TM 5-3895-346-14
TROUBLESHOOTING
HYDROSTATIC SYSTEM
CAUSE
INDICATED BY
REMEDY
B.
Faulty high-
Loss of or lower than
1. Switch the two high-
pressure relief
normal system pressure
pressure relief valves. If
valve
in one direction only
the system operates in the
direction which it would
not operate before, one of
the relief valves is in-
operative. Repair or replace
damaged valve. Retest system.
C.
One check valve
Loss of system pres-
1. Remove the two check
faulty
sure in one direction
valves located in the pump
only. Charge pressure
end cap under the charge
might be higher than
pump and check the following:
normal
(Refer to Repair Procedure.)
A. Check to see if poppet
or ball is missing.
B. Check to see if the valve
seat is eroded or deformed.
NOTE
If condition (A) exists,
replace the pump. If
condition (B) exists, re-
place both check valves.
D.
Control valve
Pump will not return to
1. Replace control valve.
spool jammed or
neutral
(Refer to Repair Procedure.)
sticking in one
direction or
misadjusted
E.
Shuttle valve
Loss of or lower than
1. Remove and replace mani-
spool jammed
normal system pressure
fold assembly. (Refer to
(located in
in one direction
Repair Procedure.)
motor manifold)
III.
NEUTRAL DIFFICULT OR IMPOSSIBLE TO FIND
CAUSE
INDICATED BY
REMEDY
A.
Faulty linkage
1. Disconnect control link-
age at directional control
arm. If system now returns
to neutral, the linkage to
the control is out of adjust-
ment or binding in some way.
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