17 / 23
Festo 7CRHDb_en
•
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.
4.4.3
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"
.
•
Push a cushioning boss onto the piston rod.
•
Apply screw locking agent (included in the set of wearing parts) all around
the piston rod on the chamfered end.
•
Reassemble the piston components in the correct sequence.
•
Push the complete piston into the correct position on the piston rod with
one rotation (to evenly distribute the screw locking agent).
•
Push the second cushioning boss onto the piston rod.
•
Apply the screw locking agent included in the set of wearing parts to
the inside of the threaded coupling and screw it onto the piston rod with
the corresponding torque (see table).
Type
Torque
CRHD-32
10 Nm
CRHD-40
20 Nm
CRHD-50
50 Nm
CRHD-63
50 Nm
CRHD-80
60 Nm
CRHD-100
60 Nm
