SANY LATIN AMERICA
4-31
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
Structure
●
Cylinder block (7) is supported to shaft (1)
by spline (17).
●
Shaft (1) is supported by front and rear
bearings (18).
●
Tip of plunger (6) is shaped as a concave
ball and slipper (5) is caulked to it to form
one unit.
●
Plunger (6) and slipper (5) constitute the
spherical bearing.
●
Swash plate (4) has flat surface (A), and
slipper (5) is always pressed against this
surface while sliding in a circular move-
ment.
●
Swash plate (4) conducts high pressure oil
to cylinder surface (B), and forms a static
pressure bearing when it slides.
●
Plunger (6) carries out relative movement
in the axial direction inside each cylinder
chamber of cylinder block (7).
●
Cylinder block (7) seals the pressurized oil
to thrust plate (8) and carries out relative
rotation.
●
This surface is designed so that the oil
pressure balance is maintained at a suit-
able level.
●
The oil inside the respective cylinder cham-
bers of cylinder block (7) is sucked in and
discharged through thrust plate (8).
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