Massey Ferguson 5400 - Issue 1.a
08E01.3
GPA20 multidisc 4WD clutch
A . General
The front axle clutch assembly is fitted in the lower
part of the rear axle housing. An inspection cover
located under the housing provides access to the
mechanism, which comprises:
- a shaft (25) turning on two taper roller bearings fitted
in the groove of the axle housing,
- a hydraulic clutch assembly integral with the rotating
shaft,
- a bell gear (15) centred on the shaft by a ring (43),
driving the clutch discs (36).
The helical bell gear (15) is constantly meshed to the
pinion (7) on the drive pinion.
The shaft is shimmed to obtain an operating clearance
between 0 and 0.1 mm using shims (20) positioned
between the cap (22) and the cup (18).
B . Operation
Declutching
The 4WD solenoid valve sends the 17 bar pressure
into the shaft (25) via a channel drilled in the shaft
housing, and the ring (11).
The cover (30) moves on the hub (40) and pulls the bell
(42) which compresses the Belleville washers (34) and
(35), releasing the discs (36). The bell gear (15) integral
with the ring (43) turns idle on the shaft.
Clutch
The pressure drop releases the Belleville washers,
which push the bell (42) so that it meshes with the bell
gear (15), which in turn drives the shaft (25). The oil
then returns to the housing via the solenoid valve.
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