4.6 Servicing the high-pressure pump
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
70
￭￭￭￭￭￭￭￭
883 Basic IC plus
￭ 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 23
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
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 con-
taminated or scratched.
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