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 199 of 712

OPERATOR MAINTENANCE

MAST RAISES OR LOWERS SLOWLY

INITIAL SETUP:

Equipment Condition

Vehicle setup for crane operations.

(Volume 1, WP 0106)

TROUBLESHOOTING PROCEDURE

MAST RAISES OR LOWERS SLOWLY

TEST 1 - Does mast raise and lower normally after running engine for 20 minutes with

PTO engaged?

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.

If outside temperature is 0°F (-17°C), hydraulic fluid may not flow easily.

1.

If loaded, set load down and disconnect load hook.

2.

Operate engine (Volume 1, WP 0044) for 20 minutes with PTO ENGAGE switch set

to ON to bring hydraulic fluid up to operating temperature.

TM 9-2320-431-10-2

0164

0164-1