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Fabrication Machining Works, Tube Cleaning Equipment, Grinding Machine Sellers, Polishing Machinery Manufacturing
Renowned Engineers Private Limited
Pozhal, Chennai - 600 066.
Phone : 044 26591002/3/4/5
Telefax : 044 26590260
[email protected]

Symptoms and possible Causes
Possible remedy
I. Motor fails to start :
a) Power not connected
a) Connect power to motor.
b) Faulty (open) fuses
b) Test/Replace Fuses.
c) Low voltage
c) Check motor name plate values with power supply. Also check voltage at Motor terminals with motor under load. Make sure wire size is adequate.
d) Loose terminal lead connection
d) Tighten connection.
Check the rotary switch terminals & strator contacts.
e) Overload control tripped
d) Wait for overload relay to cool. Try starting again. If the motor still does not start, check all the causes as outlined in the following.
f) Jammed or faulty shaft or Tool holder, Jamming the motor
f) Disconnect the shaft and then start the motor. If the motor starts satisfactorily, check the shaft and tool holder.
g) Open circuit in stator winding or Short circuit in stator winding or winding grounded.
g) Check for open circuit or for shorted coil and test for grounded winding.
h) Bearing stiff and damaged.
h) Free bearings or replace.
i) Grease too stiff
i) Use special lubricant for special conditions.
j) Over load
j) Reduce load, check fan wheel and clean.
k) Jamming of shoulder washer or cup washer
k) Check for the wear in the parts and the mating parts and replace if necessary.
l) Jamming due to misalignment in assembly
l) Check for the proper alignment of fan-cover, gearhousing and front cover. Replace wornout parts.
m) Jamming of gears
m) Check for the damaged, wornout gears and traping of foreign materials. Remove and replace accordingly.
II. Motor Noisy :
a) Motor running single phase
a) Stop motor, then try to start (it will not start in single phase). Check for open in one of the lines or circuits.
b) Vibration
b) Shaft assembly may be unbalanced. Remove the shaft assembly.
c) Air Gap not uniform
c) Centre the rotor and if necessary replace bearings.
d) Noisy Ball bearings
d) Check, and replace bearings, if the noise is persistent and excessive.
e) Rotor rubbing on rotor
e) Centre the rotor and replace bearings if necessary.
f) Object caught between fan and End shield or has damaged fan.
f) Dismantle motor and clean or replace the damaged parts.
g) Shoulder washer/Cup Washer/lock washer working loose.
g) Replace the worn out parts and fit them firmly.
h) Wornout or damaged gears or gearsshaft.
h) Replace the damaged / wornout gear or shaft.

III. Motor running temperature high :
a) Over load
a) Measure motor loading with ammeter, Reduce load.
b) Voltage imbalance in phases (fuse blown, faulty control)
b) Check for voltage imbalance or single Phasing. Check for open in one of the lines or circuits.
c) Restricted ventilation
c) Clean air passages and windings.
d) Incorrect voltage and frequency
d) Check motor name plate value with power supply.
e) Motor stalled dur to
1) Faulty shaft
2) Faulty bearings
3) Other wornout parts like rotor shafts or washers
e) Check and replace the faulty components.
f) Stator winding shorted or grounded or rubbing on rotor.
f) Test windings for short circuit or grounding effect.
IV. Bearing hot :
a) End shields loose
a) Make sure end shields fit squarely and are properly tightened.
b) Bent Shaft
b) Straighten the shaft or replace.
c) Excessive grease
c) Remove excess grease.
d) Wrong grade of grease
d) Remove and replace with proper grease.
e) Insufficient grease
e) Regrease bearings.
f) Foreign material in grease
f) Flush bearings & relubricate. Make sure that grease supply is clean.
g) Bearing misaligned
g) Align motor and check bearing housing. See that the bearing recess are exactly 90° with shaft.
h) Bearings damaged
h) Replace bearings.
V. General Precautions :
a) Ensure that the supply connections and direction of rotation of the motor are correct.
b) Always connect the motor through a starter as per our recommendations.
c) Do not change the speed in multispeed geared motors while the motor is running. Change the speed only after stopping the motor .


» Trouble Shooting Chart for motors
» Trouble Shooting Chart for flexible shafts
» Trouble Shooting Chart for Toolholders
» Recommended Greases for Sunner India Flexible Grinding Machines
» Selection of Direct on line Starters For Sunner - India Motors
» Selection and Application of Sunner - India Flexible Shaft Machines, Shafts, and Toolholders
» View Product Images
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