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Watson-Marlow 620DuN and 620Du User Manual 104
To remove the 620L pumphead
To remove the pumphead you must first remove the track. 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 the 10mm or 3/8in AF spanner provided 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.
The pumphead is secured to the black adaptor plate by two M6 screws. Use a
5mm Allen key to remove them. Lift off the pumphead.
It is not normally necessary to remove the adaptor plate. However, if it must be
removed for cleaning:
The adaptor plate is secured to the drive by four M6 screws. Use a suitable
screwdriver to remove them. Lift off the adapter plate. After cleaning, reposi-
tion and secure it in the same way.
To install the 620L pumphead
Clean and grease the projecting dog of the drive shaft. Position the cleaned
pumphead so that it engages with the drive-shaft dog. Use two M6 screws to
secure the pumphead to the adaptor plate.
Reverse the directions above to reposition the track.