________________________________________________________________________________
MF 5460, 5465 Mechanical reverse shuttle gearbox - Speedshift
The Speedshift unit is mounted between the hydraulic mechanism of the
engine clutch and the mechanical reverse shuttle. It is a hydraulically
controlled gear shift system providing two input ratios to the GBA20
gearbox.
This function is provided by:
- a multidisc hydraulic clutch;
- an epicyclic gear train consisting of a planet carrier with three
double planet gears, an input sun gear and an output sun gear;
- a planet carrier hydraulic braking system.
The design of the Speedshift allows ratio shifting while driving without
declutching, even at full load. Legislation in force in certain
countries limits forward speed to 30 kph. In this case, the sun gears
(6) and (7) and planet gears (12) of the Speedshift epicyclic gear train
should be positioned as a pic.
Massey Ferguson 5460, 5465 Speedshift
(2) Screw (3) Screw (4) Ring (5) Secondary shaft (6) Input sun gear (30
kph) Output sun gear (40 kph) (7) Input sun gear (40 kph) Output sun
gear (30 kph) (8) Planet gear pins (9) Planet carrier unit (10) Seal (7
mm thick) (11) Seal (10 mm thick) (12) Double planet gears (13) Housing
(14) Spacer (15) Hub (16) Needle roller bearing (17) Friction washers
(18) Spring washer (Belleville) (19) Rivets (20) Thrust plate (21) Brake
disc (22) "O" ring (23) "O" ring (24) "O" ring (25) Hydraulic cover
plate (26) "O" ring (27) Front cover plate (28) Clutch piston (29) "O"
ring (30) Intermediate plates (31) Rings (32) Needle roller bearing (33)
Ring carrier (34)
Threaded plug O 8(35) Threaded plug O 10 (36) Primary shaft (37) Circlip
(38) Tab washer (39) Washer (40) Ball bearing (42) Discs (43) Spring
washers (46) Seal
(47) Seals (48) Brake piston (50) Planet carrier assembly (65) Needle
roller bearing (66) Seal
(2) Screw (3) Screw (4) Ring (5) Secondary shaft (6) Input sun gear (30
kph) Output sun gear (40 kph) (7) Input sun gear (40 kph) Output sun
gear (30 kph) (8)
Planet gear pins (9) Planet carrier unit (10) Seal (7 mm thick) (11)
Seal (10 mm thick) (12) Double planet gears (13) Housing (14) Spacer
(15) Hub (16) Needle roller
bearing (17) Friction washers (18) Spring washer (Belleville) (19)
Rivets (20) Thrust plate (21) Brake disc (22) "O" ring (23) "O" ring
(24) "O" ring (25) Hydraulic
cover (26) "O" ring (27) Front cover plate (28) Clutch piston (29) "O"
ring (30) Intermediate plates (31) Rings (32) Needle roller bearing (33)
Ring carrier (34)
Threaded plug O 8 (35) Threaded plug O 10 (36) Primary shaft (37)
Circlip (38) Tab washer (39) Washer (40) Ball bearing (42) Discs (43)
Spring washers (46) Seal
(47) Seals (48) Brake piston (50) Planet carrier assembly (65) Needle
roller bearing (66) Seal
Mechanical action – boosting
In this position, the hydraulic components are not supplied and the
Speedshift operates in a mechanical manner. The oil in the chamber of
pistons (28) and (48)
returns to the housing via channel "C" and the solenoid valve located on
the front right-hand side of the MF 5465, 5460 gearbox.
As the oil pressure has dropped, the planet carrier assembly (50) is
locked in rotation by the Belleville washer (18) which compresses the
thrust plate (20) and
immobilises the disc (21) splined with the planet carrier assembly.
Drive from the primary shaft (36) is transferred to the input sun gear
(7) splined to the shaft. The sun gear (7) drives the double planet
gears (12) idle-mounted on
the pins (8). The planet gears in turn drive the output sun gear (6)
firmly attached to the secondary shaft (5), ratio 1.26.
Hydraulic action: direct drive reduction
The range shifting is carried out via a pulse button integrated into the
Massey Ferguson 5465, 5460 transmission lever handle. This button
activates the solenoid
valve fitted at the front right-hand side of the GBA-20 gearbox. The
solenoid valve simultaneously supplies the chamber of pistons (48) and
(28).
The brake piston (48) then presses against the thrust 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 the hub (15).
As the intermediate plates are firmly secured to the planet carrier with
three lugs, drive is transferred from the input shaft (36) to the hub
(15) and to the clutch
assembly 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.
________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________