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Festo 7CRHDb_en
5
Cleaning and greasing
5.1
Cleaning
The seals are designed so that the lubricant film applied to them will be effective for the service life of the seal.
The cylinder must be thoroughly cleaned of all foreign particles, machining residues and old lubricants before it is
greased to ensure that this "life-time lubrication" is retained.
Warning
Festo recommends Loctite 7063 and Loctite 7070 for cleaning.
When using other cleaning agents, make sure that they do not corrode the seals of the cylinder with piston rod.
In case of doubt, check the resistance of the seals using the data on the Festo website (
www.Festo.com
).
5.2
Greasing
The various components and seals of the cylinder with piston rod require different levels of greasing depending on
a number of factors.
Warning
To guarantee the life-time lubrication, the piston rod with assembled piston and piston seals must be moved a number
of times across the entire stroke of the cylinder barrel to produce an even lubricant film.
5.2.1
Extremely thin grease film
A barely continuous film of grease covers the bearing surface. The grease can give a sheen to the surface; however,
the colour of the grease must not darken it.
Recommendation:
Apply the grease using a cloth or similar dipped in the grease.
Remove the excess grease from the seal system components (e.g. by drawing the assembled piston with the piston rod
once fully through the greased cylinder barrel) and then remove the excess from the seal components by wiping it off.
5.2.2
Thin grease film
A film of grease covers the bearing surface so that the grease colour darkens the surface slightly.
Recommendation:
Apply the grease with a soft brush or similar.
5.2.3
Grease reservoir
There is a certain amount of oil enclosed between two sealing rims or in enclosed ring volumes.
6
Maintenance and care
Clean any dirt from the piston rod using a soft cloth.
All non-abrasive cleaning agents are permissible. In addition, the cylinders are maintenance-free as they have been
lubricated for life. Regular removal of the lubricant on the surface of the piston rod reduces its service life.
