LINK A. 4K7128 - Caterpillar

Illustration 9 g00651967
Install O-ring seal (21) and backup ring (22) on piston guide (19), as shown.
Illustration 10 g00510356
Place the body of the travel motor in a vertical position.
Apply clean hydraulic oil on five friction plates (20) and the four steel plates. Install the plates in alternating order in the body of the travel motor. Start with a friction plate and end with a friction plate.
Install piston guide (19) in the body of the travel motor until the piston guide contacts the counterbore in the body of the travel motor.
Illustration 11 g00878297Note: Make sure that brake piston (14) is thoroughly clean and free of dirt and debris.
Install O-ring seal (16). Install backup ring (15).
Install O-ring seal (17). Install backup ring (18).
Apply a thin coat of hydraulic oil on the surfaces of brake piston (14) which contact the body of the travel motor. Install brake piston (14) in the body of the travel motor by hand. It may be necessary to use a soft faced hammer to seat the brake piston correctly.
Illustration 12 g00878299
Illustration 13 g01000124
Install washer set (13) in piston (14), as shown.
Install O-ring seals (12) in the body of the travel motor, as shown.
Illustration 14 g00510605
Install the two pistons and two stoppers (39) in the housing of the travel motor. Tighten the stoppers to a torque of 140 14 N m (105 10 lb ft).
Illustration 15 g00510351
Install the O-ring seals on fittings (10). Use Tooling (D) on the threads of fittings (10). Install the fittings in the head, as shown.
Install plugs (11) in the head. Tighten each plug to a torque of 15 2 N m (11 1 lb ft).
Illustration 16 g00510349
Illustration 17 g00510341
Use Tooling (E) on the threads of the check valves. Install the check valves in the head.
Install seat (7), poppet (8) and spring (9) in the head at Location (X).
Install O-ring seal (6) in the head, as shown.
Install bearing (3) in the head until the bearing contacts the counterbore in the cover.
Use Tooling (F) on port plate (4). Install the port plate in the port plate's original position on the motor cover.
Use a shim or shims (5) so that the following requirements are met. Note: During the following checks, turn the travel motor output shaft in a clockwise direction.
The travel motor output shaft does not rotate with an applied torque of 440 N m (325 lb ft) or more with the parking brake release port open.
The travel motor output shaft rotates with an applied torque of 29 N m (21 lb ft) or less when the parking brake release port is pressurized to 780 kPa (115 psi) with both the inlet port and the outlet port open to the hydraulic oil tank. Note: It may be necessary to remove head (2) several times in order to determine the correct thickness of shim or shims (5) that are used to adjust the rolling torque of the travel motor output shaft.
Use Tooling (G) on shims (5). Install the shim or shims on the head. The grease will hold the shim or shims