Cub Cadet 8454 Service Manual page 328

CHAPTER 9 8454
f. Abnormal noise from the blower motor
In case of the generation of abnormal noise from
the blower motor and the poor revolution, change
the blower motor with the new one.
In case of generation of the abnormal noise caused
by the foreign material in the blower or by the poor
tightening, pay attention to work.
B. EARLY FINDING OF TROUBLE
SHOOTING
a . Poor Air-Conditioning
1) Fan motor does not revolve.
Causes
1. Fuse cutting
2. Wiring cutting or poor
connection
3. Failure of fan motor
4. Wire cutting of resister
5. Failure of fan switch
2) Fan motor is normal but the capacity of wind is small.
Causes
1. Obstacles in the inlet of suction
of vaporizer
2. Air leakage
3. Poor thermo-switch
3) The extract airflow and revolution of compressor is normal but poor air-conditioning.
Causes
1. Excess/lack of refrigerant
2. Lack of refrigerant
3. Over supplement of refrigerant
9-14
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Checking Methods
Check the fuse of air-conditioner.
Check the earth of fan motor and
the missing of key boss.
When checking 2 leads coming
from the motor in the circuit tester,
the current does not transmit.
When checking whether or not the
resister transmits the current by
circuit tester, the current does not
transmit.
Check the revolution of fan by
operating the fan switch in order.
Checking Methods
Contamination of vaporizer
Check the assembly status of
cooling unit case.
Check whether the vaporizer is
frozen with a circuit tester.
Checking Methods
After 5 ~ 10 min. operation of air-
conditioner, touch the high/low
pressure pipe by hand. Observe
the flow of refrigerant of sight
glass and check the amount of
refrigerant.
Rarely the difference of tempera-
ture between high pressure side
and low pressure side. The flow of
bubble is seen in the sight glass
or the flow of foggy state is a little
seen.
The pressure of high-pressure
side is high and the bubble of
sight glass is not seen when we
try to cool the compressor with
water.
Action
Replacement
Repair the cutting section or
connect correctly.
Replacement
Replacement
Replacement
Action
Removal of obstacles, cleaning
Modification or adjustment
Replacement
Action
Repair the leaked part and
supplement by the proper amount.
Exhaust the refrigerant little by
little till you can see the bubble in
the sight glass.
D569-W02 May-2003