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3 - 4
Parking Brake
During Travel
During travel, pressurised oil is fed to chamber
a
of the
parking brake from the brake valve (see
Brake Valve
,
During Travel
-
Brake Released
). When the oil pressure
exceeds the force of spring
113
, piston
112
moves to the left
causing plate
116
and friction plate
115
to separate. This
releases the braking force from cylinder block
104
, which is
free to rotate.
Travel Stopped
When travel is de-selected, pressurised oil is no longer fed
to chamber
a
, allowing piston
112
to move to the right under
the force of spring
113
. Plate
116
and friction plate
115
are
thereby clamped together to prevent cylinder block
104
from
rotating. A smooth brake operation is initiated.
Section F
Transmission
9803/6020
Section F
3 - 4
Issue 1
Operation
291160
291170
Summary of Contents for JS70
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