MOTOR ALTERNATING CURRENT (B2) (Continued)

TM 5-4120-359-14

(g) Carefully place the rotor and shaft with bearings back in the motor housing.

(h) Using screwdriver, secure the end caps to the motor with eight screws and washers. Before tightening

completely, spin shaft to see that it spins freely. If any rubbing is noted, adjust the end caps slightly to relieve rubbing.

Finish tightening the eight screws.

(i) 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.

(3) To replace bearings on Welco Industries, Inc. motors:

(a) Using screwdriver, remove four screws and washers and carefully remove the end bracket.

(b) Carefully pull the rotor with shaft assembly from the motor housing.

removed.

(d) Remove the washer bearing spacer(s) and load spring and pull the bearings from the shafts.

(e) Place the new bearings on the shafts.

(f) Place the load spring and washer bearing spacer(s) back on shaft in same position as removed.

(g) Carefully place the rotor with shaft with bearings back in the motor housing.

(h) Using screwdriver, secure the end bracket to the housing assembly with four screws and washers.

Before tightening completely, spin shaft to see that it spins freely. If any rubbing is noted, adjust the end cap slightly to

relieve rubbing. Finish tightening the four screws.

(i) 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.

e. Installation

(1) Slip the motor into place and position impeller and extension shaft loosely on motor shaft.

(2) Line up motor and bracket screw holes.

(3) Using socket and ratchet, fasten motor to bracket with four screws, lock washers, and flat washers.

(4) Aline extension shaft setscrews with flat surface on motor shaft.

(5) Position impeller for 1/8 inch clearance (measure with tape) from inside edge of fan inlet.

(6) Using allen wrench, tighten two setscrews to secure shaft extension and impeller on motor shaft.

(7) Spin impeller and check that it clears inlet all around.

(8) If impeller does not spin freely, increase clearance, step (4) slightly.

(9) Connect P11 connector plug to J11 motor connector.

Follow-on Procedures: 1. Install top condenser cover. (See paragraph 3-25.)

2. Connect power.

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