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Hydraulic Suspension LOCKOUT WILL NOT ENGAGE (HMMH). cont'd -680640350
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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 -680640352
TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 9. While holding control switch (5) completely out, check for +24 VDC between
wire 714 (9) and ground at D+ relay (7).
If +24 VDC is not present, repair wiring 714 between control
switch and D+ relay.
If +24 VDC is present, go to step 10.
Step 10. While holding control switch (5) completely out, check for +24 VDC
between wire 72 (15) and ground at D+ relay (7).
If +24 VDC is present, go to step 12.
If +24 VDC is not present, go to step 11.
Step 11. Check wire 03 (14) at D+ relay (7) for continuity to ground.
If open to ground, repair wiring 03 between D+ relay and
ground at NATO slave receptacle.
If short to ground, replace D+ relay.
Step 12. Check for +24 VDC between wire 72 (15) and ground at solenoid relay (13).
If +24 VDC is not present, repair wiring 72 between solenoid
relay and D+ relay.
If +24 VDC is present, go to step 13.
Step 13. Check for +24 VDC between wire 721 (16) and ground at solenoid relay
(13).
If +24 VDC is not present, repair wiring 721 at solenoid relay.
If +24 VDC is present, go to step 14.
Step 14. Check for +24 VDC between wire 722 (17) and ground at indicator light
(18).
If +24 VDC is not present, repair wiring 722 between solenoid
relay and indicator light.
If +24 VDC is present, go to step 15.
3-221

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