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MF 5460, 5475 Power Shuttle gearbox - Selector cover plate
Massey Ferguson 5460, 5475 tractors are equipped with a selector cover
plate fitted with a single control lever. This lever is located on the
rear of the cover plate and is used to select the four basic gears and
the Hare/Tortoise (Hi-Lo) function.
Hare / Tortoise range shifting is carried out via a pulse button
integrated into the transmission lever handle. The action is only
validated when the lever is in the
Neutral position. A sensor "C" fitted to the selector cover plate buzzes
to warn the user that a gear is engaged when the hand brake is on.
(1) Oil return port (2) Earthing lug (3) Screw (4) Screw (5) Temperature
sensor (6) Stud and nut (9) Selector cover plate (10) Return ports (13)
Gear control finger (14) Speed grid (15) Screw (16) Support (17)
Locating ring (18) Ball bearing (19) Screw (20) Spring (21) Washer (22)
Circlip (25) Seal (26) Guide ring (27) Seal (28) Neutral position switch
(29) Hexagonal spacers (31) Plunger (33) Washer (34) Toggle switch (35)
Indexing rod
Massey Ferguson 5460, 5475 transmission
lever
Selecting 1st - 2nd ratios
The transmission lever (2) operates lever L and engages the finger (13)
in the 1st - 2nd fork.
The first ratio is obtained by moving lever L upwards and the second
ratio downwards.
Simultaneously, the toggle switch (34) secured to pin A pivots and moves
the plunger (31) thus locking the indexing rod (35) and the
Hare/Tortoise fork.
Selecting 3rd - 4th ratios
In this configuration, the finger (13) secured to pin A is engaged in
the 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 rod (35) and Hare/Tortoise fork is
identical to that used for the 1st - 2nd ratios.
Hare/Tortoise range
Hare/Tortoise range shifting is validated when the transmission lever is
in the Neutral position.
If the button located on the transmission lever
handle is activated and
if switch (28) has confirmed the Neutral position of the lever, the
electronic system of the MF 5460, 5475 tractor allows voltage to be
supplied to or cut off from 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 plate opens and supplies 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 into the 17 bar system.
Tortoise position
When the pulse switch is activated again, the solenoid valve is closed,
and the pressure drops in chamber "a".
The piston (1) moves back due to 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 and function of Hare / Tortoise range locking elements
Toggle switch
This is one of the main elements of the Hare / Tortoise range locking
system. It is freely mounted on pin A and pivots with it by means of a
flat section.
Function one - It moves the plunger (31) towards the indexing rod (35)
and locks the latter during gear engagement.
Function two - Via its opposite face it controls the neutral position of
pin A (transmission lever) using the switch (28).
Indexing rod
At one end there are two different locking grooves:
- the narrow groove: Hare position;
- the wide groove: Tortoise position.
The other end is designed to house the stop of the Hare / Tortoise fork.
It avoids any unwanted reverse movement of the Hare / Tortoise fork in
case of electronic or
hydraulic malfunction.
Plunger (31) - Spherically shaped at each end, it moves between the
toggle switch (34) and indexing rod (35). It acts as the system lock,
whatever range is
engaged. Switch (28) - It is controlled by the toggle switch. It informs
the tractor electronic system when the transmission lever is in neutral
position.
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