TM 5-5420-234-14&P
5-2. DIRECT SUPPORT TROUBLESHOOTING (continued).
5.
LHS CREEPS UNDER LOAD (continued).
4.
TEST OPTIONS
KNOWN INFO
Visual inspection.
Hook arm OK.
Does the main
Main frame creeps in
frame creep in the
REASON FOR QUESTION
only one direction.
unload direction?
The transit valves in port CA
POSSIBLE PROBLEMS
of the main frame manifolds
relieve hydraulic pressure on
Main frame manifold
the back side of the hydrau-
faulty.
lic cylinder piston in the
transit mode. The counter-
balance valves in port CA of
the manifolds close and
prevent further hydraulic
cylinder extension when no
system pressure is present.
If the main frame creeps in
the unload direction, one or
both of these valves is stuck
open or leaking.
Go to Step 5.
NO
Repair main frame
YES
manifold (para 5-
5-34
