Watson Marlow Pumps 604U, Manual, Page: 9 / 13

9
Tube loading
Isolate drive from the mains supply. If the pump is not switched off before the pumphead guard
is raised, a switch on the guard will cut off power to the motor. This switched guard is a safety
back-up system and must not be used as the primary on/off switch for the pump.
Open the pumphead guard and fit one end of the tube into the bottom adjustable clamp. Tighten the lower serrated
adjustment wheel. Whilst rotating the rotor clockwise (a spanner is provided for this purpose), feed the tube between
the rollers and the track, aligning it with the rotor tube guides. The tubing must lie naturally against the track and must
not be twisted or stretched.
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Pump shown in tube loading pictures is the 603S/R
Fit the other end of the tube into the top adjustable clamp, ensuring that the tube is not slack in the pumphead since
this can reduce tube life. Clamp the tube very firmly by turning the upper serrated adjustment wheel. Remove the
spanner and close the guard.
Roller adjustment
Should it ever appear that the roller arms are not equally adjusted, the original factory setting of 5.2mm can easily be
restored. Turn the adjustment screws on each roller arm anticlockwise until both rollers are just in contact with the
track, and then turn each screw clockwise by five turns. Correct adjustment is important. For 4mm wall thickness
tubing turn the screw clockwise by six and a half turns giving a roller/track clearance of 6.6mm.
Over-occlusion will reduce tube life. Under-occlusion will reduce pumping efficiency.
Check moving parts of the rotor from time to time for freedom of movement. Lubricate pivot points and rollers
occasionally with a light machine oil. For scheduled maintenance, remove the rotor from the pumphead, clean
thoroughly and apply Teflon lubricating oil to the roller spindles.