MacDon 9250 Operator's Manual page 120

SYMPTOM
Air conditioning not
cooling. (continued)
Air conditioning not
producing sufficient
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.)
* See your Windrower dealer
Form # 46584
TROUBLE SHOOTING
PROBLEM
Loose or broken drive
belt.
Compressor partially or
completely seized.
Dirty filters.
Broken or disconnected
electrical wire.
Broken or disconnected
ground wire.
Expansion valve stuck
in open or closed
position.
Broken refrigerant line.
Leak in system.
Compressor shaft seal
leaking.
Clogged screen in
receiver-drier; plugged
hose or coil.
Compressor clutch
slipping.
Clogged air filter.
Heater circuit is open.
Too little air circulation
over condenser coil; fins
clogged with dirt or
insects.
Evaporator fins clogged.
Too little refrigerant in
system.
118
SOLUTION
Replace drive belt and/
or tighten to specs.
Remove compressor for
service or replacement.
Clean fresh air and re-
circulation filters.
Check all terminals for
loose connections;
check wiring for hidden
breaks.
Check ground wire to
see if loose, broken, or
disconnected.
Replace expansion
valve.
Examine all lines for
evidence of breakage
by external stress or
rubbing wear.
Leak-test system; repair
leaks as necessary.
Replace compressor
shaft seal.
Repair as necessary.
Replace receiver-drier;
evacuate and charge.
Remove clutch
assembly for service or
replacement.
Remove air filter and
clean or replace as
necessary.
Close heater valves
(1 in cab, 1 at engine).
Clean condenser.
Clean evaporator fins
(under seat)
Recharge system until
gauge readings stabilize
to specifications.
Issue 11/06 Web Rev_01
REF.
66
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110, 111
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110
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111
112