Komatsu Galeo PC800-8 Shop Manual page 194

SEN00384-02
1-1 Motor
• There are 9 pistons (7) assembled in cylinder
block (6). The end face of the cylinder block has
a spherical surface and is in contact with valve
plate (5), which has two half-moon shaped ports
(divider valve for high/low speed selector).
• The fixed surface (contact surface with the motor
case) forming the non-sliding surface of rocker
cam (14) has two faces. The high/low speed vol-
ume selection for this motor is carried out by fix-
ing each face to provide large capacity (low
speed) or small capacity (high speed).
The angling operation of rocker cam (14) is car-
ried out by actuating control piston (10) with the
self-pressure through the speed selector valve
when the motor is being driven, and this angles
the rocker cam.
There are two control pistons each for the high/
low pressure divider ports of valve plate (5), and
these provide propulsion force to the rocker
cam.
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10 Structure, function and maintenance standard
PC800, 850-8