6.7 Servicing the high-pressure pump
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76
￭￭￭￭￭￭￭￭
930 Compact IC Flex Oven/SeS/PP (2.930.2500)
￭ The pump head has been removed (see "Removing the pump head",
page 71).
￭ The piston cartridge is removed (see "Replacing the piston seal", page
74).
For this task, you need the following accessories:
￭ Zirconium oxide piston (6.2824.070)
￭ Adjustable wrench (6.2621.000) from the accessory kit: Vario/Flex
Basic (6.5000.000).
1
Breaking down the piston cartridge
CAUTION
Inside the piston cartridge there is a taut spring that can launch
out of the piston cartridge if the tension is released suddenly.
When opening the piston cartridge, counteract the pressure from
the spring and carefully unscrew the cartridge.
￭ Loosen the piston cartridge's screw with an adjustable wrench
and carefully unscrew the screw by hand while counteracting the
pressure from the taut spring.
￭ Remove the zirconium oxide piston and place it on a paper towel.
￭ Remove the spring retainer, the spring and the inner plastic sleeve
from the piston cartridge and lay them next to the piston.
￭ Place the backup ring you put aside with the remaining parts.
Figure 22
Parts of the piston cartridge
1
Piston cartridge screw
2
Retaining washer
3
Zirconium oxide piston (6.2824.070)
4
Spring retainer
5
Spring (6.2824.060)
6
Inner plastic sleeve
Protects from metallic abrasion.
7
Piston cartridge
8
Backup ring
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