TM 5-3810-307-24-1-1
Direct/General Support Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
2. Boom lowers erratically.
a. Circuit and/or main relief
a. Repair or replace relief valve.
valve inoperative.
b. Control valve linkage out of
b. Adjust linkage to obtain full
adjustment.
spool travel.
c. Damaged hydraulic pump
c. Repair or replace pump section.
section.
3. Boom raises slowly.
a. Damaged relief valve.
a. Repair or replace relief valve.
b. Improper hose or fittings
b. Install proper hose or fittings.
installed.
c. Control valve linkage out of
c. Adjust linkage to obtain full
adjustment.
spool travel.
d. Cylinder piston seals
d. Replace all cylinder seals.
leaking.
e. Hone or replace barrel.
e. Scored cylinder barrel.
f. Repair or replace pump section.
f. Worn hydraulic pump
section.
4. Boom lowers slowly.
a. Damaged relief valve.
a. Repair or replace relief valve.
b. Improper hose or fittings
b. Install proper hose or fittings.
installed.
c. Control valve linkage out of
c. Adjust linkage to obtain full
adjustment.
spool travel.
d. Cylinder piston seals
d. Replace all cylinder seals.
leaking.
e. Hone or replace barrel.
e. Scored cylinder barrel.
f. Replace piston rod and all
f. Piston rod broken (loose
cylinder seals.
from piston).
g. Repair or replace pump section.
g. Worn hydraulic pump
section.
5. Boom will not raise.
a. Main and/or circuit relief
a. Repair or replace relief valve.
valve damaged.
b. Improperly adjusted control
b. Adjust linkage to obtain full
valve linkage.
valve spool travel.
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