TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
2.
HOOK ARM DOES NOT LOAD.
INITIAL SETUP
Tools and Special Tools
Union, Pipe to Tube (GAH20-1/4 NPT-V)
Adapter, Straight, Pipe to Tube (TCM20-1/2JIC-V)
Wrench, Combination, 1-1/4 in. (GGG-W-636)
Gage, Pressure, Dial Indicating (151469)
Hose Assembly, Nonmetallic (HFF20-060)
Equipment Condition
Pan, Drain, 4-gallon (MIL-P-45819)
BAP unloaded to ground (para 2-10)
Tee, Tube (203102-8-8S)
Engine turned off (TM 9-2320-279-10)
Tool Kit, General Mechanic's: Automotive
Parking brake applied (TM 9-2320-279-10)
(SC 5180-90-N26)
Wheels chocked (TM 9-2320-279-10)
START
1.
KNOWN INFO
TEST OPTIONS
Unit troubleshooting
Does the hook arm
completed.
load when the
REASON FOR QUESTION
Other LHS functions OK.
hydraulic control
solenoid is manually
During normal operation,
POSSIBLE PROBLEMS
bypassed?
the directional control valve
spool is actuated by an
Directional control valve
electric solenoid. If the
faulty.
solenoid is faulty, the
Hook arm manifold
control valve will not oper-
counterbalance valve(s)
ate. Operating the valve
faulty.
manually determines if the
hydraulic portion of the
valve is operating correctly.
NO
Go to Step 2.
Replace directional
control valve (para
YES
