TM-9-2330-238-14

CHASSIS, SEMITRAILER: 6-TON, 4-WHEEL M295A1; SEMITRAILER, VAN: EXPANSIBLE, 6-TON, 4-WHEEL M313; SEMITRAILER, VAN: SHOP, FOLDING SIDES, 6-TON, 4-WHEEL M447 AND M447C; SEMITRAILER, VAN: REPAIR PARTS, SHOP EQUIPMENT, 6-TON, 4-WHEEL M749; SEMITRAILER, VAN: REPAIR PARTS STORAGE, 6-TON, 4-WHEEL M750

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1992

TM-9-2330-238-14 - Page 112 of 462

TM 9-2330-238-14

Table 4-2. Organizational Troubleshooting (Con’t).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 7.

Check for defective master cylinder.

Replace defective master cylinder (para 4-41).

Step 8.

Check for defective wheel cylinder.

Replace defective wheel cylinder (para 4-39).

15. BRAKES GRAB.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Check for moisture in air filters or air reservoir.

Drain moisture from air filters or air reservoir.

Check for proper brake adjustments.

Adjust brakes (para 4-36).

Check for defective relay valve.

Perform operating test (para 4-44). If necessary, replace relay valve (para 4-44).

Check for contaminated brakeshoe linings.

Clean brakedrum and brake components. If necessary, replace brakeshoe (para 4-38) and

oil seal (para 4-48).

Check for cracked, scored, or deformed brakedrum.

Replace defective brakedrum (para 4-48).

Check for loose or worn brakeshoe linings.

Replace defective brakeshoes (para 4-38).

Check for loose or worn wheel bearings.

Adjust wheel bearings (para 4-48). If wheel bearings cannot be adjusted, replace wheel

bearings (para 4-48).

16. BRAKEDRUM RUNNING HOT.

Step 1.

Check to see if brakes are adjusted properly.

Adjust brakes (para 4-36).

Step 2.

Check for weak or broken brakeshoe return springs.

Replace defective brakeshoe return springs (para 4-38).

Step 3.

Check for cracked, scored, or worn brakedrum.

Replace defective brakedrum (para 4-48).

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