Watson-Marlow 520Du - Manual (Page 84)

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 84
Rotor removal
Remove any tubing from the pumphead.
Open the flexible rotor cap in the centre of the rotor.
Undo and withdraw the central locating screw using a slotted screwdriver.
Pull the rotor hub off its dogged shaft.
Between the hub and the shaft is a split collet. If the collet is retained by the
shaft, pull it off, loosening it if necessary by tapping it lightly. Avoid levering it
off using a screwdriver or other tool. If the collet is retained within the hub,
remove it, loosening it if necessary by reinserting the central locating screw a
turn or two and tapping the screw head lightly.
Rotor replacement
Re-locate the split collet onto the drive shaft, rotating it until it fully engages
the dog. Fit the rotor body over the drive shaft.
Open the flexible rotor cap in the centre of the rotor. Use a slotted screwdriver
to tighten the central locating screw to a torque of 3Nm (2.2 lb-ft) to prevent
collet slip during operation. When fitted correctly, the tube guide rollers should
align with the outer face of the track. Close the flexible rotor cap.
Close the guard and ensure that the rotor is clear of the guard by observing
the first few rotor rotations.