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Page Title:
Table 2-2. Direct/General Support Troubleshooting - continued |
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  TM
55-1730-229-34
320A0-MME-000
AG
TO
35C2-3-473-2
TM
1 730-34/1
Table 2-2.
Direct/General Support Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
34.
AGPU DOES NOT DRIVE WHEN SPEED/DIRECTION CONTROL ASSEMBLY HANDGRIPS ROTATED IN
EITHER DIRECTION (CONDITIONS PROPER FOR OPERATION) (continued)
If resistance checks are not normal, the potentiometer in
b.
the speed/direction control assembly or associated wiring is
defective. Repair wiring, or replace speed/direction control
assembly (TM 55-1730-229-12, paragraph 4-118).
Step 13.
Check wires between TB4 and terminals 1, 2, and 3 on motor speed
controller.
a. Replace any open wires.
b.
If wiring is good, replace motor speed controller (TM 55-
1730-229-12, paragraph 4-117).
Step 14.
Press deadman switch and rotate speed/direction control assembly
handgrip for forward motion. Measure voltages at TB4-6 (+24 vdc
normal) and TB4-7 (0 vdc normal).
a. If both voltages are normal, do step 14.
If either voltage is not normal, speed/direction control
b.
assembly components (reverse switch S2, forward switch S1, or
diode) or wires between switches and TB4 are defective.
Disconnect battery. Check wiring and repair if defective.
If wiring is good, check switches S1 and S2, and replace if
defective. If voltage is still not normal, replace speed/
direction control assembly (TM 55-1730-229-12, paragraph
4-118).
Step 15.
Press deadman switch and rotate speed/direction control assembly
handgrip for reverse motion. Measure voltages at TB4-6 (0 vdc
normal) and TB4-7 (+24 vdc normal).
a. If both voltages are normal, do step 16.
If either voltage is not normal, speed/direction control
b.
assembly components (reverse switch S2. forward switch S1,
or diode) or wires between switches and TB4 are defective.
Disconnect battery. Check wiring and repair if defective.
If wiring is good, check switches S1 and S2, and replace if
defective. If voltage is still not normal, replace speed/
direction control assembly (TM 55-1730-229-12, paragraph
4-118).
2-22
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