Festo CRDSNU Series, Repair Instructions, Page: 15 / 18

15 / 18 Festo 7CRDSNUb_en
4.8.3 Assembling the new sealing seat
Note
It is recommended to replace the O-ring between the sealing seat and
cylinder body with a new one when replacing the sealing seat
(
spareparts.festo.com ).
• Grease the new O-ring and insert it into the groove of the sealing seat
(both sealing seats on cylinders with through piston rod (S2 )).
• To protect the bearing and seals, place the appropriate mounting sleeve
(see chapter
7.2 "Special tools" ) on the thread of the piston rod to prevent
damage.
• Guide the bearing cap (both bearing caps on cylinders with through piston
rod (S2)) over the mounting sleeve onto the piston rod as far as the cylinder
barrel.
• Screw the sealing seat into the bearing cap (both bearing caps on cylinders
with through piston rod (S2)) and tighten it to the corresponding torque
(see table).
Type Torque
Standard cylinder
CRDSNU-12 18 Nm
CRDSNU-16 18 Nm
CRDSNU-20 45 Nm
CRDSNU-25 45 Nm
Round cylinder
CRDSNU-32 50 Nm
CRDSNU-40 70 Nm
CRDSNU-50 85 Nm
CRDSNU-63 85 Nm
• Perform a functional test as per the operating instructions (enclosed with
the cylinder or can be called up on the Festo website (
www.Festo.com )) and
commission the repaired cylinder.