Quantcast HYDRAULIC SUSPENSION LOCKOUT WILL NOT ENGAGE (HMMH) (REG. NO. UC053E THRU UC053K) cont'd -680640375

 

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HYDRAULIC SUSPENSION LOCKOUT WILL NOT ENGAGE (HMMH) (REG. NO. UC053E THRU UC053K) cont'd -680640374
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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) (REG. NO. UC053E THRU UC053K) cont'd -680640376
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 20. Check for +24 VDC between wire (23) and ground at pin 1 of solenoid
connector (30).
If +24 VDC is not present, repair wiring (23) between cab floor
separation point and solenoid "connector.
If +24 VDC is present, go to step 21.
S t e p 21. Check wire (31) at solenoid connector (30) for continuity to ground.
If short to ground, replace hydraulic suspension lockout pump
(page 4-511).
If open to around, repair wiring (31) between solenoid and
ground at NATO slave receptacle.
Step 22. Check for +24 VDC between wire (8) and ground at fast group relay (32).
If +24 VDC is present, repair wiring (8) between fast group
relay and control switch.
If +24 VDC is not present, go to step 23.
Step 23. Check for +24 VDC between wire (33) and ground at fast group relay (32).
If +24 VDC is present, go to step 25.
If +24 VDC is not present, go to step 24.
Step 24. Check for +24 VDC between wire (33) and ground at fuse box 1 (34).
If +24 VDC is not present, replace fuse.
If +24 VDC is present, repair wiring (33) between fast group
relay and fuse box 1.
Step 25. Check for +24 VDC between wire (35) and ground at fast group relay (32).
If +24 VDC is not present, repair wiring (35) at fast group relay.
If +24 VDC is present, go to step 26.
Step 26. Check wire (36) at fast group relay (32) for continuity to ground.
If short to ground, go to step 27.
If open to ground, replace relay.
3-245

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