TM-9-2320-338-10

TRUCK, CARGO, 8X8, M977A4

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008

TM-9-2320-338-10 - Page 733 of 1120

OPERATOR MAINTENANCE

CRANE WILL NOT OPERATE, OR OPERATES ABNORMALLY

INITIAL SETUP:

Equipment Condition

Engine OFF. (WP 0057)

Parking brakes applied. (WP 0056)

Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE

CRANE WILL NOT OPERATE, OR OPERATES ABNORMALLY

TEST 1 - Is electrical connector on solenoid tight?

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.

Check that electrical connector on solenoid valve is tight. If connector is loose, tighten.

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