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Hydraulic Suspension LOCKOUT WILL NOT ENGAGE (HMMH).
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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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Hydraulic Suspension LOCKOUT WILL NOT ENGAGE (HMMH). cont'd -680640350
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 3. Check for +24 VDC between wire 286 (6) and ground at D+ relay (7).
If +24 VDC is not present, go to step 37.
If +24 VDC is present, go to step 4.
Step 4. Check for +24 VDC between wire 712 (8) and ground at control switch (5).
If +24 VDC is not present, go to step 21.
If +24 VDC is present, go to step 5.
Step 5. While holding control switch (5) completely out, check for +24 VDC between
wire 714 (9) and ground at control switch.
If +24 VDC is not present, replace control switch (5) by
removing wire 712 (8), wire 714 (9), wire 713 (10), knob (11),
nut (12), and control switch.
If +24 VDC is present, release control switch and go to step 6.
3-219

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