Trouble Shooting; Cab Air System - MacDon 9250 Operator's Manual

SYMPTOM

Cab Air System

Blower fan will not run.
Blower fan operating but
no air coming into cab.
Heater not heating.
Odour from air louvers.
Air conditioning not
cooling.
* See your Windrower Dealer.
Form # 46584

TROUBLE SHOOTING

PROBLEM
See page 112 for possible causes of abnormal high side / low side pressure.
Burned out motor.
Burned out switch.
Motor shaft tight or
bearings worn.
Faulty wiring - loose or
broken.
Blower rotors in contact
with housing.
Dirty fresh air filter.
Evaporator clogged.
Air flow passage
blocked.
Heater shut-off valve at
engine closed.
Defective thermostat in
engine water outlet
manifold.
Heater temperature
control defective.
No thermostat in engine
water outlet manifold.
Plugged drainage hose.
Dirty filters.
Low refrigerant level.
Switch contacts in
thermostat burned
excessively, or sensing
element defective.
Clutch coil or relay
burned out or
disconnected.
Condenser fins plugged.
Blower motor discon-
nected or burned out.
SOLUTION
Replace motor.
Replace switch.
Repair motor.
Repair or replace wiring.
Replace rotors and/or
housing.
Clean filter.
Clean evaporator.
Remove blockage.
Open valve.
Replace thermostat.
Replace control.
Install thermostat.
Blow out hose with
compressed air.
Clean filters.
Add refrigerant
Replace thermostat.
Check current flow to
clutch or relay. Replace
if inoperative.
Clean condenser.
Check current flow to
blower motor. Repair or
replace if inoperative.
117
REF.
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110
111
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21
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110, 111
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79
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Issue 11/06 Web Rev_01