TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
3.
MAIN FRAME DOES NOT UNLOAD (continued).
TEST OPTIONS
3.
KNOWN INFO
Counterbalance Valve
Unit troubleshooting
Does the main frame
Test.
completed.
unload after the
Other LHS functions OK.
counterbalance valves
REASON FOR QUESTION
Directional control valve
are reversed on the
OK.
right main frame
If the main frame cylinder
cylinder manifold?
manifold counterbalance
POSSIBLE PROBLEMS
valve(s) stick in the closed
Main frame manifold
position, hydraulic fluid will
counterbalance valve(s)
be trapped in the hydraulic
faulty.
cylinder, which will hydro-
lock the cylinder.
Repair LH main frame
cylinder manifold
NO
Repair RH main frame
cylinder manifold
YES
5-20
