Cub Cadet 8454 Service Manual page 329

Causes
4. The pressure of inlet of the
compressor
4-1. The pressure of low pressure
is high.
1) Poor thermo switch
2) Poor gasket or valve of the
compressor
3) Poor contact of wound box
of extension valve
4) Txtension valve is too much
open
4-2. The pressure of low pressure
is low.
1) Lack of the amount of
refrigerant
2) The receiver drier is
clogged.
3) Extension valve is clogged.
4) Gas leakage of wound box
of extension valve
5) Clogging or distortion of
pipe
6) Poor thermo. switch
4-3. The pressure of high
pressure is high.
1) Poor cooling of the
compressor
2) Overcharging of refrigerant
3) Air mixing in the cycle
4-4. The pressure of high
pressure is low.
1) Lack of refrigerant
D569-W02 May-2003
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Checking Methods
Normal pressure
High pressure: 14 ~ 15 kg/cm
(199 ~ 213 psi)
Low pressure: 1.5 ~ 2.0 kg/cm
(21 ~ 28 psi)
Ambient temperature: 30 ~ 35 °C,
Engine : about 1,500 rpm
Magnetic clutch is off before the
extract air temperature falls down
enough.
When magnetic clutch is off, the
pressure of high/low pressure
gauge is balanced promptly.
Frost generation in the connection
section of compressor and the
temperature is colder than the
pipe of outlet of vaporizer.
DITTO. No change of pressure
regardless of attaching or detach-
ing the wound box from the pipe.
Refer to "the lack of the amount of
refrigerant".
The difference of temperature of
tank exit. Frost in the tank.
The inlet side of extension valve is
cold and frosty.
The outlet side of extension valve
is not cold and low pressure
gauge is vacuum.
The clogging of pipe means the
low pressure is low or negative
pressure.
Freezing of vaporizer.
Contamination/clogging of
compressor, poor revolution of
cooling fan, cutting of fuse, wire
cutting of harness and poor
contact.
Refer to "overcharging of
refrigerant".
Refer to "lack of refrigerant".
CABIN SYSTEM
Action
Replacement
2 G
2 G
Adjustment, Replacement
Replacement/repair of compres-
sor
Adhere the wound box to the low
pressure pipe.
Replacement
Supplement of refrigerant
Replacement of the receiver drier
Replacement of extension valve
Replacement of extension valve
Cleaning of pipe or replacement
Adjustment/ replacement
Cleaning, repair or replacement of
fan
Adjustment of refrigerant
Vacuum works, recharging of
refrigerant
Supplement of refrigerant
9-15