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 297 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

MATERIAL HANDLING CRANE (M977, M985, M984E1) (CONT)

9. CRANE CONTROLS STICKING.

Step 1. Check high pressure hydraulic filter for contamination.

If contamination is found, determine cause of contamination. Drain reservoir,

replace strainers (para 13-11) (M984E1: para 13-15), change high pressure filter

(para 19-17) and return line filter (para 13-8) (M984E1: para 13-13). Fill with oil

(LO 9-2320-279-12), then purge system by operating crane (TM 9-2320-279-10).

Step 2. If problem remains, notify the supervisor.

10. REMOTE CONTROLLER WILL NOT OPERATE CRANE OR OPERATES ABNORMALLY.

Step 1. Make a visual check of remote controller cable for loose connectors.

Tighten loose connectors. Replace remote controller cable if there are more than

two broken wires.

Step 2. Check each wire in remote controller cable for zero ohms between both ends of cable.

If meter does not show zero ohms in any wire, repair defective wire.

If more than two wires are defective, repair remote controller cable (para 17-23.1).

2-204