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 193 of 712

OPERATOR MAINTENANCE

MAST RAISES OR LOWERS ABNORMALLY

INITIAL SETUP:

Equipment Condition

Vehicle setup for crane operations.

(Volume 1, WP 0106)

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 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.

Fully raise and lower mast (Volume 1, WP 0106) several times to remove air from

cylinders.

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