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6 Operation and maintenance
930 Compact IC Flex Oven/SeS/PP (2.930.2500)
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77
2
Cleaning the parts of the piston cartridge
￭ If the zirconium oxide piston has become contaminated due to
abrasion or deposits, then clean it using a fine abrasive cleaning
powder, rinse it using ultrapure water until it is free of particles
and dry it.
The zirconium oxide piston must be replaced if it is heavily
contaminated or scratched.
￭ Rinse the other parts of the piston with ultrapure water and dry
with a lint-free cloth.
3
Replacing the zirconium oxide piston
￭ Remove the retaining washer (22-2) from the old piston. If the
retaining washer sits too tightly, use a pointed object to loosen
the retaining washer.
￭ Assemble the retaining washer at the same point on the new pis-
ton.
4
Putting the piston cartridge together
￭ Insert the inner plastic sleeve, the spring and the spring retainer
into the piston cartridge.
￭ Slide the zirconium oxide piston carefully into the piston cartridge
until its tip emerges from the small opening of the piston car-
tridge.
￭ Attach the screw and tighten it by hand.
Mounting the piston
1
Reinserting the backup ring
Clean the backup ring (18-3) wit ultrapure water and reinsert it.
2
Reinserting the piston cartridge
Screw the assembled piston cartridge back into the pump head and
tighten, first by hand, then also using an adjustable wrench by
approx. 15°.
Clean the second piston cartridge in the same way.
Mounting the pump head
Accessories
For this step, you need the following accessories:
You can find these parts in the accessory kit: Vario/Flex Basic
(6.5000.000).
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