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 288 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cent)

Tafde 2-9. Troubleshootbg (Conf)

Malfunction

Test or Inspection

Corrective Action

MATERIAL HANDLING CRANE (M983) (CONT)

1.

CRANE DOES NOT FUNCTION (CONT).

Step 1. Check position of selector valve on fender (TM 9-2320-279-10).

Put selector valve in proper position (TM 9-2320-279-10).

Step 2. Check selector valve for leaks or damage.

Replace selector valve if leaking or damaged (para 19-14).

Step 3. Go to HYDRAULIC SYSTEM Troubleshooting and make checks shown for

MALFUNCTIONS 1 and 2.

2.

CRANE BOOM MOVES SLOWLY.

ENGINE HIGH

IDLE ASSEMBLY

TA1 88050

Step 1. Check that ENGINE HIGH IDLE assembly changes engine speed to 1500

t 50 rpm when

engaged (TM 9-2320-279-10).

If engine speed does not increase to 1500 ~ 50 rpm, refer to ENGINE

Troubleshooting, MALFUNCTION 6, ENGINE HIGH IDLE DOES NOT OPERATE.

Step 2. Go to HYDRAULIC SYSTEM Troubleshooting and make checks shown for

MALFUNCTIONS 1 and 2. Return to this section if problem is not fixed.

2-195