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Technical Handbook
Hydraulic Cylinders
Service
9279 02-09
Publ. Gr. S.
970
The compressible piston rod seal
consists of a solid rubber
profile and gives a greater sealing area than V seals.
Use a screwdriver to remove the seal, see illustration. Lever out
and twist up the seal. With this type of seal where the sealing
area covers such a large part of the sealing groove, it is vitally im-
portant that the screwdriver is not allowed to make any mark.
Support ring and O ring
The support ring and O ring combination is used to seal between
two static surfaces, such as, for example, between the cylinder
pipe and the cylinder head, even in those cases where the cylin-
der head is threaded onto the cylinder pipe.
The task of the support ring is to brace the O ring so that it does
not change shape. The O ring is pressed against the support ring
and the sealing surface by the hydraulic pressure in the cylinder.
When the cylinder head is to be fitted into the pipe: Be extremely
careful so as not to damage the O ring.
KL1010
2
1
3
3
4
5
5
6
1. Hydraulic pressure
2. Sealing lip pressed out against piston rod
3. Sealing lip pressed in against cylinder head
4. Sealing surface, piston rod
5. Sealing surface, cylinder head
6. Screwdriver
KL1011
1
4
3
2
1. Hydraulic pressure
2. O ring
3. Support ring
4. Sealing area, cylinder head
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