TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
4.
MAIN FRAME DOES NOT LOAD.
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 (GAH20-1/4 NPT-V)
Wrench, Combination, 1-1/4 in. (GGG-W-636)
START
1.
KNOWN INFO
TEST OPTIONS
Unit troubleshooting
Does the main frame
completed.
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
Directional control valve
an electric solenoid. If
faulty.
the solenoid is faulty, the
Main frame manifold
control valve will not
counterbalance valve(s)
operate. Operating the
faulty.
valve manually deter-
mines if the hydraulic
portion of the valve is
operating correctly.
NO
Go to Step 2.
Replace directional
control valve (para
YES
