POOR BRAKE ACTION, HIGH PEDAL PRESSURE REQUIRED.

TM 10-3930-633-12

MALFUNCTION

TEST OR INSPECTION

CORRECITVE ACTION

Step 2. Check for overheated cooling system.

Perform tests and corrective actions listed under "COOLING SYSTEM."

Step 3. Check for constant, low speed, overloaded operation.

Reduce vehicle loading.

BRAKES

1. POOR BRAKE ACTION, HIGH PEDAL PRESSURE REQUIRED.

Step 1. Check fluid level in master cylinder.

Fill master cylinder reservoir to within inch of filler neck.

Step 2. Check for leaks in vacuum line to booster.

Tighten or replace vacuum line.

Step 3. Check for grease on brake linings.

Replace defective grease seal; refer to direct or general support maintenance for brake reline.

Step 4. Check for excessively worn or glazed lining.

Refer to direct or general support maintenance for brake reline.

Step 5. Check for leakage in hydraulic lines to wheel cylinders or master cylinder.

Correct leaks, replace lines and fittings as required.

REAR AXLE

1. CONTINUOUS NOISE FROM AXLE.

Step 1. Check for low lubricant level.

Refill to proper level (para 4-84).

Step 2. Check for uneven tire sizes or pressure.

Install correct tire size and inflate to proper pressure (45 PSI).

Step 3. Check rear wheel bearings for wear.

Adjust or replace wheel bearings as required (para 4-75).

Step 4. Check for loose mounting bolts around differential mounting or reduction gearcase.

Tighten loose mounting bolts.

2. NOISE FROM AXLE ON TURNS ONLY.

Step 1. Check adjustment of rear wheel bearings.

Adjust rear wheel bearings as required (para 4-75).

Step 2. Refer internal axle malfunctions to direct or general support maintenance.

STEERING

1. STEERING REQUIRES EXCESSIVE EFFORT.

Step 1. Check for low air pressure in tires.

Inflate tires to proper air pressure (45 PSI rear, 100 PSI front).

Step 2. Check for stiffness in tie rod ends, steering knuckles and steering gear due to lack of lubrication.

Lubricate all items in accordance with LO 10-3930-633-12.

Step 3. Check for bent or misaligned tie rod or drag link.

Replace damaged drag link. Refer damaged tie rod to direct or general support maintenance.

2. TRACTOR WANDERS OR WEAVES.

Step 1. Check front wheel toe-in.

Adjust to specifications.

Step 2. Check for loose drag link connections.

Tighten drag link half stud ends to eliminate play in steering linkage.

Step 3. Check for excessive play in front wheel bearings.

Adjust front wheel bearings to specifications.

Step 4. Check for steering gear out of adjustment.

Adjust steering gear to specifications (para 4-87).

Step 5. Check for loose steering gear mounting bolts.

Tighten all steering gear mounting bolts.

3. NOTICEABLE PULL TO ONE SIDE.

Step 1. Check front tires for mismatch, or low air pressure.

Install tires of same size on both wheels. Inflate to 100 PSI (front wheels).

Step 2. Check wheel bearings for tight adjustment.

Adjust wheel bearings to eliminate binding (para 4-75).

Step 3. Check for dragging brake shoe on one side.

Adjust brake to eliminate shoe drag (para 4-79).

Step 4. Refer other defects to direct or general support maintenance.

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