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HYDRAULIC OIL COOLER FANS WILL NOT OPERATE.
Up
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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THROTTLE CONTROL SWITCH WILL NOT OPERATE (SEE).
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Disconnect connector A (1) and check for +24 VDC between wire 70 (2)
Step 1.
and ground.
If +24 VDC is not present, repair wiring 70 between
connector A and fuse box 1.
If +24 VDC is present, reconnect connector A and go to step 2.
Disconnect connector X (3) and check for +24 VDC between wire 70 (2)
Step 2.
and ground.
If +24 VDC is not present, repair wiring 70 between
connector X and connector A.
If +24 VDC is present, reconnect connector X and go to step 3.
Check for +24 VDC between wire 70 (2) and ground at hydraulic oil cooler
Step 3.
terminal board (4).
If +24 VDC is not present, repair wiring 70 between
connector X and hydraulic oil cooler.
If +24 VDC is present, go to step 4.
Check for continuity of black and red wires (5) between hydraulic oil cooler
Step 4.
terminal board (4) and hydraulic oil cooler thermal switches (6).
if there is no continuity, repair black or red wire between
hydraulic oil cooler thermal switches and hydraulic oil cooler
terminal board.
If there is continuity, go to step 5.
Check for continuity of black and red wires (7) between hydraulic oil cooler
Step 5.
terminal board (4) and fan motors (8).
If there is no continuity, repair black or red wire between fan
motors and hydraulic oil cooler terminal board.
If there is continuity, go to step 6.
Remove two screws (9) and two lock washers (10).
Step 6.
Disconnect red wires (11 and 12) and short them to wire 70 (2).
Step 7.
If fans do not operate, replace hydraulic oil cooler (page 4-722).
If fans operate, replace both hydraulic oil cooler thermal
switches (page 4-1 47).
3-255

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