TM-9-2320-431-10-2

TRUCK, WRECKER, 8X8, M984A1

TECHNICAL MANUAL; OPERATOR'S MANUAL; PART 2 OF 2

JUNE 2009

TM-9-2320-431-10-2 - Page 163 of 712

OPERATOR MAINTENANCE

BOOM WILL NOT RAISE OR LOWER

INITIAL SETUP:

Equipment Condition

Vehicle setup for crane operations.

(Volume 1, WP 0106)

TROUBLESHOOTING PROCEDURE

BOOM WILL NOT RAISE OR LOWER

TEST 1 - Does boom operate after checking for overloading?

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 oil (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 (will not pick up load).

5. Air in cylinder or hoist motor (abnormal operation).

Report all problems to field level maintenance.

1.

Check that load is not over load limit. If load is found to be over limit, reduce weight

to below load limit.

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