Working principle of parking brake, Working principle of parking brake -10, Parking brake system -10 – JLG 600SC_660SJC Service Manual User Manual
Page 102
SECTION 5 - CAT CHASSIS (S/N 0300128000 TO PRESENT)
5-10
– JLG Lift –
3121157
Working Principle of Parking Brake
Parking brake is a negative brake consisting of a rotating
disk (frictional material), brake piston and spring. Refer to
the Figure 5-11.
Pressurized oil, when acting on parking brake release port
(Pp), is directed to cylinder chamber for parking brake
release, and pushes up brake piston with thrust corre-
sponding to the pressure surface area of brake piston.
This force overcomes spring force, pushing up brake pis-
ton and releasing parking brake. When parking brake
release port (Pp) is connected to the tank, pressurized oil
in cylinder chamber for parking brake release is released
into the tank, and brake piston pushed by spring force
activates the parking brake.
Figure 5-11. Parking Brake System
Pp port