SWING OPERATION SLOW OR ABNORMAL IN ONE OR BOTH DIRECTIONS.

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)

7. SWING OPERATION SLOW OR ABNORMAL IN ONE OR BOTH DIRECTIONS.

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 WILL NOT OPERATE.

Step 2. Check for faulty hydraulic sytem operation.

Refer to HYDRAULIC SYSTEM Troubleshooting.

Step 3. Check for insufficient lubrication on turntable bearing.

Lubricate turntable bearing (LO 9-2320-279-12).

Step 4. Check oil level in swing drive gear case (LO 9-2320-279-12).

Add oil if necessary (LO 9-2320-279-12).

Step 5. Check for loose or missing turntable bearing screws (Table 2-2).

Tighten turntable bearing screws (Table 2-2) and notify the supervisor if there are

any missing screws.

8. DELETED.

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