980G Wheel Loader Braking System Caterpillar

Machine Preparation

Prepare the machine for testing by completing the procedure that is specified in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.

Adjustment Procedure

This procedure should be used when the parking brake does not engage.

The parking brake may not engage if the following conditions exist:

• The parking brake control cable is stretched.

• The parking brake control cable is damaged.

If these conditions exist install new parking brake control cable. Use the following procedure to adjust the parking brake control cable.

Illustration 1	g00481249
Parking Brake Control Assembly

Illustration 2	g00483512
Detail A (1) Parking brake control knob. (2) Nut. (3) Grommet. (4) Bulkhead nuts. (5) Bracket. (6) Cable end.

Illustration 3	g00481250
View A-A (7) Lever assembly. (8) Clevis pin. (9) Cotter pin. (10) Rod end. (11) Jam nut. (12) Cable end. (13) Bulkhead nuts. (14) Bracket.

1. Center bulkhead nuts (13) on bracket (14). Tighten bulkhead nuts (13) to a torque of 38 ± 7 N·m (28 ± 5 lb ft).

2. Extend the parking brake control cable until cable end (6) is all the way out. Cable end (6) is for parking brake control knob (1). Keep the parking brake control cable in this position during Step 3.

3. With the parking brake cable and the parking brake linkage in the engaged position, thread rod end (10) onto cable end (12). Thread rod end (10) onto cable end (12) until the hole in rod end (10) is in alignment with the hole in lever assembly (7). Turn rod end (10) clockwise for an additional ten full turns. Be sure that you align the hole in rod end (10) with the hole in lever assembly (7) .

4. If necessary, reposition bulkhead nuts (13) on bracket (14) in order to correctly position rod end (10) in Step 3.

5. Tighten jam nut (11) against rod end (10) to a torque of 8 ± 3 N·m (6 ± 2 lb ft).

6. Install clevis pin (8), and cotter pin (9) .

7. Position bulkhead nuts (4) on cable end (6) into bracket (5) .

8. Tighten bulkhead nuts (4) to a torque of 38 ± 7 N·m (28 ± 5 lb ft).

9. Install grommet (3) onto cable end (6). Install grommet (3) into bracket (5). Thread nut (2) onto cable end (6). Thread parking brake control knob (1) onto cable end (6) .

10. Thread nut (2) against parking brake control knob (1). Tighten nut (2) to a torque of 8 ± 3 N·m (6 ± 2 lb ft).