Serv

ice

Man

ual

Service Manual

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF CATERPILLAR OR IT’S SUCCESSORS. CATERPILLAR AND IT’S SUCCESSORS ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

Twenty-Five S/n 3C1 & Up

CT-S-25

2

Index A Page

Aocessory shaft assembly ..................•...................... 14 Accessory shaft gear ............................................. 13 i\ir cleaner ..•................................................... 20 Arm assembly, rocker •........................................... 20 Auxiliary spring, equalizer ..................................... ; .. 65

B Bevel gear and pinion ......................•.............. " .....• ~. 61".-Bevel gear and shaft ...................................... ~ ..... ~. 59 Bevel gear and shaft adjustment. ...........................•. ' ' ..... 60 Bevel gear bearings ............................................. :; 60 Brake band, steering clutch ....................................... 54 Brake, flywheel clutch .....................•..... , ................ 34 Bushings, piston pins and ......................................... 29 Bushings, track pins and .......................................... 69 Bushings, valve guide ............................................. 25

C Cage holder, sprocket hub bearing ................................ .45 Cam shaft ....................................................... 12 Cam shaft gear .................................................... 11 Carburetor .............. , ...... ~ .......................... ' ...... 20 Carrier roller, track ............. , ................................ 62 Case, final drive gear assembly ................................... .49 Cleaner, air .... ; .................................................. 20 Clutch brake, flywheel. ................................... , ....... 34. Clutch, flywheel. ............................ , ...... , ; .... , ...... . 3i Clutch release bearing, steering ................................... 58

. Clutch shift fork, flywheeL ................. , .... , .... , ... , ....... 3+ Clutch, steering ............................. , ..................... 56 Collar and grease tube, flywheel clutch shift fork .................... 34 Connecting rod bearings, main and ................................ 29 Connecting Rod and Piston ....................................... 26 Cover, final drive gear case ...................................... .48 Cov,er, transmission case top ................ , ........... , ......... 3-1-Crank shaft ........................................... ' ........... 39 Crank shaft gear ..................•.............................. 10 Crank shaft thrust washer ......................................... 11 Cylinders ................. ~ . ; .................................... 25 Cylinder head ..................................................... 22

E Engine .......................................................... 36 Equalizer auxiliary spring ......................................... 65 Equalizer spring .................................................. 65

F Fan ............................................................ S Final drive assembly ............................................. 50 Final drive gear case assembly ................................... .49 Final drive gear case cover ................. " ..................... 48 F · I d . ., . t;3 Ina rIve pInIon ................................................. ~

3 INDEX-Continued

F ~~ Flywheel ............... : ......................... o ••••••••••••••• 38 Flywheel clutch .................................................. 37 Flyw heel cl u tch brake ....•........... : ........... ~ ............... 34 Flywheel clutch shift fork ......................................... 34-Flywheel clutch shift fork collar and grease tube ........... 0 ••••••••• 34 FOoreword ....................................................... 1 Forks and shafts, gear shift ....................................... 40 Fork, flywheel clutch shift •....................................... 34 Frame, -track roller ................................................ 44 Front idler ....................................................... 64-Fuel tank ........................................................ 33

G Gear, accessory shaft. ............................................ 13 Gear and shaft, reverse ........................................... 43 Gear assem hi)" transmission speed change ........ " .... " ........... 40 Gear, cam shaft ...... " .......... " ........ " ....................... 11 Gear case assembly, final drive ........... , .... " ................. .49 Gear, crank shaft ........................................... : ..... 10 Gear housing, timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9 Gear shift forks and shafts ........................................ 40 Governor ............. 0 •••••••••••••••••••••••••••••••••••••••••• 18 Grease tube, flnvheel clutch shift fork collar and .................... 34 Grinding vah·~s .................................................. 24 Guard, track roller frame top ...................................... 63 Guide bushings, yalve ............................................ 25

-R Head, cylinder ............ " ...................................... 22 Hood ............................. " .......... ".................. 7 H . .. 9 ouslng, timing gear ........ " ......................... " ......... .

I Idler, front .................... " ................................. 64

L Lifters, valve ............................................... " .. ·· 21 Lower transmission shaft" ........................................ 42 Lower transmission shaft adj ustment ... " .......................... 61

M Mao-neto tilnine- ...... " ........ " .................................. 16

b <.J 1-Magneto ............... " .............. " ..... " ... ""." .... "....... :J . . db' 0 ?9 MaIn and connectmg ro eanngs" ................................ -

Manifolds ...... " ............ '0" •• " • " • " ••••• " ." ••••••••• , ••••••• ~O

o 0 '1 ..,? I pun1p ............ " ........................................... .)-0 '1 d' ..,., I pump a Justment. ........................ ; ................... .).) Oil seals, sprocket hub bearing .................................... 45

p Pinion, bevel gear and ............................................ 61 P·· fi 1 d . -., InIon, na rlye ................................................ J.)

4 INDEX-Continued

p Page Pins and bushings, track ... ~ ...................................... 69 Piston, connecting rod and ..................................... , .. 26 Piston pins and bushings ......................................... 29 Piston rings ...................................................... 27 Pump adjustment, oil. ............................................ 33 Pump, oiL ........................................................ 32 Pump, ,Yater ...................................................... 17

R Radia tor ........................................................ 7 Recoil spring, track ............................................ " ... 63 Release bearing, steering clutch ................................... .58 Reverse gear and shaft ............................................ 43 R· . ?7 Ings, p 1st on .................................................... ... Rocker arm assembly ............................................. 20 Rod and Piston, connecting ....................................... 26 Rod bearings, main and connecting ................................ 29 Roller, track ..................................................... 61 Roller, track carrier ............................................... 62

S Seat ............................................................ 36 Shaft assembly, accessory ......................................... 14 Shaft, cam ....................................................... 12 Shaft, crank ..................................................... 39 Shift fork, flywheel clutch ......................................... 34 Shift forks and shafts, gear ........................................ 40 Speed change gear assembly, Transmission ........................ .40 Spring, equalizer auxiliary ........................................ 65 Spring, track recoil ............................................... 6.3 Springs, valves and ............................................... 23 Sprocket ......................................................... 46 Sprocket hub bearing adjustment. ................................. 51 Sprocket hub bearing cage holder ..................... " ............ .45 Sprocket hub bearing oil seals .................................... .45 Sprocket shaft .................................................... 51 Steering clutch ................................................... 56 Steering clutch brake band. " ..................................... 54 Steering clutch outer drum ........................................ 52 Steering clutch release bearing ...................................• 58 Steering clutch release yoke ....................................... 58

T Tank, fuel ....................................................... 35 Thrust washer, crank shaft ....................................... 11 Timing gear housing ....................................... " . . . . .. 9 T · . t l' Iming magne o. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0

Track ........................................................... 66 Track carrier roller ............................................... 62 Track pins and bushings .......................................... 69 Track recoil spring ..... '.' ........................................ 63 Track roller ..................................................... 61 Track roller. frame ............................................... 44 Track roller frame inner bearings and drawbar assembly ............. 66

". '.:::~. '-:.

5 INDEX-·Continued

T Page Track roller frame outer bearing .................................. .43 Track roller frame top guard .........•............................ 63 Transmission case top cover ....................................... 34 Transmission shaft adjustment, lower. ............................. 61 Transmission shaft, lower ......................................... .42 Transmission shaft, upper ........................................ 41 Transmission speed change gear assembly •......................... 40

U Upper transmission shaft ............•........................... .41

V Valve grinding .................................................... 24 Valve guide bushings ...................... 0 • 0 •••• 0 •••• 0 •••••••••• 25 Valve lifters. 0 •••••• 0 0 ••••••••••••••••••••••••••••• ; .••••.••••••••• 21 Valve springs and valves .... 0 •• 00 • 0 0 0 0 ••••• 0 •••••• 0 ••••••••••••••• 23

W Water' pump ..................................................... 17 Washer, crank l shaft thrust. ....................................... 11

Y Yoke, steering clutch release ...................................... 58

9

key from front end of fan shaft. Remo,~e TI~IING GEAR HOUSING. Remove two cap screws holding fan gear housing to inner face of timing gear housing and housing may be lifted off. Fan shaft and "gear may then be pulled out.

Fan gear is a press fit on shaft and is held with \Yoodruff key. Should it be necessary to replace this gear be sure to line up oil hoie in gear with oil hole in shaft.

In reassembling note that \Voodruff key should also engage notch in timing gear thrust washer. Bolt fan gear housing in position before re­pla.cing fan.

FAN UNIT DISASSEMBLED

I-Fan. 2-Fan hub retaining nut. 3-Fan hub. 4-Fan shaft. S-Thrust washer. 6-Fan gear. 7-Fan gear housing. 8-Timing gear housing

TIMING GEAR HOUSING

To remove: Remove RADIATOR. Disconnect carburetor control lever from carburetor control rod. Disconnect goyernor spring from governor spring lever. With small end of spark plug wrench remoye screw which secures oil1ine to fan gear housing. Remo,-e nuts from studs extending through rear of timing gear housing plate on either side of fan gear housing. Re.move bolts and cap screws holding timing gear housing to timing gear housing plate and crank case.

Remove timing gear housing and fan assembly complete by pulling fClrw~Hd"

REMOVING CRANK SHAFT GEAR

1-Crank shaft gear. 2--<Special puller. 3-Starting crank jaw lock plate. 4-Starting crank jaw

CRANK SHAFT THRUST.WASHER

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To remove: Remove CRANK SHAFT GEAR. Loosen locks and re­move four cap screws from thrust plate. Thrust washer may then be pried off shaft.

REMOVING CRANK SHAFT THRL'ST UNIT

1-Thrust plates. 2-Thrust washer. ~Spacer. 4-Front end of crank shaft

CAM SHAFT GEAR

To remove: Remove TIMING GEAR H'OUSING. Straighten lock and remove nut from front end of cam shaft. Install puller so that heads of machine bolts engage inner edges of holes in gear. Heads of bolts should be wedged so that they will stay in place while gear is being pulled.

When replacing cam shaft gear be sure that "C" mark on its rim matches w'ith "C" mark on rim of crank shaft gear.