Shop Manual

20-117
Troubleshooting (Turning Motor)
Fault Cause Troubleshooting
Motor doesn’t run 1. Dust or the oil is too dirty, radial load of
shaft and shaft sleeve is too large and
motor is clogged.
2. No pressure.
3. Motor internal leak.
1. Turn the motor and test the
oil pressure.
2. Check the pumps and valves in
the entire circuit.
3. Exchange the motor
The rotation speed of
motor is different with
the setting value
1. The oil of motor is not enough.
2. The axle temperature increases and
hydraulic oil leaks and the viscidity
reduce.
1. Check the flow rate of pump
and motor, check the output
volum in idling condition and
check the drain flow of
valves.
2. Use the oil with normal
viscidity or use the normal oil
temperature to drive.
The rotation speed of
motor is deviated
1. Pipeline is wrong.
2. Speed adjusting is wrong.
1. Adjust pipeline
2. Change speed adjusting
(means the re-installed items)
Shaft seal leaks 1. Sealing elements were worn or damaged 1. Change sealing elements.
Leak between flange
and flange surface
1. The flange connection is too loose.
2. The O ring between flange and flange
surface is damaged or the flange is
damaged.
3. The connection seal leaks oil.
1. Re-tight (tightening torque:
26-32 Nꞏm)
2. Check O-ring for scratch or
bur and check the working
surface of O-ring on the
flange surface.
3. Change O-ring.
Leak from rear cover 1. The bolt of bottom cover has loosened.
2. The O-ring is worn or damaged.
3. Contacting area has dirt.
4. Contacting area has concave slot or
crack.
1. Tight 7 bolts (Tightening
torque: 32-35 Nꞏm);
2. Replace O-ring;
3. Clean and reassemble it.
4. Grind the contacting area
with 6# sand paper to smooth
it.
The installed flange
have crack (4 bolted
flanges)
1. Result from the installation method 1. Change flange or use the
normal bolt to tight.
Holes leak 1. Improper connection
2. Screw is damaged
3. Flange surface has crack
1. Re-connect
2. Change flange surface.
Abnormal sound 1. The axle is installed wrongly;
2. Air in the pipeline or motor;
3. Pump has clearance
4. Motor has clearance
5. Air in the oil inlet pipe
1. Reinstall
2. Exhaust
3. Exchange pump
4. Exchange motor
5. Exhaust
Abnormal temperature
raise
1. Cooling system is abnormal;
2. The capacity of oil tank is not enough
3. The pressure is too high
4. Using swing mechanism frequently
1. Check and repair cooler;
2. Increase capacity or cooler
3. Adjust the overflow valve to
normal pressure.