TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
1.
HOOK ARM DOES NOT UNLOAD (continued).
2.
TEST OPTIONS
KNOWN INFO
Unit troubleshooting
Hook Arm Unload
Are 3,1003,300 psi
completed.
Pressure Test.
present at the hook arm
Other LHS functions OK.
manifolds during un-
REASON FOR QUESTION
loading?
POSSIBLE PROBLEMS
If the correct hydraulic
pressure is measured at
Directional control valve
the hook arm hydraulic
faulty.
cylinders, the control
Hook arm manifold
portion of the hydraulic
counterbalance valve(s)
circuit is OK.
faulty.
Replace directional
control valve (para
NO
YES
5-6
