TM 55-1730-229-34
AG 320A0-MME-000
TO 35C2-3-473-2
TM 1730-34/1
Table 2-2.
Direct/General Support Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AGPU DOES NOT DRIVE WHEN SPEED/DIRECTION CONTROL ASSEMBLY HANDGRIPS ROTATED IN
34.
EITHER DIRECTION (CONDITIONS PROPER FOR OPERATION) (continued)
If voltage is present, do step 10.
a.
If voltage is not present, the spring return switch S3 in
b.
speed/direction control assembly is defective. Disconnect
battery and replace speed/direction control assembly
(TM 55-1730-229-12, paragraph 4-118).
Step 10.
With speed/direction control assembly handgrip rotated and deadman
switch pressed, check for +24 vdc at terminal 2 on TB4.
a. If voltage is present, do step 11.
If voltage is not present, deadman switch or associated
b.
wiring is defective. Disconnect battery and replace speed/
direction control assembly (TM 55-1730-229-12, paragraph
4-118).
Step 11.
Set power switches off and disconnect battery. Test DRIVE switch
1S3.
a. Replace switch if defective.
If switch tests good, check thermal switch in motor, wiring
b.
between DRIVE switch terminal 6 and terminal 2 on TB4, and
wiring between DRIVE switch terminal 5 and 28 VDC IN terminal
on motor speed controller. Replace any defective wiring. If
no defective wiring is found, the motor thermal switch is
open. If motor is hot, wait for motor to cool. If switch
does not close when motor cools down, replace motor (para-
graph 10-10).
Step 12.
Set power switches off and disconnect battery. Tag and disconnect
wires G7B20, G8B20 and G9B20 from terminals 3, 4, and 5 on TB4.
Measure resistance between TB4-3 and TB4-4 while rotating, speed/
direction control assembly handgrip. Measure resistance between
TB4-4 and TB4-5 while rotating handgrip in opposite direction. In
both cases, normal resistance is 0 to 10K. Reconnect wires (G7B20,
G8B20 and G9B20) to TB4 terminals 3, 4, and 5.
a. If resistance checks are normal, do step 13.
2-21
