Troubleshooting, Testing And Adjustment - Doosan DX300LCA Instructions Manual

TROUBLESHOOTING, TESTING
AND ADJUSTMENT
Symptoms
1. No rotation and –
a. Pressure at swing motor inlet
increases
b. Pressure at swing motor inlet
shows no increase, and the swing
motor is making irregular noises
c. Pressure at swing motor inlet shows
no increase, but without irregular
noises from the swing motor
2. Oil leakage
a. From drive shaft
b. From bolted connections or other
assembled surfaces
3. Excess heat
Gearbox casing becomes excessively
hot, with or without irregular noise(s)
during operation
Swing Reduction Gear
Page 10
Possible Causes
Swing brake not releasing
Internal damage to gearbox
drive train
Overload
Swing motor drive shaft damage
Internal damage to gearbox
drive train
Hydraulic pump or valve broken
Oil seal damaged
Assembly compound (joint sealer)
old and not sealing, bolt not tight
or flange warped
Low oil level
Bearings or gear worn but not
completely inoperative
Remedies
Check brake engagement
and disengagement,
check release pressure
Replace broken gears,
drive train assemblies
Reduce load weight
Replace swing motor
Repair/replace broken or
faulty assemblies
Troubleshoot hydraulic
system
Replace oil seal
Disassemble and check
mating surfaces. Reapply
Loctite, torque bolts to
specifications
Replace oil, refill to
specified level
Repair or replace
gearbox
HAOE960L
SP002028