HOIST OPERATION SLOW OR ABNORMAL WHEN LIFTING OR LOWERING LOAD.

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)

5. HOIST OPERATION SLOW OR ABNORMAL WHEN LIFTING OR LOWERING LOAD.

Step 1. Check that ENGINE HIGH IDLE assembly increases engine speed to 1500 50 rpm

(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. Check for faulty hydraulic system operation.

Refer to HYDRAULIC SYSTEM Troubleshooting.

If problem remains, notify the supervisor.

Step 3. Check for clogged high pressure hydraulic filter (para 19-17).

Service filter (para 19-17).