943 & 953 TRACK-TYPE LOADER POWER TRAIN Caterpillar

Pump (Track Brake Release)

Usage:

Remove Pump (Track Brake Release)

START BY:

a. lift cab (24° position)

NOTE: Earlier model loaders used a hand pump mounted in the cab to release the parking brake pressure. The later model loaders have eliminated the cab mounted hand pump as well as the bleed tubes and U-tubes which were located in the engine compartment. FT1845 Brake Release Group is available as a replacement for the earlier used hand pump. See Service Magazine, April 16, 1984, for instructions on construction and usage of the FT1845 Brake Release Group.

1. Disconnect oil lines (1) from pump (2) for track brake release.

2. Loosen the setscrews in knobs (3). Hold the pump and valve stems, and loosen knobs (3) and remove.

3. Remove nuts (4) and pump (2) for track brake release.

Install Pump (Track Brake Release)

1. Put the pump for track brake release in position on the cab, and install nuts (2) that hold it in place.

2. Hold the pump and valve stems, and install knobs (1). Tighten the setscrews in the knobs that hold them in place.

3. Connect oil supply line (3) from the oil pan on the hydrostatic power control unit to the pump.

4. Connect oil pressure line (4) from the bracket on the left side of the frame to the pump.

END BY:

a. lower cab (24° position)

b. remove air from track brakes ^*

^*For the procedure to remove air from the track brakes, see Testing And Adjusting.

Disassemble Pump (Track Brake Release)

START BY:

a. remove pump (track brake release)

1. Loosen collar (1), and remove the pump stem assembly.

2. Loosen collar (2), and remove the brake engage stem.

3. Remove fittings (3) from the block.

4. Use tool (A) to remove snap ring (4) from the block. Remove plug (5), spring, stem, washers and ball for the pump relief valve from the block.

5. Put identification on the block as to the location of the components.

6. Use tool (A) to remove snap rings (6) from the block. Remove plug (7), spring and valve from block. Remove plug (8), spring and valve from block. Remove the plug, spring and valve from port (9) after plug (8), spring and valve are removed.

Assemble Pump (Track Brake Release)

1. Be sure all passages in the block are clear. Put clean oil on all parts before assembly.

2. Install check valve (1), spring (3) and plug (5) in the block. Plug (5) must be pushed past the opening for plug (6) so plug (6) can hold plug (5) in place.

3. Install brake engage valve (2), spring (4) and plug (6) in the block as shown. Use tool (A) to install snap ring (7) in the block.

4. Install check valve (8), spring (9) and plug (10) in the block. Use tool (A) to install snap ring (11) in the block.

5. Install ball (12), stem and washers (13), spring (14) and plug (15) for the pump relief valve in the block. Use tool (A) to install snap ring (16) in the block.