
TROUBLESHOOTING
* See Your MacDon Dealer
** Refer to Windrower Technical Manual
Form 169552 / 169554 / 169555
191
Revision A
SYMPTOM
PROBLEM
SOLUTION
SECTION
Air Conditioning Not
Cooling. (Cont’d)
Leak in system.
Contact your Dealer.
*
Compressor shaft seal leaking.
Clogged screen in receiver-drier;
plugged hose or coil.
Air Conditioning
Producing Insufficient
Cooling.
(Sufficient Cooling Defined
As When Air Temperature
In Cab, Measured At
Louvered Vent, Can Be
Maintained At 25°F (14°C)
Below Ambient Air
Temperature.)
Refrigerant low.
Clogged expansion valve.
Clogged receiver-drier.
Excessive moisture in system.
Air in system.
Blower motor sluggish in operation.
Compressor clutch slipping.
Remove clutch assembly for
service or replacement.
**
Clogged air filters.
Remove air filters.
Clean or replace as necessary.
7.7.6.1 &
7.7.6.2
Heater circuit is open.
Close heater valves (1 in cab and
1 at engine).
5.10.1
5.10.3
Insufficient air circulation over condenser coil;
fins clogged with dirt or insects.
Clean condenser.
7.9.3
Evaporator fins clogged.
Clean evaporator fins
(under cab floor).
7.7.6.4
Thermostat defective or improperly adjusted. Replace thermostat.
**
Air Conditioning System
Too Noisy.
Defective winding or improper connection in
compressor clutch coil or relay.
Contact your Dealer.
*
Excessive charge in system.
Low charge in system.
Excessive moisture in system.
Noisy clutch.
Remove clutch for service or
replacement as required.
**
Noisy compressor.
Check mountings and repair.
Remove compressor for service
or replacement.
Compressor oil level low.
Add SP-15 PAG refrigerant oil.
Blower fan noisy due to excessive wear.
Remove blower motor for service
or replacement as necessary.
Loose or excessively worn drive belt.
Tighten or replace as required.
7.8.10.2
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