TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 267 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cent)

12-15. TROUBLESHOOTING INSTRUCTIONS [CONT). [

Table 2-9. Troubleshooting (Conf)

Malfunction

Test or Inspection

Corrective Action

DUAL AIR BRAKE SYSTEM (CONT)

10. FRONT AXLE PARKING BRAKES WILL NOT RELEASE (M984E1 ).

788

TOP VIEW

AUXILIARY FRONT BRAKE

5

Step 1. Remove cover from auxiliary front brake valve (para 11-2 1.2). Release front axle parking

brakes (TM 9-2320-279-10). Loosen line 789 at air brake valve.

If air comes out of air brake valve, replace air brdke valve (para 11-21.2).

Step 2. Release spring brakes (TM 9-2320-279-10). Loosen line 788 at inversion valve.

If air comes out of inversion valve, replace inversion valve (para 11-21 .2).

WHEELS AND TIRES

1.

TIRE UNEVENLY WORN.

Step 1. Check wheel bearings for looseness.

Adjust wheel bearings (para 12-2 or 12-3), replace if damaged (para 12-2 or 12-3).

Lubricate wheel bearings as required (LO 9-2320-279-12).

Step 2. Check for damaged tie rods or drag links.

Replace damaged tie rods (para 13-5).

Replace damaged drag links (para 13-4).

Step 3. Notify the supervisor for wheel alinement.

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