Product Manual

CHAPTER VII
Motor Maintenance
Motors, properly selected and installed, are capable of operating for
many years with a reasonably small amount of maintenance.
Before servicing a motor and motor-operated equipment, disconnect
the power supply from motors and accessories. Use safe working
practices during servicing of the equipment.
Clean motor surfaces and ventilation openings periodically, preferably
with a vacuum cleaner. Heavy accumulations of dust and lint will result
in overheating and premature motor failure.
Lubrication Procedure
Motors 10 HP and smaller are usually lubricated at the factory to operate
for long periods under normal service conditions without re-lubrication.
Excessive or too frequent lubrication may actually damage the motor.
Follow instructions furnished with the motor, usually on the nameplate
or terminal box cover or on a separate instruction. If instructions are
not available, re-lubricate according to the chart on the next page.
Use high-quality ball bearing grease. Grease consistency should be
suitable for the motor’s insulation class. For Class B, F or H, use a medium
consistency polyurea grease such as EXXON POLYREX
®
EM.
If the motor is equipped with lubrication fitting, clean the fitting tip, and
apply grease gun. Use one to two full strokes on NEMA 215 frame and
smaller motors. Use two to three strokes on NEMA 254 through NEMA
365 frame. Use three to four strokes on NEMA 404 frames and larger.
For motors that have grease drain plugs, remove the plugs and operate
the motor for 20 minutes before replacing the plugs.
For motors equipped with slotted head grease screws, remove the
screw and insert a two-inch to three-inch long grease string into each
hole on motors in NEMA 215 frame and smaller.
Insert a three-inch to five-inch length on larger motors. For motors
having grease drain plugs, remove the plug and operate the motor for
20 minutes before replacing the plugs.
-61-