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Page Title:
FAN DOES NOT OPERATE AT HIGH SPEED. (Cont) |
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 TM 9-2320-364-34-1
6. FAN DOES NOT OPERATE AT HIGH SPEED (CONT).
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Voltage test.
Unit Troubleshooting
on Page 2-229
STE/ICE-R #89.
tasks completed.
Fan operates at low speed.
EPAC controller OK.
REASON FOR QUESTION
Are 22 to 28 vdc measured on
Wire 1733 OK.
High speed fan lockout solenoid
If 22 to 28 vdc are present, wire
wire 1734 at LHS supply
valve OK.
1734 is shorted and fan will not
solenoid connector with
High speed fan lockout
operate at high speed.
hydraulic selector switch off?
differential pressure
sensing valve OK.
Low speed fan differential
pressure sensing valve OK.
POSSIBLE PROBLEMS
Go to Step 4
Wire 1734 faulty.
NO
of this Fault.
LHS supply solenoid valve
faulty.
LHS differential pressure
sensing valve faulty.
YES
Repair wire (see
schematic Fig 2-3) or
replace chassis wire
harness (Para 6-29).
Verify repair, go to
Step 10 of this Fault.
2-228
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