TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
4.
MAIN FRAME DOES NOT LOAD (continued).
TEST OPTIONS
KNOWN INFO
3.
Counterbalance Valve
Unit troubleshooting
Does the main frame
Test.
completed.
load after the counter-
Other LHS functions OK.
balance valves are
REASON FOR QUESTION
Directional control valve
reversed on the right
OK.
main frame cylinder
If the main frame cylinder
manifold?
manifold counterbalance
POSSIBLE PROBLEMS
valve(s) sticks in the
Main frame manifold
closed position, hydraulic
counterbalance valve(s)
fluid will be trapped in the
faulty.
hydraulic cylinder, which
will hydrolock the cylinder.
Repair LHS main
frame cylinder
NO
manifold (para 5-24).
Repair RH main
frame cylinder
YES
manifold (para 5-24).
5-26
