TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
2.
HOOK ARM DOES NOT LOAD (continued).
TEST OPTIONS
KNOWN INFO
3.
Counterbalance Valve
Unit troubleshooting
Does the hook arm
Test.
completed.
load after the counter-
Other LHS functions OK.
balance valves are
REASON FOR QUESTION
Directional control valve
reversed on the left
OK.
hook arm cylinder
If the hook arm cylinder
manifold?
manifold counterbalance
POSSIBLE PROBLEMS
valve(s) stick in the closed
Hook arm manifold
position, hydraulic fluid will
counterbalance valve(s)
be trapped in the hydraulic
faulty.
cylinder, which will hydro-
lock the cylinder.
Repair RH hook arm
cylinder manifold
NO
Repair LH hook arm
cylinder manifold
YES
5-14
