SANY LATIN AMERICA
4-145
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
Step 2: Evacuation
1) Open the high-pressure valve (HI) and low-
pressure valve (LO) on the manifold pres-
sure gauge.
2) Turn on the vacuum pump and evacuate
for about 15 minutes.
3) When negative pressure reading on the
gauge (degree of vacuum) reaches above
750 mmHg, turn off the vacuum pump and
close the Hi-pressure valve and the Lo-
pressure valve on the gauge.
ZX215-1002156
Lo
Hi
Tighten pipe joint
Lo-press. gauge
returns to 0
Wait 5 min. or more
Lo-press. gauge
Pointer returns
to 0
Valve
OFF OFF
Step 3: Air - proof check
1) Keep the Hi- and Lo-pressure valve of the
manifold pressure gauge under closed
state for more than 5 minutes, and make
sure the pointer on the gauge does not re-
turn to zero.
2) If the pointer returns to near zero, a leak-
age is available somewhere. Check and
adjust the pipe joint. Tighten the joint and
conduct another evacuating operation until
no leakage is detected.
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