SAE 50 engine
lubricating
oil in all seasons.
D. Truck Wheel, Track Idler, and Track
Support Roller Lubricant
Lubricate these assemblies with a grease that has
been tested and found satisfactory for use by the
Allis-Chalmers Manufacturing Company. A revised
list of approved greases is issued every six months.
Ask your nearest "Allis-Chalmers" authorized
Dealer for the latest
list.
E. Pressure Gun Lubricant
Use a ball and roller bearing lubricant with a
minimum melting point of 300° F. This lubricant
should have a viscosity range
so as to assure easy
handling in the pressure gun at the prevailing
atmospheric temperature.
This lubricant must be
waterproof.
f. Air Cleaner
Use the same viscosity oil in the air cleaner as used
in the engine. CAUTION: Do not use on oil that
foams.

4. SPECIFICATIONS OF FUEL
Use a No. 1 "DIESEL" Fuel purchased from a
reputable oil company. In warm weather No.2
"DIESEL" Fuel may be used. This fuel must be
within the classification limits as established
by the
American Society for Testing Material, Tentative
"DIESEL" Fuel Oil Specifications (ASTM 0975).
For longer engine life and performance, fuel re-
quirements mus~ comply with four basic qualifi-
cations:
I. Physical cleanliness.
2. Absence of chemical contamination.
3. Proper burning characteristics.
4. Cold starting ability.
Physical cleanliness means freedom from water,
dirt,
and other incombustible ingredients. Since
all present day high speed "DIESEL" fuels are com-
pletely distilled, they leave the refinery in clean
condition.
The most objectionable chemical contaminants
are
free sulphur and gum, which, even in relatively
small quantities
are largely responsible for harm-
ful internal engine deposits. The fuel must also be
11
free from alkali and mineral acids.
Proper burning characteristics are dependent upon
ignition quality
and volatility.
All fuels meeting the requirements of the No. 1-0
and also the lighter types of fuel in the No. 2-D
grade of ASTM-D975 "DIESEL" Fuel Oil Specifica-
tions are satisfactory. The more volatile grade
(ASTM No. I-D) is recommended for all types of
service where frequent speed
and load changes
occur, while fuels in the heavier grade (ASTM No.
2-D) may be used with sustained high loads.
Prolonged use of fuels combining low ignition
quality (less than
45 Cetane Number) with high
boiling temperature (more than 6750
F. end paint)
should be avoided, particularly
in cold weather.
CAUTION, The sulphur content of "DIESEL" fuel
should be
as low as possible. For warm weather
conditions, the fuel should contain not more than
V. of 1% sulphur. For cold weather operation, fuel
with not more than 3/10 of 1% sulphur is
preferable.

5. FUEL STORAGE
The importance of proper storage of fuel cannol
be too strongly stressed. Storage tanks, drums, or
service tanks must
be free from rust, scale, sedi-
ment, or any other foreign molter which will
contaminate the fuel. Dirty fuel will clog the fuel
filters
and eventuolly damage the fuel pump and
injectors.
A portable storage tank provides the best method
for storing fuel on the job.
In a storage tank, the
sediment
and water can easily be drained and the
fuel can be pumped into the tractor fuel tank with
a minimum of handling. Consult your nearest"Allis-
Chalmers" Dealer for details
about this type of
storage tank. Since condensation will occur in the
storage tank,
it is very important that a sediment
sump be provided
50 that water and se'ltlings ccm
be drained daily.
Fuel should be allowed to settle at least 48 hours
in the storage container before it is added to the
fuel tank of the tractor.
It is advisable to use a
pump and draw the fuel from the container rather
than to drain
it from the bollom of the container.
Where conditions
are such that drums must be used
to supply fuel,
it is advisable to have enough drums
to allow sufficient time for the fuel to sellie. The
fuel should be used only to within about three
(3)
inches from the bottom of the drums. The fuel thus
left
in a number of drums can be collected into
one drum
and used after the usual time allowed
for settling.
In this manner, the sediment and for-
eign matter
will be disposed of and no fuel will be
wasted. Whenever drums
are used for fuel storage,
they should be covered or placed under shelter to
avoid contamination of the fuel by water, which
will enter through the filler plugs when it rains,
even though the plugs are tight.
The fuel tank of the tractor should
be filled at the
end of the day's run rather than at the start; this
will reduce the water content, as a full lank is
less subject to condensation. The tractor fuel tank
is provided with a drain elbow and drain cock, for
draining accumulated
waler and sediment.
L- _______________ Fig. 3 Fuel Storage Tonk -------- ______ ---J
12

6. TRACTOR AND ENGINE SERIAL NUMBER.S
On all parts orders and in all correspondence rela-
tive to the tractor, it is necessary that both the
tractor and engine serial numbers be given. This
will properly identify the particular machine and
will assure obtaining the correct replacement parts
for it.
The tractor serial number is stamped in the rear
13
face of the steering clutch housing (near the upper
right corner)
and is also stamped on a serial
number plate attached to the cowl.
The engine serial number is stamped on the upper
right side of the cylinder block, below the governor
control housing.

14

SECTION II-ENGINE FUEL SYSTEM
Topic Title
Description
of System ............ . Topic No. 1
Checking Fuel Supply System ...... . 2
Fuel Tank and Drain Elbow ........ . 3
Fuel Filters . . . . . . . . . . . . . . . . . . . . . . .. 4
Fuel Pump. . . . . . . . . . . . .. . . . .. . .. 5
Fuel Injectors ................... 6
Injector Copper Tubes. . . . . . . . . . . . . 7
Fuel Manifolds . . . . . . . . . . . . . . . . . . . 8
1. DESCRIPTION OF SYSTEM
The engine fuel system consists of the fuel tank,
first stage fuel filter, fuel pump, second stage fuel
filter, injectors, fuel lines, and fuel pressure gage.
The fuel is drawn from the bottom of the fuel tank
and through the first stage fuel filter by the fuel
pump.
The pump then circulates the fuel under
pressure through
the second'stage fuel filter, fuel
inlet monifold
on the right side of the cylinder
head, and then through the injectors. As the fuel
enters each injector, it passes through a small
porous metal filter
in the injector body. The amount
of fuel required by the engine
is injected into the
cylinders by the injectors; surplus fuel, not required
for combustion, leaves eoch injector through an-
other porous metal filter, enters the return fuel
manifold and
is returned to the fuel tank. A pres-
sure of
20 to 55 pounds is maintained within the
fuel system by a restricted fitting located
in the
rear of the return fuel manifold. The continuous
circulation of fuel helps to cool the injectors
and
eliminates the possibility of air pockets in the fuel
system.
INJECTOR FUEl LINES
RETURN FUEL MANIFOLD
FUEl TANK
DRAIN COCK
~~,
."
...
"
;:
"
"
"
"
"
"
"
"
.,
RETURN TO TANK
~::::==~=:9
FUEl TANK SHUT.OFF VALVE
INJECTORS
O--o-O~o
2nd STAGE FUEL FILTER
\ ( \
INLET FUEL MANIFOLD
u
ht STAGE FUEL FILTER
'--- ____________ fig. I-Schematic ruel Flow Diagram ____________ ----'
15

2. CHECKING FUEL SUPPI.Y SYSTEM
A. General
Under normal conditions, with the engine running
at full throttle, 20 to 55 pounds pressure will be
indicated on the fuel pressure gage. Fuel pressure
below normal, uneven running of the engine, ex-
cessive vibration, stalling when idling, and a loss
of power
are indications of insufficient fuel supply
to the injectors. To determine the cause for the
above conditions, check for the following:
1. Air being
drawn into fuel system on the suc-
tion side of
the fuel pump.
2.
Clogged fuel filter elements and fuel lines.
3. Clogged injector fuel filters.
4. Inoperative fuel pump.
B. Check for Full Flow of Fuel
Through System
To check the flow of fuel through the system, dis-
connect the fuel return line at the fuel tank. With
the engine operating at high idle, the system will
be functioning properly when a full stream of fuel
with considerable pressure can
be observed re-
turning to the fuel tank through the return fuel
line.
If only a small stream is observed returning
to the tank, all causes listed
above must be checked
and eliminated in turn.
C. Check for Admission of Air into
System, Clogged Fuel Filter Elements,
and Clogged Fuel Lines
To check for air being admitted into the system,
follow
the same procedure as used in checking
for flow of fuel. If air is entering into fuel system,
foam or bubbles will be observed in the fuel that
emerges from the loosened connection. Correct
this condition
by tightening any loose fuel lines
and filter connections between the fuel tank and
the fuel pump. Start the engine and test for smooth
operation and full flow of fuel.
If the fuel lines or filters are clogged, clean the
first stage or second stage fuel filter, or both, in-
stall new elements, and blowout the lines while
they are disconnected. This should eliminate the
difficulty. Check for full flow of fuel after engine
is again started.
16
D. Check for Clogged Fuel
Iniector Filters
If the engine still runs "ragged" with suitable fuel
return,
the injector filters for one or more of the
cylinders may be partially clogged. Locate the
faulty injector as follows:
Run the engine at low idle speed and cut out each
injector in turn by holding the injector follower
down with a screwdriver or small block of
wood.
CAUTION: Do not allow the screwdriver to slip
off the iniector follower as damage to the valve
assemblies can easily result. A
decrease in engine
speed with the injector follower held down will
indicate that the injector for that cylinder is func-
tioning properly. If engine speed does not de-
crease, the injector is inoperative and should be
removed for further inspection. To determine
whether or not the faulty injector is obtaining suf-
ficient fuel, stop
the engine and remove the fuel
line
that connects the injector to the return fuel
manifold. Hold a finger over the injector fuel out-
let and crank the engine with the starter. If fuel
gushes from
the injector fuel outlet while the starter
is cranking the engine, an ample fuel supply is
indicated.
illlliilllliilllliilllli'" INJECTOR FOlLOWER
'- __ -'I Fig. 2 - Locating Faulty Injector ___ -'

E. Check for inoperative Fuel Pump
Assuming that there is a sufficient supply of fuel
in the fuel tonk, and that fuel is reaching the fuel
pump, loosen the vent screw located in the top of
the second stage fuel fliter.
The fuel should gush
from the vent screw opening
in the filter with the
engine running
at low idle. If fuel does not gush
from this opening, the fuel pump
will be consid-
ered inoperative and must be repaired or replaced.
F. Excessively High Fuel Pressure
A relief valve is installed in the fuel pump to pre-
vent high fuel pressure.
If the relief valve sticks,
high pressure will develop and will be indicated
on the fuel pressure gage. When this occurs, the
valve
in the fuel pump should be inspected and
the couse determined for
its sticking. The second
stage fuel filter, the restricted fitting installed
in
the rear of the return fuel manifold, and all the
fuel lines should
be inspected for clogged
passages.
Continued operation with excessively high pressure
(over 55 pounds) may result
in damage to the fuel
system.
3. FUEL TANK AND DRAIN ELBOW
A. Description
The fuel tonk, located at the rear of the tractor,
has a capacity of approximately
55 gallons. The
drain elbow at the bottom of the fuel tonk provides
a means for draining the tonk when flushing and
also acts
as a sediment sump. Open the drain cock
in this elbow before the engine is storied at the
beginning of the day's operation
in worm weather
or shortly after the end of the day's operation
in
freezing weather; close the drain cock when clean
fuel runs out. Drain
and flush the fuel tonk if a
large accumulation of rust
and scale is evident.
B. Maintenance
If a large accumulation of rust or scale in the fuel
tank becomes apparent, remove the drain plug
from the fuel tank drain elbow, disconnect the fuel
lines from the fuel tank,
and flush the tank with
17
clean fuel or clean the tank with live steam. This
will prevent frequent clogging of the fuel filters
and will eliminate possible trouble in the fuel
system.
C. Removal
1. Remove the seat cushion. Remove the side
cushion from the top of each battery box.
Remove the bolt attaching each battery box
to the front of the fuel tank (one bolt on
each side).
2. Remove the capscrew ollaching the battery
cable supporting clip to the fuel tank.
3. Close the fuel tank shut-off valve located
at
the lower front side of the fuel tank. Discon-
nect the fuel supply line from the fuel tank
shut-off valve
and disconnect the fuel re-
turn line from the fuel tank.
4. Remove the bolts attaching each side of the
fuel tank to the
rear fenders.
5. Place a suitable chain or rope around the
fuel tank
and remove the tonk from the trac-
tor. Protect all openings of the fuel tonk and
the disconnected fuel lines against entrance
of foreign material.
D. Installation
Install the fuel tonk by a direct reversal of the re-
moval procedure (refer to C. above).

4. FUEL FILTERS
A. Description
The engine is equipped with two (2) fuel filters,
each containing a replaceable filter element. The
first stage fuel filter
is mounted at the left rear side
of the engine
and the second stage fuel filter is
mounted on the right side of the engine. A drain
cock
is provided in the bottom of each filter for
draining of water
and sediment.
'--_ fig. 4 - first Stage Fuel Filter Location .
18
B. Service
The service of each fuel filter is the same. To serv-
ice the fuel filters proceed as follows:
Open the mter drain cock daily, before
the engine
is started at the beginning of the day's operation
in warm weather or shortly after the end of the
day's operation in freezing weather, and allow
the water or sediment
to drain. Close the drain
cock
as soon as clean fuel runs out. Remove and
discard the old element and install a new element
after every
300 to 500 hours of operation (more
often
if conditions warrant) or when the filter ele-
ment becomes clogged. A clogged filter element is
usually indicated by irregular engine performance.
c. Replacement of First Stage
Fuel Filter Element
1. Close the fuel tank shut-off valve.
2. Thoroughly clean the filter cover
and the
surrounding
area. Loosen the drain cock, lo-
cated in the bottom of the filter shell, and
allow the filter to drain.
3. Loosen the cover screw and remove the cover
screwl cover screw gasket, cover, cover
gasket, and spring as a unit. Remove the
cover gasket from the cover and discard the
gasket.
4. Remove
and discard the element washer,
element gasket,
and the filter element.
5. Reaching inside the filter shell, remove the
element gasket
and elemen! washer from
the shell centerbolt
and discard.
6. Thoroughly wash
and dry the interior of the
filter shell. Close and tighten the drain cock
located
in the bottom of the filter shell.
7. Install a new element washer
in position on
the shell centerbolt, then install a new filter
gasket and press the gasket down firmly onto
the element washer.
8. Install a new elemen!
in position in the filter
shell. Place a new element gasket
and an

element washer in position on the shell cen-
terbolt and press the gasket down firmly
onto the top of the
fi Iter element.
9. Install a new cover gasket
in position in the
cover.
10. Open the fuel tonk shut-off valve and allow
the filter to fill with fuel, then install the cover
in position on the filter shell and tighten
the cover screw securely.
/"'"
COVER SCREW ~i
COVER SCREW
"'O."....--GASKET
~ __ -SPRING
COVER GASKET?
"""'''';~:''_EI.EMENT WASHER
ELEMENT GASKET~
FilTER ELEMENT
---
ElEMENT GASKET _-ELEMENT WASHER
COCK
FilTER
'-- __ Fig. 6 - First Slage Fuel filrer Oelalls
D. Replacement of Second Stage
Fuel Filter Element
1. Thoroughly clean the fuel filter head and
the surrounding area. loosen the drain cock,
located in the bottom of the filter shell, and
allow the Alter to drain.
2. Remove the Alter shell (with
its components)
from the fuel Alter
head by loosening the
shell retaining nut. 19
______ :;....-SCREW GASKET
VENT SCREW n
/.iJ RETAINING NUT GASKET
SHEIL RETAINING 0---
NUT
FUEL FilTER
FILTER ELEMENT
~
- ELEMENT SEATING
SEATING PLATE ~ .... ~ PLATE
GASKET~
ELEMENT s~ ~METAL WASHER
~GASKET
'-- __ Fig. 7 Second Stage Fuel filter Details
3. Remove and discard the Alter element. Re-
move the centering guide, element seating
plate, seating plate gasket, metal washer,
and element spring from the shell centerbolt.
Discard the seating plate gasket, metal
washer,
and shell gasket.
4. Thoroughly wash
and dry the interior of the
Alter shell. Close and tighten the drain cock
located
in the bottom of the filter shell.
5. Place the element spring (large end down-
ward) in position On the shell centerbolt and
install a new metal washer over the shell
center
bolt and down against the element
spring.
6. Install a new seating plate gasket
in position
in the element seating plate, then install the
gasket
and element seating plate in pasition
on the shell centerbolt.
7. Install the centering guide
in position on the

shell centerbolt and install a neW filter ele-
ment in position in the filter shell. Install a
new shell gasket
in position in the filter shell.
8. Hold the filter shell in position under the fuel
filter
head and tighten the shell retaining
nut. Remove the vent screw
and screw gasket
from the shell retaining nut.
9. With the engine shut-off knob pulled back
(stop position), crank the engine momentari-
ly with the starter until fuel emerges from
the vent screw opening
in the shell retaining
nut. Install the vent screw
and screw gasket
and tighten the vent screw securely.
10. Start the engine and observe for fuel leaks;
correct any leaks found.
L __ Fig. 8-Heavy-Duty
E. Heavy-Duty Fuel Filter
(Special Equipment)
On tractors equipped with a Heavy-Duty Fuel Fil-
ter, service as·follows:
Loosen the drain plug located in the bottom of the
fuel fllter housing, before the engine
is started at
the beginning of the day's operation in warm
weather or shortly after the
end of the day's op-
eration in freezing weather and allow the water
or sediment to drain. Tighten the drain plug when
clean fuel runs out. Remove
and discard the old
fllter element
and install a new one after every 300
20
to 500 hours of operation or when the fuel pressure
drops below 20 pounds per square inch.
A=,~~~VENT PLUG
,
I
I
I
,
I
GASKET
REINFORONG I
PLATE :
~
FUEL FILTER
HOUSING
,
=r;:qy GASKETS
L
'
HOLLOW iLDRAIN PLUG
Fig. 9 - Heavy-Duty Fuel Filter Details
F. Replacement of Heavy-Duty
Fuel Filter Element
1. Close the fuel tank shut-off valve.
2. Remove the drain plug from bottom of the
fuel filter housing
and then allow the fuel to
drain from the filter. Remove the cover cap-
screws ond lift the cover from the housing.
3. Unscrew the T-handle hold-down assembly
from the center tube
ond remove the T-han-
dle hold-down assembly and the element
centering plate. Remove the fllter element
from the housing by lifting
with the pull-out
bail.
DisC<'lrd the fllter element and the cover
gasket.
4. Clean the interior of the fuel filter housing
thoroughly
and install the drain plug.
5.
To assure leak-proof sealing, examine the

center-tube seal at each end of the new fll-
ter element to see that the seals are in good
condition and clean. Insert the new fllter
element into position
in the fllter housing
and press the fllter element down firmly.
6. Place the element centering plate in posi-
tion on the top of the fllter element and in-
stall the T-handle hold-down assembly and
tighten securely.
7. Install a new cover gasket
in position in the
cover
and place the cover in position on the
filter housing. Install the cover capscrews
and tighten evenly and securely.
8.
Fill the fuel tank so that there will be suffi-
cient fuel in the tank to fill the fuel fllter by
gravity. Open the fuel tank shut-off valve.
9. Remove the vent plug from the fliter cover
and allow the fllter to flll with fuel by grav-
ity. Install and tighten the vent plug when
fuel emerges from the vent
pll!l;J opening.
CAUTION, Use only a "DIESELPAK" filter
element in the Heavy-Duty Filter.
5. FUEl. PUMP
A. Description
The fuel pump is a constant flow gear type pump,
having a delivery capacity of approximately
35
gallons per hour at 1000 engine R.P.M. with a
pump discharge pressure of
40 pounds per square
inch. The pump is bolted to the rear end of the
blower end plate cover,
and is driven by the lower
blower rotor shaft through a self-aligning,
U-shaped, steel coupling.
Two steel gears revolve
inside the pump housing to
create a vacuum in the
intake chamber, thus drawing the fuel from the
fuel tank. The fuel
is carried around the gears in
the spaces between the teeth and is forced out of
the pump under pressure. The pump driving
gear
is mounted on a free-floating type driving gear
shaft and is attached to the shaft by a shear pin.
The pump driven
gear is supported in the bore of
the pump housing by
its supporting journal, which
is an integral part of the driven gear.
Two pump shaft oil seals are used inside the stator
at the coupling end. The sealing edge of one oil
seal faces the pump housing and retains the fuel
within the pump, the sealing
edge of the other oil
seal faces the coupling end of the stator and pre-
vents engine lubrication oil from entering the
pump.
Two (2) drain holes, located between the
two seals, vent to the atmosphere.
A spring loaded relief valve, located on the inlet
side of the pump (left side of pump viewed from
pump housing end),
is provided to by-pass fuel
back to the inlet side when the outlet pressure ex-
21
ceeds 47 to 60 P.S.1. This valve normally does not
open since
its purpose is to relleve excessive pres-
sure in case clogging occurs in the fuel lines or
filters.
B. Service
If the fuel pump is to be reconditioned, the pump
assembly must be removed from the engine.
C. Removal of Fuel Pump
1. Close the fuel tank shut-off valve.
2. Disconnect the two fuel lines from the pump.
3. Remove the three (3) capscrews attaching
the fuel pump to the blower end plate cover.

(Use the special fuel pump wrench to remove
the capscrew nearest the cylinder block.)
Remove the fuel pump
and the drive cou-
pling as a unit, withdrawing the pump
straight from the blower end plate cover.
4. Rotate Ihe pump driving
gear shaft by hand
10 see if the internal parts of Ihe pump rotale
freely.
If binding or sticking is evident,
disassembly
and inspection of the pump will
be necessary.
D. Disassembly of Fuel Pump
When repairing the pump, if an oil seal expanding
1001 is not available there is considerable danger in
damaging the oil seals when Ihe pump driving
gear shaft is again installed. When installing the
shaft,
il is very essential 10 install it withoul damage
to the 0 iI sea Is.
The relief valve assembly may be removed from
the pump slalor wilhout disassembly of the olher
paris of the pump,
by removing the pressure relief
valve plug
and jarring the valve parIs from the
pump slalor.
1. Remove the eight screws attaching the
pump
housing to the stator. Install four (4) cap-
screws v.. x 20 NC x 3 in four of the cap-
screw holes so that the heads of the screws
can
be tapped with a hammer to separate
the pump stator and the pump housing.
2. Holding the pump assembly
in the hand,
tap the heads of the capscrews with a soft
hammer, separating the pump stotor
and the
pump housing.
CAUTION: DO NOT PRY
PUMP STATOR AND PUMP HOUSING
APART.
3. Remove the driven gear from the pump
housing.
4. Remove the pump driving
gear shaft and
driving gear from the pump stator carefully,
to prevent
damage to the oil seals.
5. Remove the dowel pins
if necessary.
6.
If it is necessary to remove the oil seals from
the pump stator, a tool of the proper design
should be used to prevent damoge to the
seals.
When removing Ihe relief valve assembly, note the
position of each
part so thaI the parts may be
reassembled in their same relative position.
E. Inspection of Fuel Pump Parts
If only Ihe pressure relief valve assembly is to be
inspected, no further disassembly of the pump is
necessary. If the pump is to be dismantled, proceed
as follows:
1. Wash the fuel pump paris
in clean fuel or
solvent
and inspect carefully. The oil seals,
once removed from the pump, should be re-
placed
with new seols. If the sealing edges
of the oil seals are domaged in any way, so
DR1V!NG GEAR
PUMP STATOR ~._ I
DRIVING GEAR SHAFT ~ ~
INNE' OIL SEAL ~ ~
\
/' \ HOUSING
:I ", SHEAR PIN ;)RIVEN GEAR
~~
OUTER Oil
SEAL
)~ SPRING
PRESSURE RELIEF/'x., I jGASKEl
VAtVE PLuNGER , PLUG
GUIDE PIN ,
SCREW
o j;,
LOCKWASHER
'-- ________ Fig. 11 -Fuel Pump Detail. _________ ...J
22