MH860 series hydraulic servo drive
Maintenance and inspection
112
9.4 Replacement of wearing parts
9.4.1 Service life
The wearing parts of drive mainly include the cooling fan and electrolytic capacitor for filtering,
whose service life is closely related to the running environment and maintenance condition.
The following table lists the service life of the wearing parts, which can be replaced based on
the accumulative run time.
Part
Service life
Test condition
Fan
≥ 5 years
Ambient temperature: 40°C
Load rate: 80%
Run time: 24 hours/day
Electrolytic
capacitor
≥ 5 years
9.4.2 Replacement
The fan or electrolytic capacitor that reaches the service life or has a damage needs to be
replaced in time to avoid affecting the normal use of drive. The following table lists the
replacement criteria and method.
Part
Symptom
Criteria
Replacement method
Fan
The shaft bearing is much
worn out, the blades are
aging, or the blades do not
run.
The blades have
cracks.
There are abnormal
noises or vibrations.
Loosen the screws,
remove the fan cover,
and pull it outward.
After replacement,
ensure that the wind
blows outward.
Electrolytic
capacitor
There is liquid outflow, the
safety valve is loose, or the
electrostatic capacitance
value changes.
There is breakage in
the exterior, the safety
valve is loose, or the
electrostatic
capacitance value
changes.
Do not replace the
electrolytic capacitor
by yourself since drive
internal components
are related. Please
contact the supplier for
the replacement.
