Table 4-2. Troubleshooting-Continued

TM 10-3930-632-12

Table 4-2. Troubleshooting-Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

BRAKES

1. BRAKES GRAB.

Step 1. Inspect brake shoes for evidence of grease or oil on lining.

Replace brake shoes (para 4-75).

Step 2. Check linings for imbedded dirt and grit.

Clean linings with a stiff brush.

Step 3. Check for rough or scored drum.

Replace drum and brake shoe assemblies (para 4-75).

2. BRAKES DRAG.

Step 1. Check for improper pedal adjustment.

Adjust brake pedal and linkage (para 4-78). Report defective parts to direct

support maintenance personnel.

Step 2. Check to see if brake shoe anchor pin is tight in shoe.

Free pin and lubricate lightly.

Step 3. Inspect for broken or weak brake shoe return spring.

Report condition to direct support maintenance personnel.

Step 4. Check for loose or damaged wheel bearings.

Adjust or replace wheel bearings (para 4-71).

3. BRAKE LOCKED.

Step 1. Check for free travel in pedal and linkage.

Free binding linkage and pedal. Determine and correct cause; lubricate linkage. Report

defective parts to direct support maintenance personnel for repair.

Step 2. Inspect brake shoe assembly for jammed condition.

Report condition to direct support maintenance personnel.

4. BRAKE NOISE OR CHATTER.

Step 1. Inspect brake linings for wear.

Replace worn brake shoes (para 4-75).

Step 2. Inspect brake linings for grease.

Locate and correct leakage. Replace affected shoes and parts (para 4-75).

Step 3. Inspect brake shoes for imbedded dirt.

Clean linings with wire brush.

Step 4. Check to insure that proper linings are being used and are securely mounted.

Install proper linings (para 4-75).

Step 5. Check brake shoes and drums for distortion.

Replace defective parts.

5. EXCESSIVE BRAKE PEDAL TRAVEL.

Step 1. Inspect linings for wear.

Replace linings (para 4-75).

Step 2. Check pedal free travel.

Adjust brake pedal and linkage (para 4-78).

6. EXCESSIVE PEDAL PRESSURE NECESSARY TO ACTUATE BRAKES.

Step 1. Check master cylinder fluid level.

Add fluid as necessary.

Step 2. Check linings for oil saturation; glazed or worn linings.

Replace defective or worn linings (para 4-75).

Step 3. Check shoes and drums for warpage; scored drum.

Replace defective parts (para 4-75).

WHEELS

1. WHEEL WOBBLE.

Step 1. Check wheels for warpage or damage.

Replace defective parts.

Step 2. Check wheels for security of mounting.

Tighten wheel mounting studs.

Step 3. Check wheel bearings for play.

Adjust wheel bearings (para 4-71).

HYDRAULIC SYSTEM

1. HYDRAULIC PUMP NOT DELIVERING OIL.

Step 1. Check hydraulic tank level.

Fill tank with fluid as specified in lubrication order.

Step 2. Check for air leak in hydraulic lines.

Replace parts as required to effect repair.

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