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MF 5435, 5455 mechanical reverse shuttle gearbox - Selector rails
On the gearbox
The selector rail (7) holding the different forks is located on the
right-hand side of the MF 5435, 5455 tractor gearbox, on the selector
cover plate side. It passes
through the gearbox housing and the Hare and Tortoise range control
piston (13). It is held in position by a set screw (8).
A cup plug (9) closes off the bore at the front and a cover plate (15)
closes the rear end. The 1st - 2nd (5) and 3rd - 4th (6) forks are not
adjustable. The creeper gear
fork (28) is adjustable by mechanical pressure.
Two adjustments are necessary to obtain the correct functioning of the
fork (20) in both ranges (Hare / Tortoise):
- adjustment of the space between the fork pads and the synchroniser
sliding coupler;
- adjustment of the stop (18), in relation to the position of the
indexing rod fitted on the selector cover plate.
Massey Ferguson 5435, 5455 creeper gearbox may be fitted as an option. A
super-creeper gearbox may also be fitted as an option. In this case, the
end-of-travel
pin (29) is not fitted.
On the input unit
The mechanical reverse shuttle synchroniser is controlled by: a
selector; a selector rail; a fork.
The selector and the fork are adjustable.
(1) Plug (2) Spring (3) Detent plunger (5) 1st - 2nd Fork (6) 3rd - 4th
Fork (7) Selector rail (8) Set screw (9) Cup plug (10) Cylinder (11) "O"
ring (12) "O" ring (13)
Hare and Tortoise range piston (14) "O" ring (15) Cover plate (16) Screw
(17) Screw (18) Locking stop (19) Adjustment screw(20) Hare/Tortoise
fork (26) Nut (27)
Locking screw (28) Creeper gear fork (29) End-of-travel pin
Creeper gear fork
- Remove the selector cover plate.
- Remove the right-hand hydraulic cover plate.
- Remove the creeper gear fork
Hare / Tortoise fork
- Remove the selector cover plate.
- Remove the right-hand hydraulic cover plate.
- Remove the creeper gear fork (if fitted).
- Move the selector rail forward.
- Disassemble the hydraulic components (ram) of the Hare / Tortoise
mechanism.
- Take out the range fork.
1st-2nd and 3rd-4th gear forks
- Remove the selector cover plate.
- Remove the right-hand hydraulic cover plate.
- Remove the creeper gear fork (if fitted).
- Move the selector rail forward.
- Disassemble the hydraulic components (ram) of the Hare / Tortoise
mechanism.
- Take out the range fork.
- Move the selector rail backwards.
- Take out the 1st-2nd and 3rd-4th gear forks.
Main selector rail
- Remove the selector cover plate.
- Remove the right-hand hydraulic cover plate.
- Remove the creeper gear fork (if fitted).
- Move the selector rail forward.
- Disassemble the hydraulic components of the Hare / Tortoise mechanism.
- Take out the range fork.
- Take out the 1st-2nd and 3rd-4th gear forks.
- Move the selector rail backwards as far as it will go and disengage it
through the selector cover plate opening.
Massey Ferguson 5435, 5455 Tractors with no creeper unit
The selector rail can also be removed through the front on tractors not
fitted with a creeper unit.
To do this it is necessary to:
- disconnect the MF 5435, 5455 tractor between the engine and the
gearbox;
- remove the gearbox spacer (only on tractors fitted with 6-cylinder
engine).
Reverse shuttle selector
- Remove the selector cover plate.
- Remove the reverse shuttle selector.
Shuttle fork
- Disconnect the MF 5435, 5455 tractor between the engine and the
gearbox.
- Remove: the selector cover plate; the reverse shuttle selector; the
input unit; the shuttle fork.
Shuttle selector rail - The shuttle selector rail is removed using the
same procedure as for the fork.
Mechanical reverse shuttle selector - Fork and selector rail
Reverse shuttle selector
- Remove the selector cover plate. Remove the screws (1). Remove the
selector (2).
- Clean the thread of the screws and the tapped holes in the selector.
Check that the screws turn freely in the tapped holes.
- Slide the selector onto the selector rail and adjust it.
- Engage forward and reverse positions, and vice versa, using the
selector rail to position the synchroniser components.
- Next, position the selector rail (3) in neutral. Fit the tool to the
gearbox.
- Secure it in place using two locally obtained screws.
Adjusting the selector
- Lightly smear the thread of the screws (1) with Loctite 242 or
equivalent.
- Bring face "F" of the selector (2) flush with the tool, using the
screws (1).
- Alternately and gradually tighten the screws (1) to a torque 35 Nm
without modifying the selector position.
- Install the selector cover plate.
Fork and selector rail
- Disconnect the Massey Ferguson 5435, 5455 tractor between the engine
and the gearbox.
- Remove the selector cover plate. Remove the input unit. Remove the
plug (7), the spring (8) and the detent plunger (5).
- The detent plunger (5) for the shuttle fork (6) has a different shape
from those fitted on the 1st / 2nd and 3rd / 4th forks of the gearbox.
- Take out the screws (3) from the fork (6). Remove the rail (4) and the
fork.
- Clean the thread of the screws and the tapped holes in the fork. Check
that the screws turn freely in the tapped holes.
- Slide the fork into the synchroniser sliding coupler. Slide the
selector rail (4) into the fork (6). Adjust the fork.
Adjusting the fork
The positioning of the fork (6) is obtained by the difference between
the centre line "Y" of the holes and the centre line "Z" of the indents
on the selector rail (5). A
different fork movement is obtained either by adjusting the front screw
or by adjusting the rear screw (3) according to the adjustment required.
Install the detent plunger (5), the spring (8) and the plug (7). Tighten
the plug to a torque of 50 - 70 Nm. When disassembling all detent
plungers (gearbox and input
unit), the positioning of the reverse shuttle selector rail detent
plunger must be respected.
Lightly smear the thread of the fork screws with Loctite 242 or
equivalent. Fit the screws. Position the locked fork towards the front.
Hold the synchroniser sliding
coupler up against the gear. Pre-adjust the fork using the
above-mentioned principle.
Check that the front pads of the fork are not driven hard against the
synchroniser sliding coupler. Repeat the operation (locked fork towards
the rear).
Check that the
rear pads are not driven hard against the synchroniser sliding coupler.
The correct adjustment is obtained when clearance between the fork pads
(front and rear)
and the synchroniser sliding coupler is nearly equal, in both the
forward and reverse positions.
- Alternately and gradually tighten the screws (3) to a torque 35 Nm
without modifying the fork adjustment.
- Install the input unit. Adjust the selector.
- Install the selector cover plate.
- Reconnect the MF 5435, 5455 tractor between the engine and the
gearbox.
- Top up the oil level in the housings. Check it using the gauge at the
rear of the centre housing.
- Bleed the hydraulic mechanism of the engine clutch.
- Carry out a road test of the reverse shuttle (forward and reverse
positions) and the control assembly.
- Check the tightness of the mating faces and hydraulic unions.
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