Watson-Marlow 701S/R - Manual (Page 7)

Part 3: Maintenance
Fitting a second pumphead
701S/R pump may be fitted with one 701RX extension pumphead to give two
channels of flow. There is no restriction on the size of tube which can be used
in each pumphead when two pumpheads are fitted, but if two tubes of
25.4mm bore are fitted, the maximum output pressure against which the
pump can operate is 1.5 bar (22 psig).
Tubing
considerations
1. Remove the plug from the slot in the centre shaft of the first pumphead,
and remove the plug from the tapped hole on the top right hand corner of
the first pumphead.
2. Remove the track securing bolt and the track from the first pumphead.
Remove the M8 x 16 socket head cap screw from the bottom left (just
above the left hand foot) of the first pumphead.
3. Remove the track securing bolt and the track from the extension
pumphead.
Grease the drive shaft tongue of the extension pumphead with the grease
supplied. Turn the centre shaft of the extension pumphead until its drive shaft
tongue is aligned with the slot in the drive shaft of the first pumphead.
Important
Apply thread locking compound to the M8 x 16 socket head cap screw in the
top right hand corner of the backplate of the extension pumphead. Fit the
701RX extension pumphead to the first pumphead, ensuring that the
backplate of the extension pumphead is flat against the frontplate of the first
pumphead.
4. Tighten the socket head cap screw in the top right hand corner of the
extension pumphead with the modified Allen key supplied.
5. Apply thread locking compound to the M8 x 170 socket head cap screw in
the bottom left of the extension pumphead frontplate, and tighten it with
the Allen key supplied.
Follow the tube loading instructions in the next section for each pumphead,
using the double length bolt to secure both tracks.
6. Tighten the track securing bolt with the Allen key provided to prevent
removal by hand.
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