Quantcast HYDRAULIC SUSPENSION LOCKOUT WILL NOT ENGAGE (HMMH) (REG. NO. UC053E THRU UC053K) cont'd -680640368

 

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HYDRAULIC SUSPENSION LOCKOUT WILL NOT ENGAGE (HMMH) (REG. NO. UC053E THRU UC053K) cont'd -680640367
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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 -680640369
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 (6) and ground at D+ relay (7).
+24 VDC is not present, go to step 35.
If
+24 VDC is present, go to step 4.
If
Step 4. Check for +24 VDC between wire (8) and ground at control switch (5).
+24 VDC is not present, go to step 22.
If
+24 VDC is present, go to step 5.
If
Step 5. While holding control switch (5) completely out, check for +24 VDC between
wire (9) and ground at control switch.
If +24 VDC is not present, replace control switch (5) by
removing wire (8), wire (9), wire (10), knob (11), nut (12), and
control switch.
If +24 VDC is present, release control switch and go to step 6.
Step 6. Check for +24 VDC between wire (10) and ground at control switch (5).
If +24 VDC is not present, replace control switch (5) by
removing wire (8), wire (9), wire (10), knob (11), nut (12), and
control switch.
If +24 VDC is present, go to step 7.
Step 7. Check for +24 VDC between wire (10) and ground at solenoid relay (13).
If +24 VDC is not present, repair wiring (10) between control
switch and solenoid relay.
If +24 VDC is present, go to step 8.
Step 8. Check wire (14) at solenoid relay (13) for continuity to ground.
If open to ground, go to step 11.
If short to ground, go to step 9.
3-238

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