jcb JS300 Service Manual page 990

Parking Brake
The parking brake consists of alternate friction and counter
plates (A and B), a piston C and an activating spring D.
Pressurised oil is guided to the parking brake release
cylinder E via the counter balance spool. The force on the
brake piston overcomes the activating spring to force the
F-13
E
B
C
D
A
Fig 9.
9813/5100-1
Section F - Transmission
Traction Motor / Reduction Gear
brake piston across, thereby un-clamping the friction and
counter plates to release the parking brake. When parking
or stopping the machine the shuttle function causes the
pressurised oil in the parking brake cylinder to be released
via the motor case drain. The brake piston is forced back
by the activating spring to clamp the friction and counter
plates and operate the parking brake.
Operation
F-13