SANY LATIN AMERICA
4-140
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.7.11 Pressure switch
1) O-ring
2) Mobile contact point
3) Hood
4) Plug
and
fi
xed contact
5) Spring
6) Chamber
7) Diaphragm
Function
●
The pressure switch is installed between
the receiver tank and the expansion
valve (hi-pressure pipe). It is a combina-
tion switch (Hi-Lo pressure combination
switch).
●
When pressure is excessively high, the
compressor stops.
●
When pressure and temperature is very
low, the compressor stops.
Operating features
ZX215-1002150
1
2
3
4
5
6
7
Pressure
DIFF
OFF
ON
DIFF
0.59±0.2 MPa
0.196±0.02 MPa
0.196~0.250 MPa
2.94~3.19 MPa
ON
OFF
1.23±0.1 MPa
1.52±0.08 MPa
HI pressure
operating value
LO pressure
operating value
MID pressure
operating value
Feature
Above 0.02 MPa
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