SANY LATIN AMERICA
4-147
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
5. Refrigerant charging operation
●
When evacuation is
fi
nished, add refrigerant into the cooling system as per the following in-
struction:
Charge at the hi-pressure side
1. Remove the green hose of the manifold
pressure gauge from the vacuum pump
and connect it to the
fl
uorine cylinder.
2. Loosen the cylinder valve and press the
vent valve on the gauge. Use the pressure
of the refrigerant to release the air in the
hose.
NOTE: Release the vent valve when you
hear a hissing sound.
ZX215-1002159
Lo
Hi
R134a
Loosen
this nut
OFF OFF
Vent valve
Blue
Red
Green
To compressor
Fluorine cylinder
Open
Valve
ZX215-1002160
R134a
D
S
Lo
Hi
Lo
Hi
Open Hi-press. valve
Lo-press.
valve (OFF)
Fluorine cylinder
valve (ON)
A cylinder
(about 600g)
Valve
g
Do not operate compressor
g
Do not open Lo-pressure valve
ON
OFF
OFF OFF
3. Open the hi-pressure valve of the manifold
pressure gauge and the cylinder valve with
the engine stopped. Fill about 600g of re-
frigerant.
4. Close the hi-pressure valve of the pressure
gauge and shut the cylinder valve.
CAUTION
●
Do not press the valve with naked hand
to avoid frostbite.
Evacuation starts
Evacuation ends
Air-proofness check
Add refrigerant kgf/cm
2
Air leak check
Add refrigerant
Air leak check
Performance testing
Wait 5 min
.
More than 15 min.
Pres. gauge
normal
75cm-Hg or more
Tighten pipe joint
Pres. gauge
abnormal
Check leak point
(1) Compressor stopped, charge at hi-press end
(2)Compressor running, add at lo-press end
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