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Page Title:
FAN DOES NOT OPERATE AT HIGH SPEED. |
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 TM 9-2320-364-34-1
2-13. HYDRAULIC SYSTEM TROUBLESHOOTING (CONT).
6. FAN DOES NOT OPERATE AT HIGH SPEED.
INITIAL SETUP
Materials/Parts
Tools and Special Tools
Parts Kit, Seal (Item 411, Appendix E)
Tool Kit, General Mechanic's
Parts Kit, Seal (Item 412, Appendix E)
(Item 240, Appendix F)
Analyzer Set, STE/ICE-R (Optional)
References
(Item 15, Appendix F)
TM 9-2320-364-10
Multimeter (Item 140, Appendix F)
TM 9-2320-364-20
Pan, Drain 4 gal (Item 144, Appendix F)
TM 9-4910-571-12&P
Materials/Parts
Oil, Hydraulic (Item 34, Appendix B)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Sealing Compound (Item 62, Appendix B)
Parking brake applied, (TM 9-2320-364-10)
Lockwashers (4) (Item 266, Appendix E)
Wheels chocked, (TM 9-2320-364-10)
Lockwashers (8) (Item 282, Appendix E)
Coolant temperature at 190F, (88C)
Packing, Preformed (Item 352, Appendix E)
Parts Kit, Seal (Item 410, Appendix E)
START
1.
KNOWN INFO
TEST OPTIONS
Unit Troubleshooting
Fan operation test.
Does fan operate at high
tasks completed.
speed with connector MC59
Fan operates at low speed.
REASON FOR QUESTION
disconnected from EPAC
controller?
POSSIBLE PROBLEMS
If EPAC controller is faulty,
valve will not open and high
EPAC controller faulty.
speed fan will not operate.
Wire 1734 faulty.
LHS supply solenoid valve
faulty.
LHS differential pressure
sensing valve faulty.
Wire 1733 faulty.
High speed fan lockout solenoid
valve faulty.
Go to Step 2 of this
NO
High speed fan lockout
Fault.
differential pressure
sensing valve faulty.
Low speed fan differential
pressure sensing valve faulty.
YES
Adjust or replace
EPAC controller
(Para 6-12).
Verify repair, go to
Step 10 of this Fault.
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