CompAir 5280D.1.IAC Operator's Handbook Manual page 129

CompAir UK Ltd
PUBLICATION APP034 ELECTRIC MOTOR MAINTENANCE GENERAL
Page 1
ELECTRIC MOTOR MAINTENANCE
WARNING :
Isolate power supply to motor before commencing any routine cleaning or maintenance work.
Routine Cleaning :
Remove the fan cover and ensure that all holes are completely open. Clear any dirt and fluff from behind the
fan and along the ribs of the frame.
Periodic Maintenance :
Remove the cover and the fan which is fitted on the shaft extension.
Slacken and remove bearing cover screws and endshield bolts/studs. The endshields should then be eased
off their spigots.
The rotor can now be withdrawn carefully from the stator.
Having dismantled the motor, maintenance can now be carried out to remove all dirt. Dry, compressed air
under comparatively low pressure is best as a high velocity stream can force dirt into the spaces between
windings, etc.
Grease removing solvents should only be used very sparingly so as not to damage impregnating varnish or
insulation.
Bearings are charged with sufficient grease to last at least two years, provided there is little or no grease
leakage. When replenishing, use only good quality lithium based grease and avoid overfilling the bearing
housing.
Motors should be reassembled in the reverse order from dismantling, taking care not to damage the
windings on insertion of rotor, taking care not to damage the windings on insertion of rotor, remembering to
ease endshields on bearings and spigots. DO NOT USE FORCE.
Before starting, check that the rotor revolves freely. Ensure that the electrical connections are correct and
terminal nuts tight.
Refit any pulley, coupling, sprocket etc. which have been removed, being particularly careful to ensure
correct alignment with the driven part, as misalignment may lead to ultimate bearing failure and shaft
breakage.
app034.doc