Vespa Primavera 50 - Service manual > End gear

Removing the hub cover

• Use a container large enough to recover the final reduction oil. Unscrew the indicated screw and recover the aluminium seal.
• Unscrew the oil filler screw in order to facilitate bleeding.

Recommended products
AGIP GEAR SAE 80W-90 Lubricant for gearboxes and transmissions.

API GL-4

Characteristic

Hub oil
200 cm³

• Remove the brake shoe.
• Unscrew the eight hub cap fixing screws.

• Remove the final reduction cap complete with the wheel axle, being careful not to drop the intermediate gear.

Removing the wheel axle

• Remove the intermediate gear.
• Remove the wheel axle.

Removing the hub bearings

Removing the clutch shaft bearing

• Remove the Seeger ring.
• Remove the oil seal from the opposite side.
• Remove the bearing working from the external side and using the specific tools.

Specific tooling

020376Y Adapter handle
020363Y 20 mm guide
020359Y 42 x 47-mm adaptor

Removing the intermediate gear bearing

• Remove the bearing using the specific tools.

Specific tooling

001467Y009 Bell for OD 42-mm bearings
001467Y013 Calliper to extract 15-mm diameter bearings

Removing the wheel axle bearing

• Remove the bearing using the specific tools.

Specific tooling

001467Y009 Bell for OD 42-mm bearings
001467Y013 Calliper to extract 15-mm diameter bearings

Removing the wheel axle bearings

• Support the hub cover properly to avoid damaging the sealing surface with the crankcase
• Remove the Seeger ring from the outside.
• Operating on the inside, remove the oil seal.
• Remove the wheel axle bearing using the specific tool.

Specific tooling

020376Y Adapter handle
020364Y 25-mm Guide
020359Y 42 x 47-mm adaptor

Removing the intermediate gear bearing

• Remove the bearing using the specific tools.

Specific tooling

001467Y013 Calliper to extract 15-mm diameter bearings
001467Y009 Bell for OD 42-mm bearings

Inspecting the hub shaft

• Check the three shafts and the intermediate gear for wear or distortion of the toothed surfaces, the bearing housings, and the oil seal housings.
• If faults are found, replace the damaged parts.

Characteristic

Driven pulley shaft
A: 22(-0.01 -0.02)mm

Wheel axle
B: 15(-0.010 -0.020)mm
C: 25(-0.007 -0.020)mm

Intermediate gear

D: 15(-0.01 -0.02)mm
E: 15(-0.01 -0.02)mm

Inspecting the hub cover

• Check that the coupling surfaces are not dented or distorted.
• Check the bearing bearings.
• In case of faults, replace the damaged parts.

Refitting the driven pulley shaft bearing

• Use the heat gun to heat the bearing seat.
• Set a new bearing using the specific equipment .
• Insert a locking seeger.

Specific tooling

020151Y Air heater
020376Y Adapter handle
020360Y 52 x 55-mm adaptor
020363Y 20 mm guide

Fitting the transmission shaft bearing

• Use the heat gun to heat the bearing seat.
• Set a new bearing using the specific equipment .

Specific tooling

020151Y Air heater
020376Y Adapter handle
020359Y 42 x 47 mm Adaptor - For main bearings and wheel axle
020412Y 15 mm guide

Fitting the wheel axle bearing

• Use the heat gun to heat the bearing seat.
• Set a new bearing using the specific equipment .

Specific tooling

020151Y Air heater
020376Y Adapter handle
020359Y 42 x 47 mm Adaptor - For main bearings and wheel axle
020412Y 15 mm guide

Refitting the hub cover bearings

Fitting the wheel axle bearing

• Use the heat gun to heat the bearing seat.
• Plant a new bearing using the equipment, apply grease on the adapter and guide in order to maintain the position of the bearing during operation on the vertical axis.
• Insert the Seeger ring.

Specific tooling

020151Y Air heater
020376Y Adapter handle
020360Y 52 x 55-mm adaptor
020364Y 25-mm Guide

Fitting the transmission gear bearing

• Use the heat gun to heat the bearing seat.
• Using the equipment set a new bearing.

Specific tooling

020151Y Air heater
020376Y Adapter handle
020359Y 42 x 47-mm adaptor
020412Y 15 mm guide

Refitting the hub bearings

• Insert the gears in the cover in order to prevent abnormal movements during insertion into the engine.
• Insert the wheel axis.

Refitting the hub cover

• Clean the engine crankcase and reduction cover surfaces adequately.
• Working in reverse with respect to the disassembly, inert the command pinion and the intermediate gear into the hub box.
• Pay attention to the correct positioning of the alignment dowels.
• Insert the gasket.

• Insert the gears of the reduction unit in the reduction cover and tighten the screws to the specified torque, tightening in crossed sequence.
• Check the correct the tightening drainage screw.

Locking torques (N*m)
Hub cover fixing screws 23.53 to 26.48 Reduction unit oil drainage screw 15 to 17

• Restore the level of oil inside duction unit with the recommended product, acting on the filler screw until touching.
• Tighten to the specified torque.

Recommended products
AGIP GEAR SAE 80W-90 Lubricant for gearboxes and transmissions.

API GL-4

Characteristic

Hub oil
200 cm³

Locking torques (N*m)
Oil relief screw 15 to 17

See also: