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Troubleshooting
Safety, Operation and Maintenance Manual - Aug 2012
6-40
SY115C9/135C/155H Crawler Hydraulic Excavator
Failure
Causes
Remedy
Low pressure gauge reads
lower
.
Both high and
low pressure
gauge read-
ings lower
the standard
value.
●
Refrigerant insuf
fi
cient
●
Refill refrigerant to the specified
level.
Low pressure
gauge could
read negative.
●
Low pressure hose blocked; expansion
valve blocked by ice or contaminants.
●
Repair the system. Replace reser-
voir in case of ice blockage.
Evaporator
frozen
●
Thermostat failure
●
Replace thermostat.
Expansion valve inlet
felt cool and frosted.
●
Expansion valve blocked.
●
Clean/replace expansion valve.
Expansion valve outlet
is not felt cool. Low
pressure could be
negative.
●
Expansion valve thermo-tube or bulb
leaks.
●
Replace expansion valve.
High pressure gauge reads higher
.
Both high/
low pressure
gauges read
higher than
standard
value.
●
Air trapped in circulation system.
●
Excessive refrigerant re
fi
lled.
●
Empty the system and vacuate to
re
fi
ll refrigerant.
●
Drain refrigerant to the specified
level.
Bad condens-
ing effect of
condenser.
●
Condenser blocked by dust and debris
●
Condenser fan damaged
●
Clean the condenser.
●
Check/replace condenser fan.
High
pressure
gauge
reads
lower.
Both high and
low pressure
gauges read
lower.
Low pres-
sure could be
negative.
Condenser
and high
pressure tube
hot
●
Refrigerant insuf
fi
cient
●
Low pressure line blocked/damaged
●
Compressor internal failure
●
Re
fi
ll refrigerant as required.
●
Clean/replace faulty component.
●
Replace compressor.
Bad refrigerating effect
due active heater
●
Hot water valve damaged and left open
●
Replace hot water valve.
Table 6-6
Содержание SY115C9
Страница 109: ...System Functions Safety Operation and Maintenance Manual Aug 2012 3 4 SY115C9 135C 155H Crawler Hydraulic Excavator ...
Страница 193: ...Operation Safety Operation and Maintenance Manual Sep 2012 4 4 SY115C9 135C 155H Crawler Hydraulic Excavator ...
Страница 263: ...Maintenance Safety Operation and Maintenance Manual Aug 2012 5 4 SY115C9 135C 155H Crawler Hydraulic Excavator ...
Страница 403: ...Specifications SY115C9 135C 155H Crawler Hydraulic Excavator 7 2 Safety Operation and Maintenance Manual Aug 2012 ...