Specifications, Service and Repair of Farm and Lawn Tractors

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Perkins 1006 Engine - Flywheel and damper (MF 8100/8200)

The damper (3) installed on the flywheel is secured by splines onto main shaft (6). It provides a flexible connection between the Perkins 6-cylinder engine and gearbox and damps any vibrations caused by the transmission. It is installed on MF 8110, 8120, 8130, 8210, 8220 tractors fitted with the Powershift AG150 (Fig1) Powershift Gearbox AG250 (Fig2) and Heavy gearboxes (fig3).

AG 150 - AG250 versions (Fig.1-2) - Bearing (1) fit in the flywheel is sealed on both faces. The seal is to give better reliability. The bearing supports main shaft (6) and does not itself rotate. Its position in the flywheel remains variable depending on the type of gearbox and the motor type. It may be bearing on a shoulder of the flywheel, or on a circlip. Spring (5) maintains the main shaft in position. The damper, the main shaft and the bearing form an assembly rotating at the speed of the flywheel.

Heavy Duty version (Fig.3) - The principle of installation and operation remain similar. Note, however, that: the spring is excluded, since the main shaft installation differs from that shown for the previous version; the bearing has one position only, and is in contact with the shoulder of the flywheel. The part number of damper (3) differs according to the version.

Split the MF 8100/8200 tractor between the engine and the gearbox. Remove screws (4). Remove damper (3). Check the parts and replace any that are faulty.

If the operation consists in changing the damper, also replace the bearing.

Lightly coat the splines of the damper hub with GN grease + Molycote. Refit and centre the damper, the offset on the hub pointing towards the gearbox (Figs. 1 - 2). Lightly coat the threads of screws (4) with Loctite 270 and torque to following values/ Powershift gearbox (AG150-AG250): M10 screws: 68 - 92 Nm. Heavy gearbox: M12 screws: 102 - 138 Nm. Reassemble the tractor between the Perkins 1006 engine and gearbox.

Powershift gearbox AG150



Parts list - (1) Bearing (2) Starter ring gear (3) Damper (4) Screw (5) Spring (6) Main shaft (7) Gearbox A - 86 mm B - 107,95 mm

Powershift gearbox AG250



Parts list - (1) Bearing (2) Starter ring gear (3) Damper (4) Screw (5) Spring (6) Main shaft (7) Gearbox (8) Circlip A - 86 mm B - 94 mm

Heavy gearbox





Parts list - (1) Bearing (2) Starter ring gear (3) Damper (4) Screw (5) Spring (6) Main shaft (7) Gearbox A - 86 mm B - 107,95 mm

Split the MF 8110, 8120, 8130, 8210, 8220 tractor between the engine and the gearbox. Lock the flywheel using a suitable fixture. Remove the damper. Remove the flywheel. Drive out bearing (1) (Figs. 1-2).

- On certain types of installation (Figs. 1 - 2) , extraction of the bearing is possible without removing the flywheel, using a slide hammer.
- If installing a type A flywheel and a Powershift gearbox AG250, replace circlips (8) and the bearing (Fig. 1)

Refitting

Check the parts, replacing any that are defective. Screw two guide studs opposite one another into the holes used for attaching the flywheel on the crankshaft. Refit the flywheel.

Depending on the type of fixture, fit bearing (1) before or after refitting the flywheel, using a suitable mandrel (dia. 62 mm, corresponding to the hole in the external cage of the bearing).

Remove the guide studs. Torque the screws to 140 Nm. For the screw torquing values on Valmet flywheels, refer to the engine repair manual. Refit the damper. Reassemble the tractor between the 1006 Perkins motor and gearbox.

Replacing the starter ring gear

Split the tractor between the engine and gearbox. Remove the damper. Remove the flywheel. Using a suitable-strength drill bit, drill a hole (D=5) to the same depth as the width of ring gear (2) to avoid touching the flywheel. Use a suitable cold chisel to split the ring gear (Fig. 3). When breaking the ring gear, provide some protection to stop splinters of material.

Heat a new ring gear to 245C in a furnace only. Install ring gear (2) on the flywheel, with the teeth opening pointing towards the starter, and fit rapidly into abutment. Allow to cool slowly. Refit the flywheel and the damper. Reassemble the tractor between the engine and gearbox.

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