TM-9-2320-338-10

TRUCK, CARGO, 8X8, M977A4

TECHNICAL MANUAL; OPERATOR'S MANUAL

OCTOBER 2008

TM-9-2320-338-10 - Page 747 of 1120

OPERATOR MAINTENANCE

MAST RAISES OR LOWERS ABNORMALLY

INITIAL SETUP:

Equipment Condition

Vehicle setup for crane operations.

(WP 0038)

TROUBLESHOOTING PROCEDURE

MAST RAISES OR LOWERS ABNORMALLY

TEST 1 - Does mast raise and lower normally after cycling mast up and down to

remove trapped air?

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.

Fully raise and lower mast (WP 0038) several times to remove air from cylinders.

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