SANY LATIN AMERICA
6-47
SY195/205/215/225C9 Crawler Hydraulic Excavator
Testing and Adjusting
Shop Manual - June 2013
2. Bleed air from hydraulic cylinder
1) Start the engine and keep the engine
running at low idle for 5 minutes.
2) Raise or lower the boom 4 or 5 times
with the engine running at low idle.
NOTE: Be careful not to apply relief
pressure. Stop the piston when the rod
is about 100 mm before stroke end.
3) Repeat step 2) with the engine running
at high idle.
4) While running the engine at low idle,
move the piston rod to the stroke end
and apply relief pressure.
5) Bleed air from arm cylinder and bucket
cylinder by performing step 2) through
step 4).
NOTE: When a new cylinder is in-
stalled for replacement, bleed the air
from the new cylinder before mounting
it to the work equipment. Especially the
boom cylinder, once mounted to the
work equipment, its piston rod is un-
able to reach its stroke end in lowering
operation. Therefore, the air must be
bled from the boom cylinder before it is
mounted to the work equipment.
3. Bleed air from swing motor
1) Start the engine and run the engine at
low idle.
2) Bleed air from the swing motor by turn-
ing the upper structure slowly.
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