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ELECTRIC MOTOR REPAIR - continued - TM-5-4120-347-140122
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REFRIGERATION SYSTEM REPAIRS GENERAL - TM-5-4120-347-140124
TM5-4120-347-14
(1) Place a flat washer on each through bolt and insert through bolts through holes in both end-bells.
Place flat washers and lock nuts on through bolts, and tighten finger-tight.
(m) Tap around both end-bells with a plastic or rawhide mallet while tightening nuts on through bolts.
Tighten in 1-2 turn increments in alternating sequence until all the nuts are equally tightened. Check for
freedom of rotation by turning the motor shaft by hand. There should be no drag or binding.
(n) Check end-play of shaft. End play should be 0.002-0.005 inch (0.051-0.127 mm). If end-play is not
within limits, disassemble motor and add or remove shims to adjust.
(5) To replace the bearings on Welco Industries Inc. Motors:
(a) Match-mark the frame and the front and rear brackets.
(b) Remove four screws from each bracket.
(c) Carefully separate the brackets from the frame. Use a brass or plastic bar and hammer and tap the
brackets away from the stator. Tap opposite sides, top and bottom in a ternating sequence to break the
brackets loose.
Remove the brackets carefully to avoid damaging wires. Wires may be left in place if care is taken to
avoid damaging them.
(d) Unscrew the loop clamp from the side of the frame.
(e) Remove the brackets.
(f) Remove load spring, washers, and bearings. Retain the load springs and washers for use at
reassembly if they are not damaged.
(g) Examine rotor, stator and shafts for nicks, gouges, deformations and evidence of overheating.
(h) Dress high metal defects in shafts with a fine file or stone. If damage exceeds repairable limits,
replace the motor.
(i) Coat the shaft surfaces of the rotor with oil (MIL-L-2104, Grade 20) and slide the bearings on the shaft
ends.
(j) Coat the load spring and washers with oil (MIL-L-2104. Grade 20) and slide them on the Iong shaft end.
(k) Coat the bearing cavity of each bracket with oil, and slide carefully into position over shaft so that OD
of bearing enters ID of bearing cavity in bracket. Work brackets into place keeping the match-marks at time of
disassembly in alignment.
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