SANY LATIN AMERICA
4-155
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
●
Refrigerant not circulating
Symptom: Non-refrigeration (intermittent refrigeration)
Symptom
Cause
Analysis
Remedy
●
Vacuum at Lo-pres-
sure side; pressure
at Hi-pressure side
extremely low
●
Frosting or conden-
sation on the pipes
around the expan-
sion valve or receiv-
er/dehydrator
●
Moisture or contami-
nant in the refrigerant
hinders the
fl
ow of
refrigerant.
●
Air leak at the thermal
pipe of the expansion
valve hinders the
fl
ow
of refrigerant.
●
Refrigerant not
circulating
●
Check the expansion valve
and ERP.
●
Blow the contaminant in the
expansion valve or replace
the expansion valve if nec-
essary.
●
Replace the receiver
●
Release internal air and
add refrigerant. If air leaks
from thermal pipe, replace
expansion valve.
ZX215-1002171
0
0
01
02
03
04
05
05
0
0
35
MPa
MPa
{cmHg kgf/cm
2
}
{cmHg kgf/cm
2
}
5
3
30
25
25
20
10
1
15
2
15
35
-01
-01
-76
-76
-50
06
07
08
085
8.5
8
7
5
6
4
3
2
1
15
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