User Manual
Maintenance & Troubleshooting 3-1MN408
Section 3
Maintenance & Troubleshooting
WARNING: UL and EX Listed motors must only be serviced by UL or EX Approved Authorized Baldor Service
Centers if these motors are to be returned to a hazardous and/or explosive atmosphere.
General Inspection
Inspect the motor at regular intervals, approximately every 500 hours of operation or every 3 months,
whichever occurs rst. Keep the motor clean and the ventilation openings clear. The following steps should be
performed at each inspection:
WARNING: Do not touch electrical connections before you first ensure that power has been disconnected.
Electrical shock can cause serious or fatal injury. Only qualified personnel should attempt the
installation, operation and maintenance of this equipment.
1. Check that the motor is clean. Check that the interior and exterior of the motor is free of dirt, oil, grease,
water, etc. Oily vapor, paper pulp, textile lint, etc. can accumulate and block motor ventilation. If the motor
is not properly ventilated, overheating can occur and cause early motor failure.
2. Perform a dielectric with stand test periodically to ensure that the integrity of the winding insulation has
been maintained. Record the readings. Immediately investigate any signicant decrease in insulation
resistance.
3. Check all electrical connectors 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 used in your maintenance program.
Type of Grease A high grade ball or roller bearing grease should be used. Baldor motors are pregreased, normally with
Polyrex EM (Exxon Mobil) or as stated on the nameplate.
Do not mix greases unless compatibility has been checked and veried.
Ball Bearing Motors
Operating Temperature −25 ºC (−15 ºF) to 50 ºC (120 ºF)
EXXON POLYREX EM (Standard on Baldor motors)
EXXON UNIREX N2
EXXON BEACON 325
CHEVRON OIL SRI NO. 2 ( Compatible with Polyrex EM )
CHEVRON OIL BLACK PEARL
TEXACO, INC. PREMIUM RB
TEXACO, INC. POLYSTAR
AMOCO RYKON # 2
PENNZOIL PENNZLUBE EM−2
DARMEX DARMEX 707
DARMEX DARMEX 711
PETRO−CANADA PEERLESS LLG
SHELL OIL DOLIUM BRB
Minimum Starting Temperature −60 ºC (−76 ºF)
SHELL OIL CO. AEROSHELL 7 (Standard on Baldor motors)
MOBIL MOBIL 28
MOBIL MOBILITH SHC 100 (Low Temperature − Arctic Duty)
Roller Bearing Motors
Operating Temperature −25 ºC (−15 ºF) to 50 ºC (120 ºF)
TEXACO, INC. PREMIUM RB
MOBIL MOBILITH SHC 220 (Standard on Baldor motors)
CHEVRON OIL BLACK PEARL