TM 9-4110-258-13
4.34 AC MOTOR B2 TESTING AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Materials/Parts:
Equipment Conditions:
Lock Washers (4)
Refrigeration unit shut down (para 2.7) and power
7, Appendix G
disconnected.
Self Locking Nuts (2)
Left side door open.
17, Appendix G
Front door open.
Marker Tags (7)
V-belt removed from pulley only (para 4.31).
7, Appendix E
7,Cotter Pin E2
General Safety Instructions:
13, Appendix G
WARNING
High voltage and exposed rotating parts are
used in the refrigeration unit. Personal injury
can result if power is connected.
a. Testing. (See Figure 1-4.)
(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) Using multimeter set to measure continuity, check AC motor (4) winding continuity between each lead 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 connector locknut (5), connector (6), and wire leads (3).
(4) Remove four bolts (7), lock washers (8), and AC motor (4) through front door. Discard lock washers.
4-74
