TM 5-3810-307-24-1-1
Direct/General Support Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
1. Boom swing operation
c. Excessive preload on upper
c. Adjust as necessary.
erratic in either direction
and lower pinion shaft
(continued).
bearing.
d. Defective swing box.
d. Remove and repair swing box
as necessary.
e. Worn or damaged pump
e. Repair or replace damaged
section.
section.
f. Damaged pressure reducing
f. Repair or replace valve.
valve.
2. Boom swing operation
Damaged swing pinion.
Replace swing pinion.
erratic in one direction
only.
3. Boom will not swing in
a. Damaged relief valve.
a. Remove, clean, and repair or
either direction.
replace relief valve.
b. Damaged swing motor.
b. Repair or replace swing motor.
c. Swing brake not releasing
c. Repair brake as necessary.
properly.
d. Defective swing box.
d. Remove and repair swing box
as necessary.
e. Worn or damaged pump
e. Repair or replace damaged
section.
section.
f. Inoperative pressure
f. Replace valve.
reducing valve.
4. Swing operation slow in
a. Damage relief valve.
a. Remove, clean, and repair or
either direction.
replace relief valve.
b. Improperly adjusted swing
b. Readjust brake.
brake.
c. Improperly adjusted
c. Adjust valve, refer to Chapter 2,
pressure reducing valve.
Section 8.
d. Worn or damaged output
d. Replace bearings.
shaft bearings.
e. Worn or damaged swing
e. Repair or replace swing motor.
motor.
1-5-20
