TM9-4120-400-14
5-8.
a. To replace connector (1):
(1) Loosen cable clamp (2).
(3) Remove old connector (1).
(4) See wiring diagram figure 4-4 and tags and solder leads to new connector(1). Remove tags.
(5) Secure cable clamp (2).
b. TO replace bearings:
(1) Match mark stator (3) and both end caps (4 and 5) to ease reassembly.
(2) Remove four thru bolts (6), lock washers (7), and square nuts (8) from front end cap (4) and rear end
cap (5).
(3) Carefully separate end caps (4 and 5) from stator (3). Tap opposite sides, top and bottom in
alternating sequence to break end caps loose.
(4) Press out or carefully drive bearings (9) out of end caps (4 and 5). Retain washers (10) and load spring
(11) from front end cap for use at reassembly, if they are not damaged.
(5) Examine rotor (12), stator (3), and shafts for nicks, gouges, deformations, and evidence of
overheating.
(6) Dress high metal defects in shafts with a fine file or stone. If damage exceeds repairable limits, replace
motor.
(7) Coat shaft surfaces of rotor (12) with oil and slide bearings (9) on shaft ends. They should seat against
shoulders at the inner ends of shaft.
(8) Coat washers (10) and load spring (11) with oil and slide them over end of front shaft with load spring
(11) installed first.
(9) Coat bearing cavity of each end cap (4 and 5) with oil. Slide end cap carefully into position over shaft
so that OD of bearing (9) enters ID of bearing cavity in end cap. Work end caps onto shaft until bore
fits over end of stator (3). Keep match marks made at time of disassembly in alignment.
(10) Place four thru bolts (6), Iock washers (7), and square nuts (8) thru motor assembly. Finger tighten.
(11) Tap around both end caps with a plastic or rawhide mallet while tightening thru bolts (6). Tighten in
alternating sequence until all thru bolts are equally tightened. Check motor for freedom of rotation by
turning motor shaft by hand. There should be no drag or binding.
(12) 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 washers to adjust.
2. Motor Assembly, Howell Electric Motor Division of SFM Corp., Single Phase Motor, Model 70N4-4886.
5-18