Specifications, Service and Repair of Farm and Lawn Tractors

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Sisu diesel engine - Spacer (MF 6400 tractors)

The spacer is an important part of the chassis. It links the engine and the gearbox but also supports: the 4 WD shaft bearing (if fitted); the right- and left-hand cab supports. The top profile can support a 6-cylinder Sisu diesel engine. At the front, a cover closes the gearbox housing.

Removing - refitting the cover and replacing the lip seal

Disassemble the 6485, 6490, 6495, 6497, 6499 Massey Ferguson tractors between the engine and the gearbox. Drain the oil from the gearbox.



Removing the cover - Position the protector 3378012M2 on the mainshaft. Remove the screws marking their dimensions and positions. Take off cover (4). To remove, take out the cover and hold it in place using the tapped holes and two locally made screws of sufficient length. If necessary, discard (Fig. 5): the O'ring (3); the lip seal (1).

Replacing the lip seal - Drive the seal (1) (Fig. 5) off the cover (4). Thoroughly clean any dirt from the point where the seal meets the cover. Lubricate the rim of the new seal. Use an improvised fitting drift slightly smaller than the outside diameter of the seal to fit the seal up against the cover. Grease the lip and rear cavity of the seal.

Refitting the cover - Clean and visually check all components. Replace any defective parts. Lubricate and fit a new O’ring (3) (Fig. 5). On the shaft, position the protector used at disassembly. Check the presence: of locating pins on the spacer; of the shim (s) used to shim the clutch, on the pump cover.



If the cover had to be replaced, check or even redo the shimming of the PowerShuttle forward clutch. Smear the rim of the tapped holes with Loctite 5206 or equivalent. Screw two diametrically opposed guide studs on to the spacer. Refit the cover (4), with the D finger in the slot of the pump body (Fig. 9). Refit the screws (1) (2) in their respective positions (Fig. 10). Tighten to a torque of 36 - 46 Nm.



Remove the 3378012M2 protector. Top up the oil level in the housings. Check it using the sight glass located at the rear left-hand side of the rear axle. Assemble the tractor between the engine and the gearbox. Check: tightness of the mating face; correct operation of the Power Shuttle.

Removing - refitting the spacer

Disassemble 6485, 6490, 6495, 6497, 6499 Massey Ferguson tractors between the Sisu engine and the gearbox. If necessary, move apart the gearbox chassis reinforcements. Drain the oil from the gearbox and centre housing. If necessary and depending on the case, move the fuel tank apart from the gearbox, or remove it after draining.

Servicing on the cab - Split the cab from the supports on the front rightand left-hand sides. Using two straps fitted to the lateral handles, gently lift the front of the cab, while watching the rear suspension.

Servicing on the right-hand side of the 6400 MF tractor - Remove the cab/battery support fitted to the spacer. Remove: the flange and the lubricating pipe connected to the rear axle; the supply pipe (17 bar) and union coming from the control unit. Servicing on the left-hand side of the tractor - Remove the front fuel tank support. Remove the cab support connected to the spacer. After removing the supports, position two suitable stands at the front and at each side of the cab.



Removing the spacer - Remove cover (4). Remove the pipes (Fig. 12): 17 bar (1) low pressure; lubrication (2); diagnostics connector (3). Remove the screws and nuts fixing the spacer to the gearbox. Mark their length and position. Detach and split the spacer from the gearbox with the help of an operator.

Refitting the spacer - Clean the components. Replace any defective parts. Check the positioning and tightness of the studs on the gearbox. Clean off any Loctite previously applied to the mating faces. Grease the mating face of the spacer (gearbox side) with Loctite 5206 or equivalent. Check the presence of locating pins.



Refit the spacer with the help of an operator. Fit washers (4). Lightly smear the thread of the screws and nuts (Fig. 17) with Loctite 270 or equivalent. Tighten them in the following manner: collar screw (1) to a torque of 150 - 200 Nm; screws (2) and nuts (3) to a torque of 100 - 130 Nm. The union thread (1) and that of the diagnostic connector (2) are lightly smeared with Loctite 542 or equivalent. Refit the pipes. If the spacer had to be replaced, check or even redo the shimming of the PowerShuttle forward clutch. Refit cover (4).

Refit: the left-hand cab support fitted to the spacer. Tighten the screws to a torque of 200 - 260 Nm (Loctite 270); the front fuel tank support. Tighten the screws to a torque of 160 - 210 Nm (Loctite 270). Refit: the union and low pressure 17 bar pipe (2), the flange and lubricating pipe (1). Refit the cab support to the spacer. Tighten the screws to a torque of 200 - 260 Nm (Loctite 270). Fix the cab onto the front supports. If removed, refit the fuel tank. Top up the oil level in the housings. Check it using the sight glass located at the rear left-hand side of the rear axle.

Assemble the tractor between the engine and the gearbox. If necessary, position and adjust the chassis reinforcements. Check: the tightness of the unions and mating face of the spacer; the correct operation of the PowerShuttle and fuel gauge; automatic cab suspension.

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