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Hydraulic Suspension LOCKOUT WILL NOT ENGAGE (HMMH). cont'd -680640363
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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 -680640365
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 46. Check for +24 VDC between wire 4 (52) and ground at cab floor
separation point (25).
If +24 VDC is not present, repair wiring 4 between hydraulic
switch and cab floor separation point.
If +24 VDC is present, go to step 47.
Step 47. Check for +24 VDC between wire 4 (52) and ground at connector AA (46).
If +24 VDC is not present, repair wiring 4 between cab floor
separation point and connector AA.
If +24 VDC is present, go to step 48.
Step 48. Check for +24 VDC between wire 4 (52) and ground at motor relay (43).
If +24 VDC is not present, repair wiring 4 between
connector AA and motor relay.
If +24 VDC is present, go to step 49.
Step 49. Check wire 01 (53) at motor relay (43) for continuity to ground.
If short to ground, replace motor relay.
If open to ground, repair wiring 01 between motor relay and
NATO slave receptacle.
3-234

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