CT-S-GRADER#12

CCaatteerr ppii ll llaarrService Manual

#12 Motor GraderS/n 8T1, 70D1,

71D1 & 80C1 & up

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF CATERPILLAR OR IT’S SUCCESSORS. CATERPILLAR AND IT’S SUCCESSORSARE 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.

Serv

ice

Man

ual

No. 12 Motor Grader SERIAL NUMBERS IT1-UP

CATERPILLAR TRACTOR co. • PEORIA, ILLINOIS, U.S.A.

Specifications

General Instructions

Diesel Engine

Table of Contents

Hood and Dash Removal

Radiator Removal

Removing Diesel Engine

Power Transmission Units

Flywheel Clutch

Transmission

Final Drive

Tandem Drive Housing Assembly

Power Controls

Clutch Control

Power Control Column

Blade Lift Control

Leaning Wheel Control

Circle Centershift Control

Circle Draw bar

Circle Reverse Control

Universal Joints and Control Shafts

Ball and Socket Joints .

Steering

Steering Gear Control.

Front Axle and Wheels

Attachments

Cab

Scarifier Controls

Scarifier Teeth

Odometer

Hydraulic Steering Booster.

Index

Page

4

7

15

15

16

25

34

68

71

89

91

93

96

102

105

106

110

III

113

119

129

130

132

133

133

161

Specifications

POWER TRANSMISSION UNITS

Flywheel Clutch Pressure Springs

Lbs. pressure ............................ .

When compressed to ...................... .

Release lever to bearing cage clearance ...... .

Release arm to plug clearance ............... .

Transmission

346-406

4 in.

3/16 in .

. 015-.020 in.

Bevel gear and pinion backlash. . . . . . . . . . . . . .. as marked on bevel

gear or .008-.010 in.

Tandem Drive Housing Assembly Dri ve chain (slack) .......................... .

Axle shaft end clearance .................... .

Spindle bearing pre-load ................... .

Sprocket-to-hub press fit, tons.

BRAKES

Brake Shoes

Clearance at top of shoe .................... .

Clearance at bottom of shoe ................ .

Master Cylinder Linkage, free play ......... , ................ .

POWER CONTROLS

Leaning Wheel Control Housing Worm shaft end clearance .................. .

Circle Centershift Control Clearance between rack and drive pinion .....

Ball and Socket Joints Clearance between ball and socket ........... .

STEERING

Shock Arrestor Worm bearings, preload (torque) ... ' .......... .

Clearance between shock rolls and worm lug ..

4

1 in .

. 010in.

.005 in.

30

.008 in.

.020 in.

liz in.

.005 in.

.030 in.

.015-.045 in.

5-15 lb.-in .

. 002-.004 in.

CLEANING AND INSPECTION

Clean all parts thoroughly after they are removed and inspect them. Be sure all lubricant passages and oil holes are open. Badly worn or damaged parts should not be put back in the machine. Cover all parts to keep them clean until they are installed.

Anti-friction bearings should receive special handling. As soon as a bearing is removed, cover it to keep out dirt and abrasives. Wash bear­ings in non-inflammable cleaning solution and inspect the races and balls or rollers. Discard the bearings if they are pitted, scored, or burned. ILthe bearing is serviceable, coat it with light oil and wrap it in clean paper. Do not unwrap new bearings until ready to install them.

ASSEMBLY

Clean the rust preventive compound from all machined surfaces of new parts before installing them. Be sure to install parts in the proper location and position.

When one part is pressed into another, use white lead or a suitable prepared compound to lubricate the mating surfaces. Tapered parts, however, should be assembled dry. Before assembling parts with tapered splines, be sure the splines are clean, dry and free from burrs. Then press the parts together tightly.

When possible, soak new leather seals in warm oil for a half hour before installing. Install the seal with the wiping edge turned in the direction recommended. Be careful not to cut the leather seal as it is installed or when installing a shaft through the seal. Use shim stock if necessary to protect the seal from shoulders or sharp edges during in­stallation. Packing-type seals should always be renewed if the contacting part is removed.

SHIM STOCK

9935

10

PROTECTING SEAL DURING INSTALLATION

•

REMOVING ENGINE FROM CARRIAGE ARRANGEMENT 28-Eye. 29-Eye.

LIFTING EYES Lifting eyes, which attach to two left front and two left rear cylinder

head st'uds, provide a convenient anchor point for cable slings or chains. The illustration shows the 5F6187 Front Lifting Eye (1) and 5F6122 Rear Lifting Eye (2) which can be used with two each 4F9827 and 4F9828 Nuts (5) in place of standard nuts and washers on cylinder head studs. One 6B6224 Ferrule (6) and one 6B6225 Seal (7) are required for the opening in the cylinder head for the water line (4) from the starting engine if the lifting eyes are to remain on the engine permanently. The vent cock (3)

which was in the standard water elbow can be used.

ENGINE LIFTING EYES I-Front lifting eye. 2-Rear lifting eye. 3-Vent cock. 4-Water elbow on

rear lifting eye. 5-Nuts. 6-Ferrule. 7-Seal.

21

POWER CONTROL HOUSING ASSEMBLY l-Capscrew. 2-Column. 3-Brace. 4-Gear. 5-Shaft. 6-Gear. 7-VVasher.

a-Nut. 9-Cover. lO-Coupling. ll-Lower coupling.

shown to remove the bushing (12). The seal under the bushing should

be replaced if leaking or damaged. A leaking seal would be evidenced

by the lubricant level falling in the power control housing.

Remove the nut (18), the lockwasher and the flange (17). After remov­

ing the capscrews, take off the cover (16). The worm (15) and the bear­

ings (19) will come out as a unit. The bearings may be pulled using an

8B7548 Push Puller and 8B755l Bearing Pulling Attachment. The bearing

races (14) may be pulled using an 8B7548 Push Puller and 8B7554 Pulling

Attachment. Replace the bushing (13) if worn.

PULLING UPPER BUSHING 12-Bushing.

92

Index

Adjustments:

Bevel Gear and Pinion

Chain, Tandem Drive

Flywheel Clutch .

Shock Arrestor

Transmission Brake

Wheel Brakes

Wheel Spindle Bearing

Wheel Toe-in

Arm, Leaning Wheel

Attachments

Axle, Front .

Axle Shaft .

Axle and Wheels, Front

Ball and Socket Joints

Bearing, Clutch Pilot .

Bevel Gear and Pinion Adjustments

Blade Lift Control

Brake Adjustment

Brake, Clutch

Brake Cylinder, Wheel

Brake Master Cylinder, Hydraulic

Brake Reconditioning .

Brake, Transmission

Cab

Caps, Valve

Chain, Tandem Drive.

Circle . Reverse

Clearance and Tolerances .

Clutch, . Flywheel

Adjustment .

Brake

Levers, Release

Pilot Bearing

Plates

Pressure Plate and Springs .

1 h 1

Page

63

73

32 117 49

83 80

126 122 129 119 76

119 III

29 63

93

83 32 84 85

81

47

129 121 72

107 4

25

32 32 28 29 26 28

INDEX - Continued

Clutch, Flywheel, continued

Seal, Clutch and Transmission

Sleeve .

Throwout Bearing Cage

Throwout Yoke

Compartment, Transmission, Dual Ratio

Compartment, Transmission Speed Change

Controls, Power

Blade Lift Control

Bevel Gear Housing Group .

Worm Gear Housing Group

Circle Centershift Control .

Checking Backlash Between Rack and Circle

Centershift Driving Pinion

Worm

Circle Drawbar

Circle Reverse Control

Transfer Gear Housing

Circle Reverse

Gear and Worm

Circle

Clutch Control

Shifter Fork

Control Column, Power

Leaning Wheel Control

Bevel Pinion Case

Control Housing

Removing Blade Assembly from Circle

Controls, Scarifier

Diesel Engine

Drag Link

Drawbar, Circle

Dual Ratio Compartment, Transmission

Dual Ratio Shift Mechanism, Transmission

Engine, Diesel

Eyes, Engine Lifting

Filter, Transmission Oil lh'7

Page

33

29

31

30 50 57 89 93 94

95 102

104 103 105 106 106 107 108 109 89 90 91 96 96 99

109 130

15 122

105 50 36 15 21

43

INDEX - Continued

Final Drive .

Final Drive Gear

Final Drive Pinion

Flywheel Clutch.

Fork Shifter Mechanism, Transmission

Front Axle .

Front Axle and Wheels

Front Wheel Alignment

Gear Locations for Various Speeds, Transmission

Glass Installation, Cab

Hood and Dash .

Hydraulic Steering Booster

Control Valve

Cylinder and Piston

Hydraulic Steering Gear

Lower Bearing Removal from Cover

Pump

Pump Drive

Relief Valve

Steering Shaft and Ball Nut

Interlock Mechanism, Transmission

Joints, Universal.

Knuckle, Steering

Lean Control Tie Bar

Leaning Wheel Control

Leaning Wheel Arm

Lifting Eyes, Engine

Link, Drag .

Lubrication, Transmission

Master Brake Cylinder, Hydraulic

Odometer

Oil Pump and Filter, Transmission

Pilot Bearing, Clutch .

Pinion Shaft Assembly, Transmission

Plates, Clutch

Power Controls

163

Page

68 69 70 25 37

124 119 125

34 129

15 133 144 157 143 157 134 139 141 153

38 110 122 121 96

122 21

122 46 85

133 43 26 62 26 89

INDEX - Continued

Power Control Column

Pressure Plates and Springs, Clutch.

Pump, Hydraulic

Pump, Transmission Oil

Radiator

Radius Rod

Release Levers, Clutch

Removing Diesel Engine

Scarifier Controls

Scarifier Teeth

Seal Replacement, Clutch and Transmission

Shaft, Axle .

Shifter Fork, Transmission

Sleeve, Clutch

Specifications

Spindles, Wheel

Steering

Steering Gear Control.

Shaft Assembly

Shock Arrestor

Snubber

Worm

Steering Gear, Hydraulic

Steering Hydraulic Booster

Tandem Drive Housing Assembly

Axle Shaft

Chain

Tandem Drive Housing and Sprocket.

Wheel Spindles

Teeth, Scarifier .

Throwout Bearing Cage, Clutch

Throwout Yoke, Clutch

Tie Bar, Lean Control.

Tires

Toe-in Adjustment

Transfer Gear Housing 1 hLi

Page

91

28 134 43 15

124 28 16

130 132 33 76

37

29 4

78 113 113 114

116 115

116 143 133

71

76

72 74 78

132 31 30

121

120 126 106

INDEX-Con tin ued

Page Transmission:

.~.

Bevel Gear and Pinion Adjustments 63 Brake 47 Disassembly, Transmission. 49

:?":

Dual Ratio Compartment:

Assembly 55 Gear Removal 53 Removal 50

Dual Ratio Shift Mechanism 36 For k Shifter Mechanism 37 Shifter Fork 37

Gear Locations for Various Speeds 34 Lubrication 46 Oil Pump and Filter 43 Piqion Shaft Assembly 62 Shifter Forks, Shaft and Gate Lock 41 Speed Change Compartment 57

Bevel Pinion Shaft 59 Reverse Gear Idler Shaft 58

Speed Selector Shift Mechanism Interlock. 38 Universal Joints 110 Valve Caps. 121 Valve, Control Hydraulic Steering 144 Valve, Hydraulic Steering Relief 141

.': ..•. ',:" .. ~' . . ....

Wheel, Alignment, Front 125 Wheel Brake Cylinder Installation 85 Wheel Brake Cylinder 84 Wheels, Front 120 Wheel Spindles 78 Yoke, Clutch Throwout 30

FORM 30124

lGS