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THROTTLE CONTROL SWITCH WILL NOT OPERATE (HMMH). -680640392
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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TRANSMISSION WILL NOT OPERATE IN ANY FORWARD OR REVERSE GEAR.
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 1. Check for +24 VDC between wire 70M (1) and ground at auxiliary throttle
switch (2).
If +24 VDC is not present, repair wiring 70M between auxiliary
throttle switch and connector X.
If +24 VDC is present, go to step 2.
Step 2. With auxiliary throttle switch (2) in CRANE position, check for +24 VDC
between wire 73V (3) and ground at auxiliary throttle switch.
If +24 VDC is not present, replace auxiliary throttle switch
(page 4-156).
If +24 VDC is present, go to step 3.
Step 3. With auxiliary throttle switch (2) in CRANE position, check for +24 VDC
between wire 73V (3) and ground at tool switch (4).
If +24 VDC is not present, repair wiring 73V between auxiliary
throttle switch and tool switch.
If +24 VDC is present, go to step 4.
Step 4. With auxiliary throttle switch (2) in CRANE position, check for +24 VDC
between wire 73V (3) and ground at throttle control switch (5).
If +24 VDC is not present, repair wiring 73V between tool
switch and throttle control switch.
If +24 VDC is present, replace throttle control switch
(page 4-158).
3-263

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