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...8 MAINTENANCE
Note.
• The bungs are designed to grip the pump tube when
compressed by the platen. Two sizes of tube are used
so it is essential that the correct size of bung is fitted.
• It is immaterial which tube passes over which pump
roller, but for neatnes the front tube should be de-
gassed sample, the centre tube reagent and the raw
sample tube to the rear.
7
Locate the tubes centrally on
the pump rollers.
5
Fit new pump tube bungs
and shims, from the kit, to
the left hand side of the
pump.
6
Pass the new pump tubes, from
the kit, through the tube bungs
and case grommets. Connect to
the appropriate tube connector
at the rear of the case.
28
Fig. 8.1 Maintaining the Peristaltic Pump
1
Remove the pump platen by
firmly sqeezing the pump platen
against the capstans until the
catch mechanism turns freely to
a vertical position. Pull the catch
forward to release the platen.
Push the pump platen on the pump
8
tubes until the catch mechanism locates
in the hole in the case and turn to the
horizontal position.
3
Remove the retaining screw on the pump
shaft and remove all of the capstans.
4
Fit the new capstan, from the kit, on
the hexagonal shaft so the rollers
are offset from one another. Re-fit
retaining screw.
2
Disconnect each pump tube from its respective tube
connector at the rear of the case; pull the tube out
of the grommets and discard.
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