GUARD AS 4Z8755 - Caterpillar

Illustration 8 g00485953
Route a piece of strong string through an opening for the cam plate tension adjusters. Route the string over the sliding surface of cam plate (30) and through the opposite opening for the cam plate tension adjusters. Hold the string taut in order to keep cam plate (30) correctly engaged with keys (31). Keep the string taut and position the body of the travel motor on the body's side. Do not release the tension on the string at this time. Install barrel assembly (23) as a unit on the shaft. Pull the string out of the body of the travel motor. It may be necessary to pull the barrel assembly and the piston shoe assemblies away from the cam plate slightly in order to release the string.
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 piston (14) which contact the body of the travel motor. Install piston (14) in the body of the travel motor by hand. It may be necessary to use a soft faced hammer to seat the piston correctly.
Illustration 12 g00510352
Install washer set (14) in piston (13), as shown.
Install O-ring seals (12) in the body of the travel motor, as shown.
Illustration 13 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 14 g00510351
Install the O-ring seals on fittings (10). Apply Tooling (B) 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 15 g00510349
Illustration 16 g00510341
Apply Tooling (C) on the threads of the two 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.
Apply Tooling (D) on port plate (4). Install the port plate in the 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