Massey Ferguson 5400 - Issue 1.a
06C01.3
GPA20 brake piston
A . General
The brake pistons are housed in two lateral cavities of
the rear axle housing, concentric with the mating face
of each trumpet housing (see chapter 6).
They comprise a shouldered part and are guided by 3
locating pins force-fitted in the housing.
Sealing is ensured by two O’rings fitted in grooves of
the rear axle housing. Each piston is controlled by a
master cylinder topped by a tank whose level is kept
constant by the residual oil flow from the 17 bar valve.
Each piston acts directly on a friction disc with inserted
hub, fitted to the trumpet input sun gear and a plate
centred by pins and bearing on the ring gear of the final
drive unit. When the brake is released, a self-adjusting
device ensures a minimal clearance between the
piston and the brake disc and maintains a constant
pedal travel.
The brake discs are lubricated by an oil flow. This
continuous flow from the lift valve is directed to the
brake discs via a pipe and a restrictor union screwed
onto the trumpet housing. The oil circulating between
the discs and the pistons lubricates the braking
surfaces when they are not in use and cools the brakes
when they are used.
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