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Festo 7CRHDb_en
4.3.2
Removing the bearing and end caps
Warning
Use clamping protection to prevent damage to the surface of the cylinder
barrel and deformation of the cylinder barrel.
•
Clamp the cylinder barrel in a vice.
•
Push the piston rod fully into the cylinder.
Warning
Risk of burns from hot surfaces.
Wear suitable protective gloves.
The area near the cushioning screw
2
must not be heated.
•
Heat the thread section
3
between the bearing cap
1
and cylinder barrel
4
to between 160 °C and 170 °C.
1
3
2
4
•
Unscrew the bearing cap from the cylinder barrel using a threaded pin
(see chapter
7.2 "Special tools").
•
Pull the piston rod out of the cylinder barrel.
•
Remove the end cap as described above with the bearing cap.
Note
The surface of the cylinder barrel should be repolished if it has been
damaged.
•
Check the cylinder barrel and piston rod for damage.
The entire cylinder must be replaced if the cylinder barrel
(particularly the bearing surface) is showing significant damage.
•
Remove any residue of the screw locking agent from the thread of
the cylinder barrel.
4.3.3
Replacing the piston components
Note
The piston on the CRHD-32-… is the only piston size that consists of one
component, all others consist of five components.
•
Unscrew the threaded coupling from the piston rod.
•
Remove the piston components from the piston rod, noting the order and
orientation.
•
Remove any residues of the screw locking agent from the threads of
the piston rod and threaded coupling as well as the seat of the piston.
•
Clean the piston rod as described in chapter
5.1 "Cleaning"
.
