Reassemble Pump Head
The following steps should be carried out on a clean, dry surface.
1. Push the two halves of the pump head (rinsing and pumping chambers) together with a
slight twisting motion.
2. Turn the rinsing chamber relative to the pumping chamber, until holes for the pump head
retaining screws are aligned (because of the asymmetry of the holes there is only one
correct position).
3. Check that the marks on the rinsing and pumping chambers are aligned.
4. Refit the bellows to a clean piston and insert the assembly fully into the rinsing chamber.
Cotter
Pin
Alignment
Marks
Figure 48
Correct Alignment of Chambers and Pistons
Figure 49
Correctly Seated Piston Assembly
5. Turn the piston until the small cotter-pin at the rounded end of the piston is in line
(approximately) with the alignment marks on the pump head.
6. Refit the white cap, reinsert the screws, and progressively tighten them, making sure that
the alignment marks are still correctly aligned (do not overtighten the screws).
Figure 50
Refitting the White Cap
Figure 51
Tightening the Screws
Do not turn the piston after the head is reassembled, because it is possible to damage the
bellows.
48
MAINTENANCE | 333/334 HPLC PUMPS
REASSEMBLE PUMP HEAD
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