Watson-Marlow 504S - Manual (Page 6)

6
Roller adjustment
The 501RL has a factory set gap of 2.6mm between the rollers and the track and is suitable for tubing having wall thicknesses of
between 1.6 and 2.0mm. Adjustment of the gap will be required if tubing having a wall thickness of less than 1.6mm is required.
There is an adjusting screw on each of the two roller arms, and each of these screws will require adjustment. The correct gap is
twice the wall thickness less twenty percent. Correct adjustment is important: over occlusion will reduce tube life; under
occlusion will reduce pumping efficiency.
To change the gap setting, turn each adjusting screw clockwise to increase the gap, or anticlockwise to decrease the gap. A full
turn changes the gap by 0.8mm.To restore the original settings of 2.6mm, turn the adjusting screws until both rollers are just
touching the track, then tighten each screw by three and a quarter turns. The 501RL2 has a factory set gap of 3.8mm between
the wall and the track and is suitable for tubing having wall thickness of between 2.1 and 2.5mm.
Check moving parts of the rotor from time to time for freedom of movement. Lubricate pivot points and rollers occasionally with
Teflon lubricating oil.
Specific drive performance details such as loaded drive speed variation against mains supply voltage fluctuation and drive
stability from a cold start to normal operating temperature are available on request. For further information please contact
Watson-Marlow Technical Support Centre.
Pumphead spares
Number Spare Description
1 MN 1200M Lockable guard
2 FN 4502 Lock
3 FN 2341 Hinge screw
4 MN 0266M Hinge grey
5 MNA0623A Tube clamp assembly
6 FN 2332 Screw
7 MN 0011T Main roller
8 MNA0143A 501RL Rotor Assembly
9 SG0001/SG0002 Springs standard/hard
10 MN 0012T Follower roller
XX 0095 Teflon lubricant