955K Track Loader Service Manual

Service Repair Manual
Models
955K TRACK LOADER

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Product: TRACK LOADER
Model: 955K TRACK LOADER 71J
Configuration: 955L TRACK TYPE LOADER 71J04558-UP (MACHINE) POWERED BY 3304 ENGINE
Disassembly and Assembly
955K TRACK-TYPE LOADER POWER TRAIN
Media Number -REG00861-00 Publication Date -01/11/1993 Date Updated -10/10/2001
Flexible Coupling Drive
Removal And Installation
1-Bolts (sixteen). 2-Joints (four). 3-Bolt, washer assembly, washer (assemble with concave side against washer
assembly). 4-Flywheel output flange. 5-Torque converter input flange.
Checking Flexible Drive Coupling Alignment
Position engine in mounting location within the main frame. Check for correct engine-to-
transmission alignment as follows:
1. Remove the torque converter input flange.
2. Fasten a 7H1942 Indicator (with a 7H1940 Universal Attachment) to the torque converter input
shaft using a 7H1948 Snug, 7H1945 Holding Rod, 3/8 in. (9,5 mm) diameter rod 3 in. (76,2 mm)
long and a 1J9778 Hose Clamp.
1/3955L TRACK TYPE LOADER 71J04558-UP (MACHINE) POWERED BY 3304 EN...
2019/8/31https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

CHECKING VERTICAL AND HORIZONTAL ALIGNMENT (Viewed from left side of machine.)
Total indicator reading must not exceed .080 in. (2,03 mm). Correct any misalignment by adding or removing shims
under engine rear supports.
3. Zero the indicator on the outside diameter of engine output flange as illustrated. Take an
indicator reading every 90° while rotating the torque converter input shaft one complete turn.
4. Remove the 7H1940 Universal Attachment. Position the anvil of the dial indicator between the
bolt holes and the ouside diameter of engine output flange as illustrated.

CHECKING FACE ALIGNMENT (Viewed from left side of machine.)
Total indicator reading must not exceed .026 in. (0,66 mm). Move front of engine as necessary to obtain correct
dimension.
5. Zero the dial indicator. Take an indicator reading every 90° while rotating the torque converter
input shaft one complete turn.
6. Recheck both settings and adjust if necessary. When alignment is correct, tighten engine
mounting bolts as follows:
a. Front mounting bolts - 460 ± 50 lb. ft. (63,6 ± 6,9 mkg).
b. Rear mounting bolts - 225 ± 30 lb. ft. (31,1 ± 4,1 mkg).
Misalignment
If it is necessary to shift the engine from one side to the other in the frame, loosen the hold-down
bolts and shift the engine accordingly.
If the holes for the hold-down bolts are enlarged, dowels should be installed to hold the engine in
the proper location after it is bolted down.
Extreme misalignment is probably the result of bent main frame channels. They should be
straightened. Extreme wear in the engine front support will also cause misalignment.
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Aug 31 14:24:40 UTC+0800 2019

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Transmission And Torque Converter
Transmission Removal And Installation
1-Forged eyebolts (two 5/8" - 11 NC) (one 1/2" - 13 NC). Install and attach a hoist. 2-Transmission case-to-adapter
bolts (ten). 3-Support bracket-to-frame bolts (two-not shown). 4-Transmission output shaft. Move transmission
forward to clear output shaft before raising. Raise transmission about 3 in. (76,2 mm). 5-Support bracket.
6-Eyebolt and chain. 7-Transmission. Remove by tipping as shown.
6. Move the forward chain and eyebolt from the top of the torque converter housing to the top of
the transmission mounting flange as shown.

Removing Transmission From Case
1. Position the transmission vertically on a suitable stand or blocks.
2, 3, 4, 5-Bolts. Do not remove. 6-Bolts (two). Replace with 5/8" - 11 NC forged eyebolts. 7-Bolts (six).
8-Planetary transmission. Remove from transmission case and position vertically on blocks.
Transmission Disassembly

This is a cross section of the planetary transmission. The shaded areas, in order of removal, are: A-No. 1 clutch, clutch
housing and planet carrier. B-No. 2 clutch, clutch housing, ring gear and No. 1 ring gear. C-No. 3 clutch, clutch
housing and ring gear, No. 1 and No. 2 sun gear, No. 2, No. 3 and No. 4 planet carrier. D-No. 4 clutch, clutch housing
and ring gear. E-No. 5 clutch and ring gear. F-No. 5 clutch housing, No. 3, No. 4 and No. 5 sun gears, output shaft.
A - No. 1 Clutch, Clutch Housing and Planet Carrier 1. Remove only the three bolts located
by the "S" mark. When installing tighten to a torque of 85 ± 5 lb. ft. (11,8 ± 0,7 mkg).

2-No. 1 clutch housing. Invert, remove the two 3/8" bolts and disassemble as shown. The exploded view is shown
inverted.
B - No. 2 Clutch, Clutch Housing, Ring Gear and No. 1 Ring Gear

1-Pins (two). Drive flush with face of carrier to allow retaining ring removal.
C-No. 3 Clutch, Clutch Housing and Ring Gear, No. 1 and No. 2 Sun Gear, No. 2, No. 3 and
No. 4 Planet Carrier
1-Remove bolt and retainer from inside of sun gear. Then remove sun gear and install 3/8" - 16 NC forged eyebolt as
shown. 2-Clutch release springs (ten). 3-Clutch reaction pins (five).

D-No. 4 Clutch, Clutch Housing and Ring Gear
1-Pins (two). Drive flush with face of carrier to allow retaining ring removal.
E-No. 5 Clutch and Ring Gear

F-No. 5 Clutch Housing, No. 3, No. 4 and No. 5 Sun Gears and Output Shaft
1-Retaining ring. Must be removed first to allow output shaft to be lowered for removal of retaining ring at other end
of shaft.
Torque Converter Removal And Installation
1. Place transmission and torque converter unit on a suitable stand as shown.

2-Bolts (two). Replace two diametrically opposite bolts with 3/8" - 16 NC forged eyebolts. 3-Bolts (fourteen).
4-Torque converter oil supply tube.
5-Guide pins (two). With torque converter in position shown, remove two retaining bolts and replace with 1/2" - 13
NC guide pins. 6-Bolts (five). 7-Retainer. 8-Output shaft.
9-Cover.

5-Guide pins (two). 10-Forged eyebolt. Install 1/4" - 20 NC forged eyebolt and attach a hoist.
Torque Converter Disassembly

7, 26 Use an 8B7548 Push Puller, 8H663 Bearing Pulling Attachment and a S2398 Spacer to
remove bearings.
Sat Aug 31 14:25:32 UTC+0800 2019
10/10955L TRACK TYPE LOADER 71J04558-UP (MACHINE) POWERED BY 3304 ...

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Transmission Hydraulic Controls
Transmission Hydraulic Control Removal And Installation
1-Lever. 2-Lever. 3-Cover.
4-Clip. 5-Tube. Push into housing until clear of valve body. 6-Twelve-point head bolts (sixteen). 7-Six-point head
bolts (five).
Transmission Hydraulic Control Disassembly

Transmission Mechanical Control Linkage And Column
1-Grab iron assembly. 2-Knob. 3-Governor control linkage. 4-Bolts (six). 5-Column assembly.
6-Speed selector control rod. 7-Directional control rod. 8-Bracket. 9-Bolts (four). 10-Transmission control linkage.

Sat Aug 31 14:26:22 UTC+0800 2019

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Transmission Lubrication System Components
Transmission Lubrication Relief Valve Removal And
Installation
1-Tube assembly. 2-Bolts (four). 3-Lubrication relief valve.
Lubrication Relief Valve Disassembly
Oil Pump Removal And Installation

1-Bolts (two). 2-Transmission oil pump.
Oil Pump Disassembly
3, 6 Install bearings with joints at (A and B) as shown. Install bearings .062 in. (1,575 mm) below
the inner surfaces of the cover and base.
4 Pump drive gear must rotate freely by hand.
Transmission Oil Filter And Screen Removal And Installation
1-Bolts (two). 2-Oil pump supply tube and O-ring seal.

3-Nuts (five). 4-Filter and screen group with O-ring seals.
Transmission Oil Filter And Screen Disassembly
Sat Aug 31 14:27:14 UTC+0800 2019

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Bevel Pinion
Transmission Mounting Adapter Removal And Installation
1-Forged eyebolt (1/2"-13 NC) and nut. Install eyebolt and nut and attach a hoist. 2-Bolts (eleven). 3-Seal.
Transmission Mounting Adapter Disassembly

Bevel Pinion, Bearing Cage And Pinion Locating Shims
Removal And Installation
1-Bolts (four). 2-Bevel pinion bearing cage and bevel pinion. 3-Bevel pinion locating shims.
NOTE: If the bevel gear location is changed or if a new bearing cage or pinion is installed, the
pinion location must be checked. See BEVEL GEAR AND PINION SETTING.
Bevel Pinion And Bearing Disassembly
1 Press spacer onto bevel pinion shaft before installing shaft.
2 Use an arbor press to remove bearing cones.
3 For correct installation see the GENERAL INSTRUCTIONS under BEARINGS - DOUBLE
ROW, TAPERED ROLLER.
Sat Aug 31 14:28:05 UTC+0800 2019

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Steering Clutch And Brake Controls
Control Pedals Removal
1-Brake lock linkage. 2-Bracket. Remove two bolts securing bracket to support.
3-Left steering clutch control linkage. 4-Right steering clutch control linkage. 5-Caps (six). 6-Right brake control
linkage. 7-Left brake control linkage. 8-Control pedal assemblies.

This shows the pedals removed from the machine. The parts pointed out are: 9-Shims. Use as necessary to provide
clearance between levers and pedals.
Control Pedals And Support Brace Unit Removal And
Installation
1-Right brake control rod. 2-Left brake control rod. 3-Left brake pedal return spring. 4-Right brake pedal return spring. 5
-Steering clutch control rods.
6-Tilt cylinder lines. 7-Center brake pedal return spring. 8-Parking brake lock ratchet. 9-Control pedals and support
brace unit.
Steering Clutch Oil Filter Removal And Installation

1-Steering clutch oil filter.
Steering Clutch Oil Filter Disassembly
Steering Clutch Oil Screen
Steering Clutch Hydraulic Booster Removal
1. Remove steering booster cover.
2-Steering clutch hydraulic booster.
Steering Clutch Hydraulic Booster Disassembly

Oil Pump Removal And Installation
Viewed from rear. 1-Left steering clutch control rod. 2-Bolts (four). 3-Left steering clutch brake control rod. 4-Left
steering clutch pedal. 5-Pump outlet oil line. 6-Pump inlet oil line. 7-Bolts (two). 8-Steering clutch oil pump.
Oil Pump Disassembly

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3,7 Align bearing joints (at A and B) and install bearings .062 in. (1,57 mm) below the inner
surfaces of the cover and base.
4 Pump drive gear must rotate freely by hand.
Steering Clutch Mechanical Components
1-Lever. Loosen bolt and remove key holding lever to shaft. 2-Lever and shaft. 3-Race. At assembly press onto shaft so
top of race is 2.78 in. (70,6 mm) from upper end of shaft.
Steering Clutch Case Cover
1-Bearings. Not to project above bottom of counterbore.
Brake Engaging Mechanism

1-Cover. 2-Lever. 3-Key.
4-Bolt. Loosen and slide shaft through lever far enough to allow key to be removed from shaft. 5-Shaft. 6-Shaft
assemblies. 7-Stop shaft. 8-Stop shaft.
If stop shafts are removed from steering clutch case cover, the setscrews which hold the shafts in
position must be adjusted when installing the shafts. To do this, tighten the setscrews, then back off
11/2 turns and lock with lock wire.
Sat Aug 31 14:28:56 UTC+0800 2019

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Steering Clutches, Bevel Gear And Final Drive
Steering Clutch Case Cover Removal
Viewed from front of machine 1-Right brake control rod. 2-Left brake control rod. 3-Right pedal return spring. 4-Left
pedal return spring. 5-Right steering clutch control rod. 6-Left steering clutch control rod. 7-Steering clutch case oil
supply line. 8-Tube. 9-Cover. 10-Oil filter. 11-Steering booster cover.
12. Remove steering booster.
13 Pins.

14-Bolts (eighteen). 15-Forged eyebolts (three). Install 3/8"-16 NC forged eyebolts and attach a hoist. 16-Steering
clutch case cover.
Steering Clutch And Bevel Gear Shaft Removal
1-Rod ends. When installing rod end and adjusting nut, adjust dimension between center of hole in rod end and outer
face of adjusting nut to dimension shown. Lock with lock nut. 2-Bolts (twenty). 3-Bearing caps. The caps are marked
L and R and should be installed on the correct side of the machine.
Steering Clutch Removal
1-Lock. 2-Nut. Loosen until there is .25 in. (6,4 mm) between nut and hub. 3-Steering clutch, bearing and yoke. Pull

the steering clutch from the shaft by using a 7F9540 Hydraulic Puller, 6F25 or 3S6224 Pump Group, 8B7548 Push
Puller, two 8B7556 Adapters and an 8B7561 Step Plate.
Steering Clutch Installation
Be certain the splines on the bevel gear shaft and in the steering clutch driving drum are clean, dry
and free from burrs.
1. With the splines meshing, push the clutch onto the shaft as far as possible by hand.
2. Using a 7M7236 Adapter Group, 7F9540 Hydraulic Puller and 6F25 or 3S6224 Pump Group,
press the steering clutch driving drum onto the bevel gear shaft with a pressure of 15-20 tons (13,6
-18,1 M. tons). The distance between the face of the drum and the shoulder of the shaft must then
be .12±.03 in. (3,0±0,8 mm).
3. Install the steering clutch retaining nut. Tighten to a torque of 250±50 lb. ft. (34,6±6,9 mkg).
Install the lock.
Steering Clutch Disassembly
To remove or install locks (1) use a 7F9540 Hydraulic Puller, 6F25 or 3S6224 Pump Group, 8B7548 Push Puller, two
8B7556 Adapters, 8B7561 Step Plate and 7S8431 Spring Compressor Plate.

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