Specifications, Service and Repair of Farm and Lawn Tractors

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Sisu Engine - Damper and flywheel (MF 5400/6400)

Engine/GTA1030 transmission



Removing-refitting the vibration damper - Split the MF tractor between the engine and the gearbox. Fit centring tool 3378262M1 home into the vibration damper and the flywheel bearing. This prevents the vibration damper from falling off. If required, immobilise the flywheel by sliding a locally made tool between the starter ring gear teeth and the motor adapter plate. Loosen and remove screws (7). Take off the vibration damper and centre it. Lightly lubricate the vibration damper splines with AS767 grease or equivalent.

Fit the following onto the flywheel: the vibration damper, with the F side facing the bearing; centring tool. On its own, the vibration damper is almost centred in the engine flywheel due to the regrinding of its external diameter. Centring tool 3378262M1 fine-tunes its central position and also turns the vibration damper in the flywheel to insert screws (7). Lightly smear the thread of the screws (7) with Loctite 270 or equivalent. Fit and tighten these screws to a torque of 110 - 130 Nm. Take off the centring tool. If necessary, release the engine flywheel. Assemble the tractor between the motor and the gearbox.

Removing-refitting the flywheel - Disassemble the tractor between the motor and the gearbox. Remove the vibration damper. Hold the engine flywheel in place with a mobile crane and suitable sling. Immobilise the engine flywheel using a locally made tool, as in operation 3. Remove two opposing screws (4) on the flywheel. Replace with two M12 guide studs. Remove the remaining screws (4). Move the engine flywheel apart. Remove the flywheel using the previously mentioned mobile crane and sling. If necessary: extract the engine flywheel bearing (10); loosen the guide studs. Degrease the mating faces of the flywheel and crankshaft. Dry each face using a jet of compressed air.



If removed, screw two diametrically opposed M12 guide studs into the crankshaft. Using the same tools as for removal, move the flywheel close to the engine, resting it against the crankshaft. For 74 ETA type Sisu diesel engines (MF 6499 tractor), position the circular plate (1) (Fig. 4). 66 ETA type Sisu diesel engines are (MF 6485, 6490, 6495, 6497 tractors) not fitted with the circular plate. Tighten a few screws (4).

Take out the guide studs. Immobilise the flywheel as in operation 3. Insert the remaining screws (4). Tighten all screws (4) to a torque of 150 Nm. Remove the sling. Release the flywheel. If the bearing (10) is defective, replace it with a new one. Refit the vibration damper. Assemble the tractor between the motor and the gearbox.



Replacing the sealed bearing - Disassemble the Massey Ferguson tractor between the engine and the gearbox. Remove the vibration damper. Extract the sealed bearing (10) using a slide hammer puller. Discard it. The sealed bearing also supports the gearbox input shaft. Clean the sealed bearing recess on the engine flywheel. Check inside the bearing housing for filings or knocks. Check that the inside cage of the sealed bearing (10) slides freely on end E of the gearbox input shaft (Fig. 7).

Fit the new sealed bearing home against the flywheel shoulder using a sleeve made locally to the following dimensions: Inside D = 55 +0/-0.1 mm; Outside D = 60 +0.1/-0 mm; L = 170 mm. The sleeve protects the sealed bearing during assembly. It directly applies the fitting load onto the bearing external diameter. Manually check the rotation of the sealed bearing after fitting. Refit the vibration damper.

Replacing the starter ring gear



Remove the vibration damper. Take off the flywheel. Position it flat on a workbench. Drill a hole 16 mm deep in the starter ring gear (2) using a 5 mm drill bit (Fig. 8). Split the starter ring gear with a suitable chisel. Release it from the flywheel (3) (Fig. 8). Heat a new starter ring gear (2) to 245C. Heating must be carried out in an oven. Hold the flywheel flat on a workbench. Turn the input teeth of the starter ring gear (2) towards the starter drive gear. Fit the starter ring gear on the flywheel. Quickly push it up against the flywheel shoulder. Allow it to cool slowly. Refit the flywheel. Refit the vibration damper.

Engine/GTA2520 and GTA1540 transmission

A vibration damper links the 4-cylinder (MF 5470, 5475) or 6-cylinder (MF 6485, 6490, 6495) Sisu diesel engine and the GTA2520 or GTA1540 transmission. The vibration damper's torque curve varies depending on whether the motor has 4 or 6 cylinders.



Removing and refitting the vibration damper - Disconnect the tractor between the motor and the gearbox. 6485, 6490, 6495, 6497 Massey Ferguson tractors fitted with a 4-cylinder or 6-cylinder Sisu diesel engine - Fully insert centring tool 3378712M1 (4-cylinder engine) or centring tool 3378262M1 (6-cylinder engine) in the vibration damper and the engine flywheel bearing. This prevents the vibration damper from falling off. If required, immobilise the flywheel by sliding a locally made tool between the starter ring gear teeth and the motor adapter plate. Loosen and remove the screws (7).

Remove the vibration damper and the centring tool. Lightly lubricate the vibration damper splines with AS767 grease or equivalent. 5470, 5475 Massey Ferguson tractors fitted with a 4-cylinder Sisu engine - Fit the following onto the engine flywheel: the vibration damper (11), with the face marked "engine side" or the offset (d) facing the engine flywheel (3). On its own, the vibration damper is almost centred in the engine flywheel due to the regrinding of its external diameter. Lightly smear the thread of the screws (7) with Loctite 270 or equivalent. Fit and tighten these screws to a torque of 110 - 130 Nm. Take off centring tool 3378712M1. If necessary, release the engine flywheel using the locally made tool.

Massey Ferguson tractors fitted with a 6-cylinder Sisu engine - Fit the following onto the engine flywheel: the vibration damper (11), with the face marked "flywheel side (CV)" or the offset (d) facing the engine flywheel (3). Lightly smear the thread of the screws (7) with Loctite 270 or equivalent. Fit and tighten these screws to a torque of 110 - 130 Nm. Tractors fitted with a 4-cylinder or 6-cylinder Sisu engine - Reconnect the tractor between the engine and the gearbox.



Removing and refitting the flywheel - Disconnect the tractor between the motor and the gearbox. Remove the vibration damper. Hold the flywheel in place with a mobile crane and a suitable sling. Immobilise the engine flywheel using a locally made tool, as in step 3. Unscrew two diametrically opposed screws (4) (Fig. 11) on the engine flywheel. Replace with two M12 guide studs. Unscrew the remaining screws (4). Move the flywheel aside. Remove the engine flywheel using the mobile crane and sling used earlier. If necessary: extract the flywheel bearing (10); unscrew the M12 guide studs.

Degrease the mating faces of the flywheel and crankshaft. Dry each face using a jet of compressed air. If removed, screw two diametrically opposed M12 guide studs into the crankshaft. Using the same tools as for removal, move the flywheel close to the motor, resting it against the crankshaft. For 74 ETA and 74 CTA type Sisu engines, position the circular plate (1) (Fig. 11). 66 ETA and 66 CTA type Sisu engines do not have a circular plate (Fig. 12). Tighten a few screws (4). Take out the guide studs.

Immobilise the flywheel as in step 3. Fit the remaining screws (4). Lightly smear the thread of all the screws (4) with Loctite 270 or equivalent. Tighten these screws to 140 Nm. Remove the sling. Release the flywheel. If the bearing (10) is defective, replace it with a new one. Refit the vibration damper.



Replacing the sealed bearing - Remove the vibration damper. Extract the sealed bearing (10) using a slide hammer puller. Discard it. The sealed bearing also supports the gearbox input shaft. Clean the sealed bearing cavity on the flywheel. Check inside the bearing housing for filings or knocks. Check that the inside cage of the sealed bearing (10) slides freely on end E of the gearbox input shaft (Fig. 14). Flush fit the new sealed bearing against the engine flywheel shoulder using a sleeve made locally to the following dimensions. For 4-cylinder engines - Inside D = 46.5 +0/-0.1 mm, Outside D = 50 +0.1/-0 mm, L=170mm). For 6-cylinder engines - Inside D = 55 +0/-0.1 mm, Outside D = 60 +0.1/-0 mm, L=170mm. Manually check the rotation of the sealed bearing after fitting. Refit the vibration damper.



Replacing the starter ring gear - Disconnect the Massey Ferguson tractor between the motor and the gearbox. Remove the vibration damper. Remove the flywheel. Position it flat on a workbench. Drill a hole 16 mm deep in the starter ring gear (2) using a 5 mm drill bit. Split the starter ring gear with a suitable chisel. Release it from the flywheel (3). Heat a new starter ring gear (2) to 245C. Heating must be carried out in an oven. Hold the flywheel flat on a workbench. Turn the teeth input of the starter ring gear (2) towards the starter drive gear. Fit the starter ring gear on the flywheel. Quickly push it up against the flywheel shoulder. Allow it to cool slowly. Refit the flywheel. Refit the vibration damper.

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