TM 5-3810-307-24-1-1
Direct/General Support Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
7. Sticking spool in control
c. Valve warped in mounting.
c. Loosen valve and check.
valve (continued).
d. Relief valve not working
d. Check pressure at inlet and at
properly.
working ports of control valve.
Repair or replace relief valve as
necessary.
e. Handle or linkage binding.
e. Free linkage.
f. Spacer bent.
f. Replace valve.
g. Return spring damaged.
g. Replace faulty parts.
h. Spring or valve cap binding.
h. Loosen, recenter, and retorque
cap.
8. Leaking seals in control
a. Paint on or under seal.
a. Remove and clean as
valve.
necessary.
b. Dirt under seal.
b. Remove and clean as
necessary.
c. Scored spool.
c. Replace valve.
d. Loose seal plates.
d. Clean and tighten plates.
e. Cut or scored seal.
e. Replace damaged seals.
9. Unable to move control
a. Dirt in valve.
a. Clean and flush out valve
valve spool in or out.
assembly.
b. Spool cap full of oil.
b. Replace seals.
c. Linkage binding.
c. Free linkage.
10. Load drops when
a. Dirt in check valve.
a. Disassemble and clean check
control valve is moved
valve.
from neutral.
b. Scored check valve poppet
b. Replace poppet or lap poppet
or seat.
to seat.
c. Motor control valve out of
c. Contact Grove Worldwide,
adjustment.
Product Support for valve
adjustment.
HOIST MOTOR
1. External leakage.
a. Seal failure.
a. Replace seal.
b. Defective casting.
b. Replace casting.
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