PIAGGIO 500 cc Service Manual page 225

Lubrication
Checking the oil pump
- Remove the two screws and the oil pump cover.
- Remove the internal rotor retaining ring turning it so
that the opening is in correspondence with the shaft
facing.
- Remove the rotors and clean them accurately with
petrol and compressed air.
- Pull out the shaft complete with drive wheel to check
its condition and any signs of wear the shaft itself.
- Reassemble the rotors on the pump casing keeping
the 2 references in sight.
- Insert the shaft and drive wheel and assemble the
retaining ring and rotate it with the opening on the
opposite side of the shaft facing.
- Check any anomalous plays between the shaft and
pump casing.
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