Speedshift Removing and Installing operations



Disconnect the tractor between the engine and the gearbox. Drain the gearbox and the rear axle if required. Remove the engine clutch mechanism. Remove the input unit. Position the unit vertically.

Removing and disassembling the front cover plate


Remove the screws (2).
Manually remove the shaft assembly (36), the ring carrier (33) and the front cover plate (27).
Discard the seals (24), (46) and (47).
Remove and discard the rings (31).
Remove the circlip (37).
Remove the tab washer (38) and washer (39).
Separate the shaft (36) from the ring carrier (33).
Remove the piston (48) by lightly tapping the cover plate with a wooden block or using a jet of compressed air.
Separate and remove the ring carrier (33) from the cover plate (27).
Remove the seals (22) and (23) and discard them. Rivets (19) ensure that the oil channels are sealed.



Removing, splitting and disassembling the planet carrier assembly


Remove the brake disc (21), thrust plate (20), Belleville washer (18) and planet carrier assembly (50).
Put the planet carrier assembly on a workbench with the unit (9) turned upwards.
Remove the screws (3).
Separate the unit (9) from the hydraulic cover plate (25) while holding sun gears (6) and (7).
The text and figures in this section concern the disassembly of a planet carrier for a forward speed of 40 kph.
Remove the input sun gear (7), visually identifying the direction of the lubricating grooves.
Drive out the pins (8) using a drift and a hammer. The pins are fitted tight in the thickest part of the planet carrier with the lubrication hole turned towards the hydraulic cover plate (25).

Remove the planet gears (12).
Recover needle roller bearings (16), spacers (14) and washers (17).
Remove the output sun gear (6).
Remove the splined hub (15).
Remove the intermediate plates (30), discs (42) and spring washers (43).
The clutch consists of:
- two friction discs;
- two spring washers;
- three intermediate plates.
Remove the piston (28) by lightly tapping the cover plate (25) on a wooden block or using a jet of compressed air.
Remove the seals (26) and (29) and discard them.



Reassembling the planet carrier 
Clean and check all components. Replace those that are defective.
Lubricate the needle roller bearings (16).
Make sure that the radial holes and axial channel for the lubrication of pins (8) are not blocked.
Tractor speed can be between 30 and 40 kph. Each speed is obtained by turning the planet gears and sun gears of the Speedshift epicyclic gear train.
The sun gears have different numbers of teeth:
- sun gear (6): 36 teeth
- sun gear (7): 39 teeth



The text and figures in this section concern the reassembly of a planet carrier for a forward speed of 40 kph.
Put the output sun gear (6) in the unit (9), turning the sun gear lubricating grooves towards face "F" of the unit.
Install the needle roller bearings (16), separated by a spacer (14) in a planet gear (12).
Put an "assembled" planet gear in the unit, the 18-tooth gear turned.Each double planet gear is identified with one, two or three punchmarks on one of its faces which is not necessarily the 18-tooth gear. In this case, make the same marks on the aforementioned gear using an appropriate pen. A punchmark corresponds to the alignment of two teeth.



Position the washers (17).
Centre the planet gear and washers with a guide pin Ø 16 mm, L = 80 mm.
Insert the pin (8) into the free bore on face "F" of the unit (9). Fit it partially set back, with the radial lubricating hole "a" turned outwards and the end of central channel "C" turned towards face "F".
Repeat to assemble the two other planet gears. During these operations, position the three planet gears according to marks "R" so that they run in a line corresponding with "O".
After final assembly of the pins (8), check again that the marks are correctly aligned. Incorrect alignment may make it impossible to assemble combined parts or cause damage to the epicyclic gear train.
Install the input sun gear (7) with the lubricating groove turned towards the output sun gear (6).


Refitting the hydraulic cover Plate


Clean and check all components. Replace those that are defective.
Make sure that the three holes of the 17-bar channel on the hydraulic cover plate (25) are not blocked.
Install the lubricated seals (26) and (29) and onto the piston (28).
Lubricate the mating faces of piston seals in the hydraulic cover plate.
Position the piston in the cover plate, turning the grooves towards the operator.
Install the piston (28) using a plastic hammer, gradually and alternately striking around the circumference of the piston. Check that there are no fragments of "O" rings after fitting.
Install the splined hub (15).
Install an intermediate plate (30), a disc (42) and a spring washer (43). Continue stacking parts, ending with an intermediate plate. Arrange the cut section of spring washers in opposite directions.

Assembling the planet carrier
Screw two diametrically opposed guide studs in the hydraulic cover plate (25).
Assemble the planet carrier unit (9) on the hydraulic cover plate (25) while holding the sun gears (6) and (7). Position the unit and the cover plate so that the balancing marks (ground in marks) are on opposite sides as far as possible.
Refit the screws (3). They must be tightened to a torque of 14 - 20 Nm.
Strike pins (8) definitively against the hydraulic cover plate (25) with a pin punch.
Check that:
- the discs (42) are not compressed;
- the planet gears (12) and sun gears (6) and (7) turn freely.
Install the planet carrier assembly (50) on the shaft (5).
Position the Belleville washer (18).
Position the thrust plate (20) in the housing (13).
Install the brake disc (21) on the planet carrier assembly.


Assembling and refitting the front cover plate


Clean the cover plate. Make sure that the 17-bar channel and the lubrication channel are not blocked. Check that the sealing rivets (19) are present.
Install the seals (22) and (23) on the piston (48).
Lubricate the mating faces of the piston seals in the cover plate (27).
Position the piston in the cover plate, turning the grooves towards the operator.
Install the piston (48) using a plastic hammer, gradually and alternately striking around the circumference of the piston. Check that there are no fragments of "O" rings after fitting.

If required, recondition the ring carrier (33):
- check that channels in the ring carrier are not blocked. The ball bearing (40) should be inserted correctly in its hole;
- with a press and suitable fixture, fit:
- the needle roller bearing (32), 29.3 ± 0.1 mm from face F.
Check that the needle rollers turn correctly;
- the lubricated seal (10), 14.2 mm from face F.
Ensure the seal does not cover the decompression holes;
- the lubricated seal (11), 0.3 - 0.8 mm from face F.
Ensure the seal does not cover the decompression holes.

Check that plugs (34) and (35) are present on the cover plate.
Smear Loctite 510 or equivalent on the mating face of the ring carrier on the cover plate, avoiding the hydraulic ports.
Position the ring carrier on the cover plate, making sure that the low pressure (17 bar) and lubrication holes correspond respectively with those on the cover plate; Fit the ring carrier (33).
Hold the ring carrier temporarily in place using three locally obtained M8 screws. These screws are used to compress the ring carrier onto the cover plate while the seal is drying to ensure high-quality tightness of interfaces.
Check that the lubrication holes on the shaft (36) are not blocked. If the shaft needle roller bearing (65) needs replacing.



Slide the shaft in the ring carrier.
Install the washer (38) and circlip (37).
Test-fit the new rings (31), making sure they turn freely in the grooves.
After this check, remove the rings and smear with miscible grease.
Install the rings in their respective grooves, making sure:
- that they do not exceed the circumference of the ring carrier;
- their ends overlap correctly.
The slightest damage to rings may cause a leak followed by a pressure drop and incorrect operation of the Speedshift.
Smear the washer (39) with grease and put it on the inner face of the cover plate (27).
Install the new seals (24), (46) and (47) on the housing (13).
Manually Install the shaft (36), ring carrier (33) and front cover plate (27) assembly using the same procedure as for removal.
Install and tighten the screws (2) to a torque of 25 - 35 Nm.

Extracting and replacing the primary shaft needle roller bearing


Extract the needle roller bearing (65) from the shaft (36 using a slide hammer puller. Discard it.
Replacement
Ensure there is no dirt inside the primary shaft (36).
Install a new bearing (65) 15 - 16 mm from face F of the primary shaft using a press and suitable fixture.
After fitting, check that the bearing's needle rollers turn correctly.
Install the input unit.
Install the hydraulic mechanism of the engine clutch.
Reconnect the tractor between the engine and the gearbox.