16
Inspection & Maintenance
• Inspect the motor at regular intervals, approximately every 500 hours of operation or
every 3 months, whichever occurs first.
• The following steps should be performed at each inspection:
–
Turn off the fan motor, and follow the required lockout/tagout procedure.
–
Check that the motor is clean. Check that the exterior fins of the motor are free of
dirt, oil, grease, etc. If the motor is not properly ventilated, overheating can occur
and cause early motor failure.
–
Perform a dielectric withstand insulation test periodically to ensure that the integrity
of the winding insulation has been maintained. Record the readings. Immediately
investigate any significant decrease in insulation resistance.
–
Check all electrical connections to be sure that they are tight.
Relubrication & Bearings
• Bearing grease will lose its lubricating ability over time, not suddenly.
• The lubricating ability of a grease (over time) depends primarily on the type of grease,
the size of the bearing, the speed at which the bearing operates and the severity of the
operating conditions.
• Good results can be obtained if the following recommendations are followed in your
maintenance program.
Lubrication Procedure
• Relubrication is recommended with the shaft stationary and a warm motor.
• Wipe all dirt from the outside of the grease fills and drains.
• Locate the grease inlet at the top of the bearing hub, clean the area and replace the
1/8” pipe plug with a grease fitting if the motor is not equipped with grease fitting.
• Remove grease drain plug located opposite the grease inlet.
• Using a manual grease gun, pump in the recommended grease in the amount shown
in
Table 2
. This amount of grease will provide an ample supply of lubricant between
lubrication intervals. Use only clean, fresh grease from clean containers and handle
so as to keep it clean. In general, mixing of greases is not recommended. If an
incompatible grease is used, the lube system must be repacked completely with the
new grease.
• Wipe away any excess grease at the grease drain or relief and replace drain plugs.
• Follow the relubrication interval given in
Table 2
(or sooner) unless otherwise specified
on the motor lubrication nameplate.
• Lubrication interval is based upon maximum ambient temperature of 40°C and a
minimum air flow of 750ft/min over the motor.
• Motors are shipped from the factory with full grease cavities and ready for operation.
Table 2.
Type of Grease, Relubrication Amount, and Interval
Motor Frame
Size
Grease Type
Vol. in Cubic in
3
(cm
3
)
Weight oz (g)
Relubrication
Interval
(hrs)
FL320y
Mobilith SHC460
2 (32)
1.0 (28)
17,500
FL360y
Mobilith SHC460
2.5 (40)
1.25 (35)
FL400y
Mobilith SHC460
2.5 (40)
1.25 (35)
17,500
17,500
