TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
3.
MAIN FRAME DOES NOT UNLOAD.
INITIAL SETUP
Tools and Special Tools
Equipment Condition
Adapter, Straight, Pipe to Tube (TCM20-1/2JIC-V)
BAP unloaded to ground (para 2-10)
Gage, Pressure, Dial Indicating (151469)
Engine turned off (TM 9-2320-279-10)
Hose Assembly, Nonmetallic (HFF20-060)
Parking brake applied (TM 9-2320-279-10)
Pan, Drain, 4-gallon (MIL-P-45819)
Wheels chocked (TM 9-2320-279-10)
Tool Kit, General Mechanic's: Automotive
(SC 5180-90-N26)
Union, Pipe to Tube (GAH 20-1/4 NPT-V)
Wrench, Combination, 1-1/4 in. (GGG-W-636)
START
1.
KNOWN INFO
TEST OPTIONS
Unit troubleshooting
Does the main frame
completed.
unload when the
REASON FOR QUESTION
Other LHS functions OK.
hydraulic control
solenoid is manually
During normal operation, the
POSSIBLE PROBLEMS
bypassed?
directional control valve spool
is actuated by an electric
Directional control valve
solenoid. If the solenoid is
faulty.
faulty, the control valve will
Main frame manifold
not operate. Operating the
counterbalance valve(s)
valve manually determines if
faulty.
the hydraulic portion of the
valve is operating correctly.
NO
Go to Step 2.
Replace directional
control valve (para
YES
5-25).
