![background image](http://html1.mh-extra.com/html/jcb/js70/js70_service-manual_3631821289.webp)
3 - 1
Traction Motor
The motor is of the variable swash plate, axial piston type.
Pressurised oil is routed via rear flange
101
and timing plate
109
into cylinder block
104
.
The fixed timing plate directs oil to force piston
105
against
swash plate
103
, until it reaches the end of its power stroke,
causing the cylinder block to rotate 180°. When the piston
reaches the end of its power stroke, the cylinder is
disconnected from the oil supply line and instead is
connected to the return line. The next 180° of cylinder block
rotation causes the piston to complete its cycle by expelling
the oil from the cylinder back to tank.
Altogether there are nine pistons, operating sequentially as
described above to provide smooth continuous rotation of
the cylinder block, which is spline coupled to drive shaft
102
.
Section F
Transmission
9803/6020
Section F
3 - 1
Issue 1
Operation
291120
Summary of Contents for JS70
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