Watson-Marlow SPS - Manual (Page 56)

MasoSine SPS sinusoidal pumps User Manual 56
It is important to ensure that the shaft cannot rotate while the shaft nut is removed.
If the motor is fitted to the pump, its torque should be enough to secure the shaft.
If it is not secure, uncouple the pump from the motor and secure the shaft using a
tommy bar or a spanner handle between the spider castellations on the drive shaft.
Alternatively, a well-padded wrench can be used on the shaft and the key or keyway.
l Use the 32mm ring spanner supplied with the pump to remove the shaft nut
from the end of the shaft (right-hand thread).
l You can now access the rotor front O-ring (arrowed) in its groove in the rotor
front.
Removing the shaft nut
The shaft nut
SPS 200 pumps