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General - GBA20 with Power Shuttle Operation
C . Operation
N
: On GBA20 gearboxes with Power Shuttle, the
OTE
gear synchronisers (1st - 2nd and 3rd - 4th) and the
Hare / Tortoise synchroniser are double cone type.
The double cone synchroniser has the following advan-
tages: increased reliability and greater resistance to
transmission effort.
Synchronisers (double cone)
Parts list
(Fig.
3)
(1)
Sliding coupler
(2)
Cone (brake)
(3)
Coupling flange
(4)
Ball
(5)
Pressure element
(6)
Spring
(7)
Ring
(8)
Cone (brake)
Locked position
(Fig.
When the sliding coupler (1) moves towards the pinion
to be locked, it is pressed against the ring (7) by the
balls (4) and pressure elements (5).
The ring (7) transmits pressure received to the
cones (2) and (8) to set a synchronisation speed.
When the synchronisation is set, the sliding coupler (1)
can mesh and lock noiselessly with the teeth of the
coupling flange (3).
Neutral position
(Fig.
Sliding coupler (1) is in the middle position. The
balls (4) are pushed into the V groove of the sliding
coupler by pressure springs (6). The pinions can turn
freely on the shaft. In this neutral position, the sliding
coupler is locked by three balls held in place by the
pressure springs.
05A02.10
3)
3)
1
5
4
V
8
5
MA-05-00301B
Massey Ferguson 5400 - Issue 1.a
3
6
2
7
4
6
1
7
2
8
3
Fig. 3
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