Festo DNCB - Repair Steps - Reassembly; Inserting Piston Rod into Barrel

12 / 17 Festo 7DNCBa_en
4.3.4 Inserting the piston rod into the cylinder barrel
• Clean the inner surface of the cylinder barrel as described in section
5.1 “Cleaning”.
• Apply the grease contained in the wearing parts kit to the following parts:
Component Other cylinders
Inner surface of cylinder barrel Thin lm
1)
Surface of piston rod Thin lm
1)
Piston washer Thin lm
1)
on outside
Piston surface between lips (grease reservoir
2)
) Fill 2/3 with grease
Cushioning boss Thin lm
1)
on outside
1)
See section 5.2.2 “Thin grease lm”
2)
See section 5.2.3 “Grease reservoir”
• Place the piston at on the front side of the cylinder barrel and insert the lip
ring of the piston into the cylinder barrel by tilting and turning it slightly.
The sealing lip must not fold back against the inside of the piston.
Note
If necessary use a at and blunt-edged object to insert the lip ring into the
cylinder barrel.
• Insert the piston fully into the cylinder barrel.
• Push the piston far enough into the cylinder barrel so that the rst lip ring
protrudes slightly at the other end of the cylinder barrel.
• Pull the piston rod back again until the piston is sitting fully in the cylinder
barrel.
Note
This approach ensures that the sealing lips of the two lip rings sit correctly in
the cylinder barrel.