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Watson-Marlow 620DuN and 620Du User Manual 92
Ensure the roller pin is correctly seated into the roller arm thrust washer.
Replace the circlip.
Rotor removal
Remove the rotor cover by hand and the central locating bolt using a 5mm
Allen key. Pull the rotor off the keyed shaft. Do not use tools to lever the rear
face of the rotor away from the inner face of the track: it should come off by
hand.
Track removal
Remove the rotor as described above.
Disconnect the waste pipework (if attached).
Loosen the two track retaining screws using a suitable screwdriver.
Withdraw the track fully from the gearbox.
After removing the rotor and track, it is advisable to remove the metal key
from the keyway, clean and reassamble. The key fits its keyway tightly. It may
be freed by tapping gently with a screwdriver or other suitable tool.