Massey Ferguson 5400 - Issue 1.a
05D02.10
GBA20 Speedshift with Power Shuttle
Hydraulic action: direct drive reduction
(Fig. 5)
The range shifting is carried out via a pulse button inte-
grated into the pommel of the gear shift lever. This
button activates the solenoid valve mounted on the
power shuttle clutch unit located to the right and to the
front of the gearbox. The solenoid valve simultane-
ously supplies the chamber of pistons (48) and (28).
The brake piston (48) then presses against the inter-
mediate plate (20) which compresses the Belleville
washer (18) thus releasing disc (21) and the planet
carrier assembly (50). At the same time, the clutch
piston (28) joins the intermediate plates (30) and the
discs (42) driven by hub (15). As the intermediate
plates are firmly secured to the planet carrier with
three tabs, the driving movement is transferred from
the input shaft (36) to the hub (15) and to the clutch
unit which drives the planet carrier (50). The primary
shaft (36), the planet carrier assembly and the sun
gears turn at the same speed as the secondary shaft
(5), thus ensuring direct drive, gear ratio 1.
42 5
28
21
20
18
48
36
15
50
MA-05-00360B
30
Fig. 5
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