VESPA GTV 250 i.e. 2008 Service Station Manual page 98

Engine
Inspecting the driven sliding half-pulley
- Remove the two seal rings and the two O-rings
- Measure the movable half-pulley bushing inside
diameter.
- Check the contact surface with the belt to make
sure there are no flaws.
- Check the riveted joints are functional.
- Check the evenness of the belt contact surface.
MOVABLE DRIVEN HALF-PULLEY DIMENSIONS
Specification
Wear limit
standard diameter
maximum allowable diameter
Refitting the driven half-pulley bearing
- Support the pulley bushing adequately from the
threaded side using a wooden surface.
- Fit a new roller bearing as shown in the figure.
- For the fitting of the new ball bearing, follow the
example in the figure using a modular punch.
Fit the retainer ring
WARNING
N.B.
FIT THE BALL BEARING WITH THE VISIBLE SHIELDING
Specific tooling
020376Y Adaptor handle
020375Y 28 x 30 mm adaptor
020424Y Driven pulley roller casing fitting
punch
ENG - 98
Vespa GTV 250 i.e.
Desc./Quantity
0.3 mm
Ø 41.000 - 41.035 mm
Ø 41.08 mm