SP000032Travel Motor
Page 18
TROUBLESHOOTING, TESTING
AND ADJUSTMENT
General Precautions
1. Observe any abnormalities and any possible causes that
have noting to do with the motor before starting work.
2. Make sure that no foreign substance is involved when
disassembling the machine, which is the most frequent
cause of its wear.
3. Treat carefully and pay attention to avoid any damage
against it that is machined precisely.
How to Check Faults of Hydraulic Motor
1. Remove the drain plug and check oil in the case. Too
much chips and metal dust in oil causes the possible wear
of parts in the motor.
2. Abnormal noise. Check any abnormal noise from the main
body of the motor.
3. Pressure measurement at each part. Check any possible
faults by measuring circuit pressure up to the hydraulic
motor before disassembling the motor.
Troubleshooting
Problem Possible Cause Remedy
Abnormal operation of driving devices.
Motor pressure does not
increase.
Oil bypassing in relief valve (350). Replace or repair relief valve.
Check spring broken. Replace check spring.
Valve spring of counterbalance
valve broken.
Replace the valve spring of
counterbalance valve.
Crack in channel in valve casing. Replace valve casing.
Abnormal wear on check surface. Replace check.
Excessive clearance between valve
casing and counterbalance spool.
Replace valve casing and/or
counterbalance spool.
Coupling of deceleration assembly
damaged.
Disassemble deceleration assembly and
replace the coupling.
Pressure increases but
hydraulic motor does not
rotate.
Orifice screw (363) blocked. Wash or replace orifice screw.
Piston ring (707 and 708) damaged. Replace piston ring.
Friction and/or separation plates
stuck.
Replace friction and/or separation plates.
Slideway stuck. Replace stuck slideway.
Orifice screw in counterbalance
spool blocked.
Wash or replace orifice screw.
Gear of deceleration assembly
damaged.
Disassemble deceleration assembly and
replace the gear.
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