Vespa Primavera 50 - Service manual > Drive-belt

• Make sure the drive belt is not damaged and does not show signs of abnormal wear.
• Replace according to the scheduled maintenance table.

Removing the driving pulley

• Using specific tools, lock the driving pulley and loosen the nut.

Specific tooling

020938Y Driving pulley check ring

• Remove the flat washer and the cup washer.

• Remove the stationary half-pulley and the washer.

• Disengage the belt.
• Remove the complete roller housing.

Inspecting the rollers case

• Check that the internal bushing shown in the figure is not abnormally worn and measure inner diameter A.
• Measure outer diameter B of the pulley sliding bushing shown in the figure.
• Check that the rollers are not damaged or worn.
• Check the guide shoes for the variator back-plate are not worn.
• Check the wear of the roller housings and of the belt faying surfaces on both pulley halves.
• Check that stationary driving pulley does not show signs of abnormal wear on the grooved edge and on the surface in contact with the belt.

CAUTION

DO NOT LUBRICATE OR CLEAN SINTERED BUSHINGS

Characteristic

Movable driving half-pulley bushing:
Ø30 (+0.081 +0.060) mm

Sliding bushing:
Ø26 (-0.020 -0.041)mm

Characteristic

CVT rollers ø 19 mm
Wear limit ø 18.4 mm

Refitting the driving pulley

• Perform the operations in reverse order of disassembly.

CAUTION

INSERT THE ROLLERS WITH THE LARGEST SUPPORT SURFACE ACCORDING TO THE DIRECTION OF ROTATION.

• Tighten the torque using the specific tool to lock the pulley.

CAUTION

DURING THE INSTALLATION PAY SPECIAL ATTENTION TO THE ASSEMBLY OF THE BELLEVILLE SPRING, AS SHOWN IN FIGURE.

Specific tooling

020938Y Driving pulley check ring

Locking torques (N*m)
Driving pulley retainer nut 75 to 83

Refitting the transmission cover

Follow the removal steps but in reverse order; be careful to tighten to the prescribed torques.

Locking torques (N*m)
Clutch cover retainer screws 10.8 to 12.8

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