9 - AHP Merkle GmbH

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Tip
Once all of the preparatory work has been completed, the cylinder can be opened and the piston rod can be
removed. This is best done from the rod end.
The removed parts should fi rst be cleaned and then checked for damage such as scoring, scratches and the
like. Cleaning should be performed using only lint-free cloths and suitable cleaning agents.
Even the smallest scratches and scoring cause damage to the seals, and lead to
premature wear on the seals. More heavily damaged parts must be replaced.
In the case of normal signs of wear, maintenance at certain intervals is a necessary
effort. In cases of premature damage, it is essential to fi nd the cause so that the new
seal can achieve a longer service life.
Removing seals
When removing the seals, be sure not to use sharp or hard tools. Improper removal can cause damage to the
cylinder surfaces (edges, base of groove) that can later compromise the function of the seal and the hydraulic
cylinder. The use of a rounded, polished screwdriver is recommended for proper removal of seals.
After the seals have been removed, clean everything carefully and prepare the new seals for installation.
The installation spaces must be free of dirt and sharp edges.
When installing the new seals, ensure that they are installed in the right location
and with the right orientation.
When installing rod seals it is necessary to work especially carefully and cautiously, because the recesses for
the various seal types and seal sizes often appear very similar. As a fundamental rule, it is advisable to install
new seal as soon as possible after the old seals are removed. Comparing the new seals to the old ones helps
in fi nding the correct allocation.
AHP Merkle can also provide information about the correct arrangement.
It has also proven very useful to use a digital camera to take a picture of the seal
arrangement before removal, and possibly also pictures of other machine elements,
so as to be able to verify them once assembly is complete.
Operating and maintenance instructions en
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