Specifications, Service and Repair of Farm and Lawn Tractors

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Massey Ferguson 3115, 3080 Gearbox - Input unit


The Massey Ferguson 3080, 3115, 3125, 3105 tractors input gearbox is in the form of an interchangeable module fitted at the input end of the gearbox.

It is made up of two quite separate parts: the speedshift (if fitted) and the reversing mechanism.

The speedshift: This is an independant device which allows the input speed to the main gearbox to be doubled.

It is situated at the front of the input gearbox and consists of a hydraulic clutch coupled to epicyclic reduction gearing.

Reverse shuttle: This is housed in the enclosure at the rear of the input gearbox and consists a set of two gears operated via a synchromesh mechanism.

Paired idler gears allow the direction of rotation to be reversed.

Removal:

- To enable the layshaft bearings to be shimmed correctly, the gearbox must be removed from the tractor.

- If the input gearbox is to be replaced as a complete assembly, the layshaft will need to be shim-med again.

MF 3115, 3080 tractors:

- Split the tractor between the gearbox and the rear axte.

MF 3080 tractors:

- Separate the gearbox from the engine.

Carry out procedures 11 and 12 (after suspending the gearbox in slings). Remove the PTO shaft.

- Remove the input gearbox: carry out procedures 7 to 12.

- Remove the clutch slave cylinder assembly.

- To avoid damaging the seals, it is best not to remove the release bearing mounting from the slave cylinder.

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

- Undo the three bolts holding the slave cylinder assembly in position.

MF 3115 tractors:

- Separate the gearbox from the engine.

- Carry out procedures 6 to 12.

Removing the clutch slave cylinder assembly

Massey Ferguson 3080 tractors:

- Refit the clutch slave cylinder assembly.

- Clean the 3 bolts and apply Loctite 421 to them.

- Fits the bolts and tighten them to torques of: 8 mm t : 25-35 Nm 10 mm L : 50-70 Nm

- Refit the rubber boot and push the thrust washer mounting back in.

- Refit the input gearbox; carry out procedures.

- Refit the gearbox to the engine.

- The following procedures are to be carried out from 15,16,17 and 18 (after the gearbox has been suspended in slings).

MF 3115 tractors:

- Refit the clutch slave cylinder assembly.

- Carry out procedures 7 and 8.

- Fit the gearbox to the engine.

- The following procedures are to be carried out from 15 to 18 (except a) 19 to 22.

- Re-unite the tractor at the joint between the gearbox and rear axle.

- Perform road test on speedshift. reversing mechanism and gears.

- Check that there are no leaks at the selector cover joint and the gearbox to rear axle joint.

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