Festo DNCB - Repair Steps - Disassembly; Removing Bearing and End Caps; Replacing Piston Components

11 / 17Festo 7DNCBa_en
4.3.2 Removing the bearing and end caps
• Loosen the screws in the bearing cap and end cap and remove them.
• Remove the bearing and end caps from the cylinder barrel and piston rod.
4.3.3 Replacing the piston components
• Pull the piston rod out of the cylinder barrel.
• 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 signicant damage.
• Unscrew the threaded coupling from the piston rod.
• Remove the piston components from the piston rod, noting the sequence
and alignment.
• Remove any residue of the screw locking agent from the threads of the
piston rod and threaded coupling.
• Replace the components with those from the wearing parts kit and reassem-
ble the piston components on the piston rod in the correct sequence.
• Apply the screw locking agent contained in the wearing parts kit to the
inside of the threaded coupling and screw it onto the piston rod with the
corresponding torque (see table).
Type Torque
DNCB-32 10 Nm
DNCB-40 20 Nm
DNCB-50 30 Nm
DNCB-63 40 Nm
DNCB-80 60 Nm
DNCB-100 60 Nm