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 TM 9-4120-430-14
0037 00
3.
Check impeller (4) for damaged or bent vanes. Straighten or replace impeller.
4.
Inspect exterior case of motor for cracks, dents, oil, and evidence of overheating or any other abnormalities. Replace
defective motor.
5.
Turn motor shaft by hand and listen for clicking sounds that indicate bad bearings. Replace if bearings are bad.
6.
If the shaft cannot be rotated, the bearings may have seized. Replace motor.
7.
Test the thrust bearings by attempting to push and pull the motor shaft axially.
8.
If end play is excessive (i.e., can be felt on manual push-pull), the thrust bearings and shims are worn beyond limits
and motor should be replaced.
9.
Use a multimeter or continuity tester to check continuity between leads. See wiring diagram (WP 0038 00).
10. Check to be sure that continuity exists between leads. This means that open circuits do not exist. Replace motor if
either open or short circuits exist.
ASSEMBLY
1.
Install motor (3) on motor mounting plate (8) with four screws (33), flat washers (32), and nuts (31).
2.
Insert shaft extension (2) into impeller (4) and tighten two setscrews (31) on impeller (4) by using a socket head
screw key (Item 13, Table 2, WP 0067 00).
3.
Without using excessive force, insert impeller (4) into fan housing (11).
4.
Attach the inlet bell (30) to the fan housing (11) with four flat washers (29) and screws (28).
INSTALLATION
1.
Insert fan housing (11) back into position in unit housing.
CAUTION
Handle tubing at service valves, pressure relief valve, high and low pressure switches,
and linear-actuator with special care to avoid kinking or creating leaks at brazed joints.
2.
Bend tubing (27) from high and low pressure switches and service valves (19), pressure relief valve (23), and linear-
actuator (15) back into position with extreme care.
3.
Install clamps (26), flat washers (25), and screws (24) that secure the tubing (27) of the high and low pressure
switches to the fan housing (11).
4.
Install clamp (22), flat washer (21), and screw (20) that secure the pressure relief valve (23) to the fan housing (11).
5.
Install clamps (18) on service valves (19) and attach to fan housing (11) with flat washers (17) and screws (16).
6.
Attach the linear-actuator bracket (15) to the fan housing (11) with two flat washers (14), lockwashers (13), and
capscrews (12).
7.
Secure the fan housing (11) to the unit housing by installing six countersunk screws (9) on the bottom of unit
housing and one countersunk screw (10) on the side of unit housing.
0037 00-3
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