9 - AHP Merkle GmbH

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Installing the guide rings
The installation of the guide rings varies depending on whether they are being installed as piston guides or
rod guides.
In the case of guide rings for the rod, the guide ring is placed in the corresponding groove and pressed in
lightly. It may be necessary to use a calibration gage to give it the right shape.
In the case of guide rings for the piston, the guide ring is rolled into a spiral (image 1 and 2) in order to give it
a pretension that is useful for installation. The guide ring can then be placed in the groove (image 3).
1 2 3
The ends of the guide rings should never be installed fl ush with the port holes.
Otherwise there is a danger of shearing off in the port holes.
In the case of two or more guide rings the ends of the guide rings should never
be lined up with each other.
The guide rings should be installed with the aid of suitable lubricants.
Because seal sets often contain more seals and guide rings than are needed,
all of the parts being exchanged should be checked again before assembly.
Assembling the cylinder
Before assembly, all seals and guides should be coated with a suitable lubricant or with the hydraulic fl uid
being used. When assembling the cylinder components, it must be ensured that they are assembled in
alignment with each other. Particular care should be taken during the entire assembly processes to ensure
that the seals are not damaged through the use of excessive force or by sharp edges.
Any damage to seal interfaces (e.g. wrench surfaces) have to be rounded or polished before assembly.
Damaged or defective hydraulic cylinders may no longer be used.
When maintenance work is completed, the hydraulic cylinder and the hydraulic system must be put into operation
using the proper procedure. Please see the procedure described under „Assembly and commissioning“.
4.3 Disposal
Used parts and any hydraulic fl uid that has been collected or discharged must be disposed of properly.