TM 55-1730-229-34
AG 320A0-MME-000
TO 35C2-3-473-2
TM 1730-34/1
Table 4-2. Direct/General SupportTroubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AGPU DOES NOT DRIVE WHEN SPEED/DIRECTION CONTROL ASSEMBLY AHNDGRIPS ROTATED
34.
IN EITHER DIRECTION (CONDITIONS PROPER FOR OPERATION (continued)
Position AGPU on level surface and chock front wheels. Raise rear of AGPU body with a jack
step 2.
until rear wheels are approximately 2-1/2 inches above the surface. Support the AGPU with jack
stands.
Operate AGPU in alternate (battery) propulsion mode (see TM 55-1730-229-12, paragraph
step 3.
2-10.b). While an assistant operates the speed/direction control assembly, measure the dc voltage
at terminals A1, A2, S1, and S2 of the traction motor (5, figure 10-3). Voltage should be +24 vdc
between Al and dc ground when the speed/direction control handgrips are rotated for forward
motion (FO-8) Voltage should be +24 vdc between A2 and ground when the handgrips are rotated
for reverse motiom. The voltage between S1 and ground and S2 and ground should vary from O
a
control assembly handgrips are rotated fully forward or reverse), do step 4.
If voltage-s at motor terminals and field terminals were all normal (or near normal)
b.
and DC AMPS reading was high (more than 300 amps after initial surge), go to step
5.
If the voltages at motor terminals (A1 and A2) and field terminals (Sl and S2) are all
c.
normal and DC AMPS meter shows no indicatkion when speed/diection control
assembly handgrips are rotated fully forward or reverse, do, Step 4.1.
If voltages at motor terminals (A1 and A2) were normal but field voltage was low,
d.
go to step 7.
If voltages at field terminals (S1 and S2) were normal but no voltage was present at
e.
motor terminals, go to step 14.
If all voltages were missing set power switches off and disconnect battery. Ckeck
f.
cable G11C2 between shunt R1 and relay K1, and cable G21A2N between motor
speed control and ground stud (figure FO-8).
Change 4
2-19