greasing intervals. Keep the motor clean and the ven-
tilation opening clear. The following steps should be
performed at each inspection:
1. Check that the motor is clean. Check that the in-
terior and exterior of the motor is free of dirt, oil,
grease, water, etc. This can accumulate and block
motor ventilation. If the motor is not properly
ventilated over heating can occur and can cause
early motor failure.
2. Use “Megger” periodically to ensure that the in-
tegrity of the winding insulation has been main-
tained. Record the “Megger” readings. Immedi-
ately investigate any significant drop in insulation
resistance.
3. Check all electrical connectors to be sure that they
are tight.
4. Check that all mechanical fasteners are properly
tightened.
Lubrication and Bearings
Bearing grease will lose its lubrication 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 recom-
mendations are used in your maintenance program.
The recommended lubrication interval for 1800-RPM
motor, up to and including NEMA frame 215T is every
12000 hours of operation. It is important to remember
that this recommendation is base of average use. Refer
to
Table 2 on page 23
for additional information.
Types of Grease
A high-grade ball or roller bearing grease should be
used. See
Table 3 on page 23
for Recommended
Greases.
Chevron SRI (Factory Installed) - Polyurea Base
Lubrication Procedure
Be sure that the grease you are adding to the motor is
compatible with the grease already in the motor. Con-
sult your factory representative if a grease other than
the recommended type is to be used.
To avoid damage to motor bearings, grease
must be kept free of dirt.
With Grease Outlet Plug
1.
Clean grease fitting.
2. Remove grease outlet plug.
3. If motor is stopped, add the recommended amount
of grease. If motor is to be greased while running,
a slightly greater quantity of grease will have to
be added. Add grease slowly until new grease ap
pears at shaft whole in the end plate or purge out-
let plug.
4. Re-install grease outlet plug.
Without Grease Outlet Plug
1. Disassembly motor.
2. Add recommended amount of grease to bearing
and bearing cavity. (Bearing should be about 1/3
full of grease and outboard bearing cavity should
be about ½ full of grease.)
3. Assemble motor.
To re-lubricate the motor, consult the maintenance tag
provided on the motor.
Refer to
Table 1 on page 22
for minimum torque of
motor mounting and bearing bolts.
ENVIRO-TEC
24
FORM ET102.19-NOM1 (0521)
SECTION 4 - PERIODIC MAINTENANCE AND SERVICE
