HYDRAULIC SUSPENSION LOCKOUT WILL NOT ENGAGE (HMMH) (REG. NO. UC053E THRU UC053K) cont'd -680640377

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

Step 27. Disconnect connector AB (24) and check wire (36), on relay side of

connector, for continuity to ground.

If short to ground, repair wiring (36) between fast group relay

and connector AB.

If open to ground, reconnect connector AB and go to step 28.

Step 28. Disconnect cab floor separation point (25) and check wire (36), on cab side

of connector, for continuity to ground.

If short to ground, repair wiring (36) between connector AB and

cab floor separation point.

If open to ground, reconnect cab floor separation point and go

to step 29.

Step 29. Disconnect intermediate speed shift and indicator switch connector (37) and

check wire (36) for continuity to ground.

If open to ground, replace intermediate speed shift and

indicator switch (38) by removing switch and washer (39).

If short to ground, repair wiring (36) between cab floor

separation point and intermediate speed shift and indicator

switch connector.

Step 30. Check for +24 VDC between wire (40) and ground at motor relay (22).

If +24 VDC is present, go to step 37.

If +24 VDC is not present, go to step 31.

Step 31. Check for +24 VDC between wire (40) and ground at fuse box 3 (41).

If +24 VDC is present, repair wiring (40) between motor relay

and fuse box 3.

If +24 VDC is not present, go to step 32.

Step 32. Check for +24 VDC between wire (42) and wire (43) and ground at fuse

box 3 (41).

If +24 VDC is present, replace 16 amp fuse.

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