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B . Operation
Gear shift lever
(Fig.
Selecting 1st - 2nd gear ratios
The gear shift lever (2) operates lever L and engages
the finger (13) in the 1st - 2nd gear fork.
The first ratio is obtained by moving lever L upwards
and the second ratio downwards
ously, the toggle (34) integral with pin A pivots and
moves plunger (31) which thus locks the indexing pin
(35) and the Hare / Tortoise fork.
Selecting 3rd - 4th gear ratio
In this configuration, the finger (13) integral with pin A
is engaged in 3rd - 4th gear fork.
The third ratio is obtained by moving lever L upwards
and the fourth ratio downwards
The locking principle of the indexing pin (35) and Hare
/ Tortoise fork is identical to that used for the 1st - 2nd
ratios.
Massey Ferguson 5400 - Issue 1.a
Selector cover - GBA20 with Power Shuttle
3)
(Fig.
3). Simultane-
(Fig.
3).
Hare / Tortoise range
The shifting of the Hare / Tortoise range is validated
when the gear shift lever is in the Neutral position.
If the button located on the pommel of the gear shift
lever is pressed and if switch (28) has confirmed the
Neutral position of the lever, the electronic system of
the tractor enables the supply or cutting off of voltage
to the Hare / Tortoise solenoid valve in order to obtain
movement of the fork in the required range.
Hare position
The Hare/Tortoise solenoid valve, fitted on the lower
part of the right-hand cover (see section 9) opens and
feeds chamber "a" located behind piston (1)
The piston moves forward, and pushes the fork (Hare
/ Tortoise).
The oil contained in chamber "b" is discharged into the
Tortoise channel, and returns in the 17 bar circuit.
Tortoise position
A fresh activation of the pulse switch
closure of the solenoid valve, and a drop in pressure in
chamber "a"
(Fig.
4). The piston (1) moves back under
the action of the 17 bar pressure exerted on the
annular face.
The oil contained in chamber "a" returns to the
housing via the Hare channel and the solenoid valve.
Identification of Hare / Tortoise function
ports
See
Fig.
5.
(Fig.
4).
(Fig.
3) results in
05E02.9
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