TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
5.
LHS CREEPS UNDER LOAD.
INITIAL SETUP
Tools and Special Tools
Equipment Condition
Tool Kit, General Mechanic's: Automotive
Engine turned off (TM 9-2320-279-10)
(SC 5180-90-N26)
Parking brake applied (TM 9-2320-279-10)
Wheels chocked (TM 9-2320-279-10)
START
1.
TEST OPTIONS
KNOWN INFO
Visual inspection.
None.
Does the hook arm
creep in the load
REASON FOR QUESTION
POSSIBLE PROBLEMS
direction?
The counterbalance valves in
Hook arm manifold faulty.
port CB of the hook arm
Proximity switch faulty.
manifolds close and prevent
Transit valve control
further hydraulic cylinder
circuit faulty.
retraction when no system
Main frame manifold
pressure is present. If the
faulty.
hook arm creeps in the load
direction, one or both of
these valves is stuck open or
leaking.
Go to Step 2.
NO
Repair hook arm
YES
manifolds (para 5-
