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 250 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

FRONT AND REAR AXLE TANDEMS (CONT)

2. DIFFERENTIAL LOCK-UP DOES NOT ENGAGE OR DISENGAGE.

Step 1. Check for broken or kinked air line tubing or loose connections at No. 2 and No. 3 axles.

Replace broken or kinked air line tubing.

Tighten loose connection.

Step 2. Go to AIR SYSTEM Troubleshooting, MALFUNCTION 16, AXLES WILL NOT LOCK UP.

Step 3. If problem is not solved, notify the supervisor.

TRANSMISSION

1. TRANSMISSION OIL TEMPERATURE GAGE CONTINUOUSLY READS OVER 250 °F.

Step 1. Check transmission fluid level (LO 9-2320-279-12).

Add or drain transmission fluid as required (LO 9-2320-279-12).

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