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Festo 7DGE_25-63_ZR_KFb_en
• Pull the guiding bands away from the piston.
• Pull the band guides away from the piston.
4.2
Linear recirculating ball bearing guide system (DGE-…-KF only)
The linear recirculating ball bearing guide system comprises a guide rail and the associated double row of recirculating ball
bearing units (roller bearing cartridges). The system has negative operating clearance in all sizes, i.e. it is pretensioned and
therefore has no mechanical play. This results in high rigidity and load bearing capacity in all system directions, as well as
more precise guiding.
The pretension must be manually adjusted.
Note
It is recommended to replace both machine components (guide rail and roller bearing components) of the linear guide
system. A defective machine component will always have a negative influence on the replaced component during
subsequent operation.
Removal and installation of the guide system can be necessary under the following circumstances, for example:
The end of its useful life has been reached as a result of material fatigue and wear. Signs of fatigue appear on the material
areas of the rolling components. Fine tears, pores and pits (depending on the wear condition) as well as deformation
occur. Pitting on the bearing surface of the guide rail can be observed visually as the bearing surface is noticeably un-
even. This can result in perceptible bearing clearance, impaired roll-off and increased operating noise, etc.
Note
The application must be checked for the following causes in the event of premature failure due to increased wear:
• Lack of lubrication; lubrication interval not adhered to (unlubricated operation).
• Use of a lubricating grease not contained in the specification.
• Dirty and corrosive ambient conditions (dust, etc.).
• Impact and vibration.
• Technical limit data exceeded (torques, forces, speed, temperature range, etc.).
Displacement force of the slide with the piston disconnected
The setting of the roller bearing guide can be assessed using the displacement force of the slide with the piston discon-
nected (see page 21 for the displacement force). This can only be done during assembly as connecting the piston and
toothed belt significantly increases the displacement resistance.
In addition to the subjective assessment of the operating behaviour and guide backlash, this method can also be used to
confirm the correct assembly and pretensioning of the roller bearing cartridges.
Follow the steps below to repair the linear recirculating ball bearing guide system:
• Remove the guide rail (see section
• Replace the roller bearing cartridges (see section
).
• Install the guide rail with slide (see section
Summary of Contents for DGE-25 ZR RF Series
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