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Massey Ferguson 3095, 3125 Tractor Gearbox – Speedshift

The speedshift unit is mounted at the front of the Massey Ferguson 3095, 3080, 3105, 3125 gearbox input. It is a hydraulically operated gearchange device which provides two different input ratios to the main gearbox.

It does this by means of:

- a multidisc hydraulic clutch,

- an epicylic gear train consisting of a planetary carrier with three twin planetary gears, an input sun gear and an output sun gear,

- a system for braking the planetary carrier hydraulically. The design of the speedshift allows the ratios to be changed on the move, even under full load, without declutching.

Different versions

The following versions can be obtained as a function of the number of teeth on sun gears 6 and 7 and the order in which they are fitted: 30 km/h or 40 km/h version/version with super creeper gears.



Fig. 3

30 Kph and super creeper version : stepdown 40 Kph version : stepup (Fig. 3) - in this mode (Fig. 3), there is no supply to the hydraulic components and the speedshift operates as a purely mechanical transmission.

Oil in chamber of pistons (28) and (48) returns to the housing via the gallery C and the solenoid. The drive from the hollow primary shaft (36) is transmitted to the input sun gear 7 by the splines which secure the gear to the shaft. Sun gear R drives the compound planetary gears 12 which are mounted to rotate freely on spindles 8.

The planetary gears in turn drive the output sun gear 6, which is splined to the hollow secondary shaft (5). in one of the following ratios: 30km/h 1.26 stepdown - 40km/h 1.26 stepup - super creeper 7.8 stepdown.

Since no hydraulic pressure is applied, the planetary carrier assembly (50) is locked against rotation by a Belleville spring disc (18) which applies pressure to pressure plate (20) and thus stops disc (21) from turning, the latter being locked to the planetary carrier assembly in rotation by splines.

Hydraulic operation - direct transmission

The range is changed by actuating the solenoid valve. which then feeds hydraulic oil to the chambers behind pistons (48) and (28) simultaneously.

Braking piston (48) is then applied to pressure plate (20), which compresses the Belleville spring disc (18), thus releasing disc (21) and the planetary carrier assembly (50). At the same time clutch piston (28) clamps together pressure plates (41), (44), (47) and the discs (42), (45) which are driven by hub (15).

Since the pressure plates are secured to the planetary carrier by three lugs, drive is transmitted from the primary input shaft (36) to the hub (15) and from there to the clutch assembly which transmits it to the planetary carrier (50).

The primary shaft (36) and the planetary gear and sun gear assembly turn at the same speed as the secondary shaft (5) thus giving direct transmission in the ratio of 1/1.

Front cover operations

Fig.5

Removing the front cover tractors:

- Split the tractor between the engine and gearbox Massey Ferguson 3125 Tractor

- Split the tractor between the engine and gearbox.

- Remove the PTO shaft. Withdraw seal (52).

- Remove the bleed and supply pipes to the clutch assembly.

- Drain the gearbox only of oil. Unscrew bolts (24) (Fig.6).

- Screw two pilot pins into the gearbox housing in diametrically opposed positions (Fig.6).

- Unscrew the three bolts (49) a little at a time, taking them in order (Fig.6).

- Remove cover (27) together with shaft (36) (Fig.6). Discard O-rings (1) and (2), (19) and (51).

- In anticipation of future rationalisation of the design of the speedshift, the former 6-lugged friction disc has been replaced by one with 40 internal splines.

- The hydraulic cover and the planetary carrier cover, and the bolts for securing them, have also been replaced by new covers and bolts adapted to the design with the splined disc.

- Take out disc (21), pressure plate (20), Belleville spring disc (18) and planetary carrier assembly (50).



Fig.6

Disassembling the front cover:

- Extract circlip (37) and take out lug washer (38).

- Withdraw shaft (36) from the front of the cover.

- Take out needle-roller bearing (53).

- Remove washer (39).

Massey Ferguson 3095, 3050 Tractor:

- Take out the clutch slave cylinder assembly

- You are advised not to take the release bearing out of the slave cylinder to avoid damage to the seals.

- Withdraw the release bearing from the slave cylinder for a distance of approx. 40 mm, take off the bellows.

- Unscrew the three bolts holding the cylinder in place.

Massey Ferguson 3125, 3115 Tractor:

Take out the clutch stave cylinder assembly - Unscrew the bolts holding me slave cylinder assembly in place and take the assembly out. Withdraw piston (48) from the cover.

All tractors:

- Remove seals (22) and (23) and discard them.

- MF 3095, 3125 tractors, new speedshift rings made of PTFE rather than cast iron and with gaps increased to 2.1/2.4 mm were introduced as from serial no. N155012.

- Remove seal rings 30 and 31 (discard these rings).

- Remove lip seals 34 and 35 and discard them.

- Take out needle-roller bearing (32) and discard it.

- Drive ring carrier (33) out of cover (27) (Work from the rear of the ring carrier using a plasticiaced mallet as a drift).

- Separating planetary carrier and cover assembly.

- Place the planetary carrier assembly (50) down on a bench (with the planetary carrier cover 9 on top).

- Unscrew bolts (3).

- Separate planetary carrier cover 9 from hydraulic cover 25 while holding sun gears 6 and 7 in position in planetary carrier cover (Fig.9).



Fig.9

Disassembling planetary carrier assembly

Take out the 1st sun gear:

- H36 tooth in 30 km/h version

- (6) 30 tooth in 40 km/h version

- (7) 30 tooth in super creeper version - Mark the direction in which the lubricating grooves in the sun gear should face when the gear is refitted.

Drive out spindles 8 with a drift and a mallet.

Take out the planetary gears 12.

Take out needle-roller bearings (11) and (16). spacers (14), and washers (10) and (17).

Take out the second sun gear:

- (6) 39 tooth in 30 km/h version (7) 36 tooth in 40 km/h version

- (6) 39 tooth in supper creeper version (Fig.2) . Bush (4) is a force fit in planetary carrier cover 9.

Disassembling the hydraulic cover:

- Take out splined hub (15).

- Take out pressure plate (41), disc (42), spring washer (43). pressure plate (44), disc (45), spring washer (46) and pressure plate (47).

- Withdraw piston (28) from cover 25.

- Remove O-rings (26) and (29) and discard them. In the supper creeper version, cover 25 and piston (28) differ from those in the 30 and 40 km/h versions.

The cross-sectional area of the piston is greater and this means that the diametric cutouts in the cover are larger.

Reassembling the planetary trier:

- Glean and check the parts and replace any which are faulty.

- Lubricate the needle-roller bearings. Check that the oilways in spindles 8 are not blocked, m/h version

- Fit the 39 tooth sun gear 6 into the planetary carrier cover. km/h version.

- Fit the 36 tooth sun gear 7 into the planetary carrier cover.

- Fit the tooth sun gear 6 into the planetary carrier cover.

- In all versions, fit the gear so that the lubricating grooves in it are facing towards face F of the planetary carrier cover. Fit a needle-roller bearing (11), a spacer (14) and a needle-roller bearing (16) into a planetary gear 12V

Fit an assembled planetary gear into the cover, with the following gears closer to face F in the respective cases:

- 21 tooth: 30 km/h version

- 18 tooth: 40 km/h version

- 27 tooth: super creeper version.

The planetary gear is marked with three punch marks made in a single face. Each punch mark indicates two teeth which line up. Fit washers (10) and (17).

Line up the planetary gear and washers with a locating rod made up locally : diameter = 16 mm, length = 80 mm.

Insert spindle 8 into the unobstructed bore in face F and drive it home with a mallet until it is slightly recessed below the face.

The oilway opening onto the circumference of spindle 8 must face outwards. The oilway opening onto the end face of spindle 8 must face towards face F of the planetary carrier cover.

Repeat procedures to fit the other two planetary gears.

The marks (punch marks) on the three planetary gears must line up with the centre on line spaced 120P apart. Once fitting of the spindles I8\ has been completed, re-check that the marks on the planetary gears line up as above.

If the marks do not line up properly, this will cause damage to the speedshift.

Fit the following sun gears in the respective versions :

- (7) 36 tooth: 30 km/h version

- (6) 39 tooth: 40 km/h version

- (7) 30 tooth: super creeper version

In all versions, fit the gear so that the lubricating grooves in it are facing towards face F of the cover.

Reassembling the hydraulic cover:

- Clean and check the parts and replace any which are faulty.

- Make sure that the three openings into the 17 bar passage in the hydraulic cover /2S\are not blocked.

- Lubricate O-rings (26) and (29) and fit them to piston (28).

- Lubricate the faces against which the piston seals bear in the hydraulic cover.

- Place the piston in the cover with the grooves facing towards the operator.

- Tap the piston (28) gradually home into the cover by working progressively round its face with a plastic-faced mallet.

- Once the piston is fitted, check that no pieces have been detached from the O-rings.

- Refit the splined hub (15) making sure it is correctly orientated.

- Refit pressure plate (47), spring washer (46), disc (45), pressure plate (44), spring washer (43), disc (42) and pressure plate (41).

- Place the gaps in spring washers (43) and (46) in diametrically opposed positions.

Reassembling the planetary carrier assembly:

- Screw two pilot pins into the hydraulic cover 25 in diametrically opposed positions.

- Fit the planetary carrier cover 9 to the hydraulic cover 25, while holding the sun gears 6 and 7 in position.

- Position the two covers so that the balancing marks (milled grooves or paint lines) are as far away from each other as possible.

- Refit bolts (3). Bolts must be tightened to a torque of 10-14 Nm.

- Tap spindles 8 in with a pin punch so that they butt against the hydraulic cover 25V

- Check: that discs (42) and (45) are not compressed / that planetary gears 12 and sun gears 6 and 7 can turn freely.

- Fit planetary carrier assembly (50) to shaft (5).

- Fit Belleville spring disc (18).

- Fit pressure plate (20) into housing (13).

- Apply three spots of grease («Amber Technical" or equivalent) to the lugs on the pressure plate.

- Engage friction disc (21) onto the planetary carrier assembly.

Reassembling the front cover:



Fig.20

- Clean the mating face and the rest of the cover. Make sure that the 17 bar passage and the lubricating passage are not blocked.

- Fit seals (22) and (23) to piston (48).

- Lubricate the surfaces in the speedshift cover against which the piston seals bear.

- Position the piston on the cover with its grooves facing towards the operator.

- Tap piston (48) gradually home into the cover by working progressively round its face with a plastic-faced mallet.

- Once the piston is fitted, check that no pieces have been detached from the O-rings.

- Clean the ring carrier and its mating face (check that the 17 bar passage and the lubricating pas-sage are not blocked). Ball (40) is crimped into the ring carrier.

Position (Fig.20) :

- needle-roller bearing (32) at 29.3 ± 0.1 mm from faceG - seal 34 at 43.8 mm from face H

- wide seal 35 at 0.3 - 0.8 from face G.

Use a press and a suitable press tool to position the bearing and seals perpendicular to the axis of the ring carrier.

- Having fitted seals 34 and /35, check that the two pressure-relief passages are not blocked.

- Apply a gasketing compound (Loctite Masterjoint 510 or equivalent) to the mating face of the cover to allow the ring carrier (33) to be fitted.

- Screw two pilot pins (1) into the cover. Engage the ring carrier in the cover bore.

- Check that the openings of the 17 bar passage and the lubricating passage in the ring carrier match up with the passages in the cover.

- Tap the ring carrier home in the cover. Lubricate seals 34 and 35V

MF 3095 Tractor:

- Refit the clutch slave cylinder assembly.

- Apply Loctite 241 to the three bolts and tighten them to torques of: 8 mm;25 - 35 Nm / 50 - 70 Nm.

- Refit the bellows and push in the release bearing.

- Refit the clutch slave cylinder assembly.

- Apply Loctite 241 to the bolts which hold the clutch slave cylinder assembly in place and tighten them to the following torques : 8 mm;25-35 Nm 10 mm/50 - 70 Nm.

MF 3095, 3125 tractors:

- Fit needle-roller bearing (1) so that it is 15-16 mm from the front face of the shaft.

- Lubricate shaft (36) and insert it in ring carrier (33) from the front.

- Make sure that the lubricating passages in the shaft are not blocked.

- Cover the splines in the shaft temporarily to avoid damage to seals 34 and 35.

- Refit washer (38) and circlip (37).

- Refit rings 30 and 31 and make sure that they turn freely in the grooves.

- Having made this check, remove the rings, preform them by reducing them to approximately 1 /3 of their original diameter, and coat them with miscible grease (Amber Technical or equivalent) to ensure that they will be held in position effectively when the front cover is being refitted.

- Fit the rings into their respective grooves, making sure that : they do not project from the circumference of the ring carrier, their ends are correctly overlapped.

- Even the slightest damage to the rings may give rise to leaks followed by pressure dropping in operation.

- Grease washer (39) and fit it into cover (27).

- Fit new O-rings (1) and (2), (19) and (51).

- Check that the locating pin is present in the reversing mechanism housing and that the two pilot pins are fitted.

Refitting the front cover:

- Fit front cover (27) together with shaft (36).

- Use the PTO shaft to make mating-up easier (only when fitting on tractor).

- Check that the 17 bar and lubricating passages in the cover match up with the openings in the housing.

- Refit bolts (24) and tighten them to a torque of 45 - 60 Nm.

- Fit bolts (49) and tighten them to a torque of 25 -35 Nm.

- Reconnect the supply and bleed pipes to the clutch slave cylinder assembly.

- Re-unite the tractor between engine and gearbox.

Massey Ferguson 3125 tractors:

- Top up the oil in the housing,

- Bleed the clutch circuit.

- Carry out a road test on the speedshift control.

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