12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Caterpillar


Parking Brake Rotochamber And Release Valve

Usage:

Remove And Install Parking Brake Rotochamber And Release Valve

------ WARNING! ------

Do not disconnect the air line to the parking brake rotochamber until the air pressure is zero. Failure to do so can result in personal injury.

--------WARNING!------

1. Disconnect the air pressure in the air tank by loosening the bleed valves.

2. Disconnect the air line (1) from parking brake release valve (3).

3. Connect a shop air line to the parking brake release valve (3).

4. Release the parking brake with shop air. Remove the cotter pin and pin (6) from rod end (5) and lever (7). Release the air pressure in the shop air line. Disconnect the shop air line.

5. Remove nuts (4) that hold rotochamber (2) to bracket (8). Remove rotochamber (2) from bracket (8).

NOTE: The following steps are for installation of the parking brake rotochamber.

6. Position the parking brake rotochamber (2) on bracket (8). Start nuts (4) on rotochamber. Do not tighten nuts (4).

7. Connect a shop air line to release valve (3). With shop air, move rod end (5) of rotochamber into position on lever (7). Install pin (6) that holds rod end (5) to lever (7). Install the cotter pin in pin (6).

8. Tighten nuts (4) that hold the rotochamber (2) to bracket (8). Remove the shop air line from parking brake release valve (3).

9. Connect air line (1) to parking brake release valve (3).

Disassemble And Assemble Parking Brake Rotochamber

Start By:

a. remove parking brake rotochamber and release valve

1. Remove release valve (1). Remove yoke (2) from rod.

------ WARNING! ------

The rotochamber is under spring tension. Do not remove bolts (3) until assembly is under compression. If cover is removed without tooling (A), personal injury can result.

--------WARNING!------

2. Install tooling (A) on the rotochamber assembly. Also, put wire (4) around assembly as shown to help keep assembly in alignment during disassembly.

3. Remove bolts (3), cover (5), rod assembly (6), spring (7) from body (8).

NOTE: The only replacement item in the rotochamber assembly is the spring. If any other items are in need of repair, the entire unit must be replaced.

4. If necessary, remove the O-ring seal (9) and the felt wiper seal (10) from rod assembly (6).

NOTE: The following steps are for the assembly of the parking brake rotochamber.

5. Install the felt wiper seal (10) and the O-ring seal (9) on the rod assembly (6).

6. Put rod assembly (6) in cover (5). Install spring (7) and body (8).

7. Put assembly in tooling (A) as shown.

8. Put wire (4) around tooling (A) for alignment purposes and with the assembly in compression. Install bolts (3) to hold cover (5) on body (8). Remove tooling (A).

9. Install release valve (1). Install yoke (2) on the rod.

End By:

a. install parking brake rotochamber

Caterpillar Information System:

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