TM 9-4110-254-14
4-41. AC MOTOR B2 TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Materials/Parts:
Equipment Conditions:
Lock Washers (4)
disconnected.
Self Locking Nuts (2)
Left side door open.
Front bottom door open.
Cotter pins (2)
Marker tags (4)
General Safety Instructions'
WARNING
High voltage and exposed rotating parts are
used in the refrigeration unit. Personal injury
can result if power is connected
(1)
Remove four bolts (1) and terminal cover (2).
(2)
Tag and disconnect wire leads (3)
(3)
Check that AC motor (4) winding leads are connected as follows; T4 to T14, T5 to T15, T6 to T16, T1 to
T7,T2 to T8, and T3 to T9. If the leads are not connected properly, connect them now.
(4)
Using multimeter set to measure continuity, check AC motor (4) winding continuity between leads T1/T7 to
T2/T8, T1/T7 to T3/T9, and T3/T9 to T2/T8. Continuity should be indicated. If continuity was not
indicated, replace motor.
(5)
T1 /T7, T2/T8, and T3/T9 to motor frame ground No continuity should be indicated. If continuity was
indicated, replace motor.
(6)
If no failure was indicated, connect wire leads (2) using tags and wiring diagram (fig 1-4). Remove tags.
(7)
Install terminal cover (2) and four bolts (1).
b. Removal.
(1)
Remove four bolts (1) and terminal cover (2).
(2)
Tag and disconnect wire leads (3).
(3)
Remove conduit locknut (5), connector (6), and wire leads (3).
4-89