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Watson-Marlow 620DuN and 620Du User Manual 105
33.5 620L and 620LG Tube loading
Double-Y elements for low-pulsation flow and dispensing
applications
See illustrations at 33.4 620L removal and installation. The track is secured to
the pumphead by cams positioned at its left and right. Where the cam shafts
are visible at the front of the pumphead, they are milled square to accept a
spanner. Use a 10mm or 3/8in AF spanner to rotate the right-hand cam shaft
through 180 degrees counter-clockwise, and the left-hand camshaft through
180 degrees clockwise. The position of the cam rotation stops indicate when
they are fully closed (third picture, left) and open (right). Lift off the track.
Locate one end of double-Y element over one of the 625L clamping pegs.
Stretch the element over the rotor and locate the other end of the element
over the second 625L clamping peg. Replace the track as described at 33.4
620L removal and installation.
Twin inlet tubes for best handling of viscous fluids
See illustrations at 33.4 620L removal and installation. The track is secured to
the pumphead by cams positioned at its left and right. Where the cam shafts
are visible at the front of the pumphead, they are milled square to accept a
spanner. Use a 10mm or 3/8in AF spanner to rotate the right-hand cam shaft
through 180 degrees counter-clockwise, and the left-hand camshaft through
180 degrees clockwise. The position of the cam rotation stops indicate when
they are fully closed (third picture, left) and open (right). Lift off the track.
Unscrew and remove the 625L inlet clamping peg. Connect the twin inlet tubes
and outlet tube using the appropriate Y-piece connector and clips. Fit the inlet
tubes into the correct size clamping block. Locate the Y-piece end of the ele-