Massey Ferguson 5400 - Issue 1.a
06D01.3
GPA20 handbrake unit and control
A . General
The handbrake assembly is fitted on the drive pinion. It
consists of a mechanism placed between three friction
discs splined to the drive pinion.
The mechanism comprises two cast iron plates held by
springs and separated by balls housed in ramps.
The three discs are fitted to the drive pinion as follows:
- two discs separated by an intermediate plate
between the thrust plate (29) and the mechanism,
- a disc between the mechanism and the closing plate
(24).
B . Operation
When the handbrake lever in the cab is pulled, the cam
(14) is moved via the pin (20). The cam pushes the
guide rod link (13) which causes the plates of the
mechanism (31) to rotate and move apart. The discs
(30) are thus compressed between the moving plates
(31), the intermediate plate (34), the closing plate (24)
and the thrust plate (29), preventing the drive pinion
from rotating.
When the handbrake lever is released, the spring (17)
moves the cam (14) to the rest position and the mech-
anism is closed by its springs.
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