TM-9-2320-338-10

TRUCK, CARGO, 8X8, M977A4

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008

TM-9-2320-338-10 - Page 737 of 1120

OPERATOR MAINTENANCE

HOIST OPERATION SLOW OR ABNORMAL WHEN LIFTING OR LOWERING LOAD

INITIAL SETUP:

Equipment Condition

Vehicle setup for crane operations.

(WP 0038)

TROUBLESHOOTING PROCEDURE

HOIST OPERATION SLOW OR ABNORMAL WHEN LIFTING OR LOWERING LOAD

TEST 1 - Does hoist operate normally after removing air from motor?

CAUTION

Be sure to keep tension on cable. If tension is not maintained, cable may

get tangled on drum.

NOTE

Common problems that crane operators may see are:

1.

Slow or abnormal operation.

2.

Crane will not pick up load.

Common causes of problems are:

1.

Cold hydraulic fluid (slow operation).

2.

Low engine speed (slow or abnormal operation).

3.

Operating two craning functions at the same time (slow operation).

4.

Load too heavy (crane will not pick up load).

5.

Air in cylinder or hoist motor (abnormal operation).

Report all problems to organizational maintenance.

1.

Set load down (WP 0038) and disconnect load hook.

2.

Reel cable in and out several times to remove air from hoist motor.

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