Table 2-1. Troubleshooting-Continued

Table 2-1. Troubleshooting-Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. DRIVE AXLE IS NOISY WHEN DRIVING OR COASTING.

Step 1. Check ring gear and axle shaft for wear.

Replace worn or. damaged ring gear or axle shaft.

Step 2. Check for worn or damaged pinion or side gears in differential case.

Repair or replace worn or damaged differential.

3. NOISE IS CONTINUOUS IN DRIVE AXLE.

Step 1. Check for wear and damage in all parts of drive axle.

Repair or replace worn or damaged parts in drive axle.

4. REAR STEERING AXLE SHIFTS WHEN TRUCK IS MOVED.

Step 1. Check for loose mounting bolts.

Tighten axle mounting nuts to 90 to 100 pound feet (124. 2-138. 0 m-kg).

Step 2. Check for proper adjustment of front spacer.

Tighten spacer adjusting bolt to a torque of 10 to 15 pound feet (1. 3 - 2. 0 m-kg). Tighten jam nut to a

torque of 90 to 100 pound feet (12. 4 to 13. 8 m-kg).

Step 3. Check for worn axle mounting bearings.

Replace worn bearings.

5. PARKING BRAKE DOES NOT HOLD PROPERLY.

Step 1. Check for worn or damaged brake calipers.

Replace brake calipers if worn or damaged.

Step 2. Check for worn or damaged brake disk.

Replace worn or damaged brake disk.

Step 3. Check for weak or broken spring.

Replace weak or broken spring.

6. SERVICE BRAKE PEDAL GOES TO TOE PLATE.

Step 1. Check for leaking or defective master cylinder.

Repair master cylinder if leaking or defective.

Step 2. Check for leaking or defective wheel cylinder.

Repair wheel cylinder if leaking or defective.

7. BOTH BRAKES DRAG.

Step 1. Check for foreign material in brake system.

Clean system and refill with approved brake fluid (LO10-3930-631-12).

Step 2. Check for dirty, damaged or defective cylinders.

Clean and repair master and wheel cylinders, if necessary.

Step 3. Check for clogged breather port in master cylinder.

Clean out breather port if necessary.

8. ONE WHEEL BRAKE DRAGS.

Step 1. Check for obstructed brake line.

Remove and clean brake line if obstructed.

Step 2. Check for air in brake lines.

Bleed brake lines if air is present.

Step 3. Check for weak or broken return springs.

Replace weak or broken return spring.

9. TRUCK PULLS TO ONE SIDE.

Step 1. Check for charred or damaged brake lining.

Replace charred or damaged brake lining.

Step 2. Check for scored or damaged brake drum.

Repair or replace scored or damaged brake drum.

10. STEERING IS LOOSE OR DOES NOT RESPOND PROPERLY.

Step 1. Check steering drag link adjustment.

Adjust drag link if necessary (TM10-3930-631-12).

Step 2. Check for defective steering cylinder.

Repair or replace defective steering cylinder.

Step 3. Check power steering pump pressure.

If pressure is not 900 to 1100 psi (63. 2-77. 3 kg/cm' ), repair or replace pump.

Step 4. Check for defective steering valve.

Repair or replace defective steering valve.

Step 5. Check for damaged or defective power steering pump motor.

Repair or replace damaged or defective motor.

Step 6. Check for damaged or defective power steering contactor.

Repair or replace damaged or defective contactor.

11. STEERING IS HARD OR SLOW.

Step 1. Check for dirt in hydraulic system.

Drain, flush and refill system if necessary (LO10-3930-631-12).

2-2