GRABBING BRAKES - TM-9-2330-380-14-P0096

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SLOW BRAKE APPLICATION OR SLOW RELEASE

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TM-9-2330-380-14-P Semitrailer Van: Electronic Tactical 12-Ton 4-Wheel XM1063 (NSN 2330-01-224-9244) and M129A4 (NSN 2330-01-372-5642) Manual

BRAKE DRUM RUNNING HOT

TM 9-2330-380-14&P

Table 4-2. Unit Troubleshooting (cont'd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

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

Ifreturnspringisdefective,notifydirectsupportmaintenance.

If return spring is not defective, proceed to step 4.

Step 4. Check for defective brake chamber.

If brake chamber is defective, replace brake chamber (para. 4-46).

If brake chamber is not defective, proceed to step 5.

Step 5. Check for low pressure.

Perform leakage test. Repair or replace leaking air lines, hoses or connections.

13. GRABBING BRAKES

Step 1. Check brake adjustment.

If brakes are out-of-adjustment, adjust brakes (para. 4-50 (XM1063) or 4-51 (M129A4)).

If brake adjustment is correct, proceed to step 2.

Step 2. Check for grease on brake lining.

If grease is present, replace oil seals (para. 4-52 (XM1063) or 4-53 (M129A4)) and brake

If grease is not present on brake lining, proceed to step 3.

Step 3. Check for loose or worn wheel bearings.

If wheel bearings are loose, adjust wheel bearings (para. 4-52 (XM1063), 4-53 (M129A4)).

If wheel bearings cannot be adjusted, replace wheel bearings.

If wheel bearings are not loose or worn, proceed to step 4.

Step 4. Check for cracked, scored or deformed brake drum.

If brake drum is cracked, scored or deformed, replace brake drum.

If brake drum does not need replacement, proceed to step 5.

Step 5. Check for loose or worn brake lining.

Replace brake shoes.