Festo DZF - 4.4 DZH Cylinder Repair Procedures

17 / 24Festo 7DZF / DZHb_en
4.4 RepairingtheatcylinderDZH-…
The description in this section can be used to repair cylinders of the type DZH-… with the following features:
Code Description
PPV Pneumatic cushioning adjustable at both ends
A Position sensing
S2 Through piston rod
S6 Seals heat-resistant up to 120°C
S20 Through, hollow piston rod
4.4.1 Structure of the bearing cap (schematic representation)
1
2
4
5
3
1 Bearing cap
2 O-ring
3 Cushioning seal
4 Piston rod seal
5 Bearing
4.4.2 Removing the bearing and end caps
• Loosen the screws in the bearing and end caps (the rear bearing cap on
cylinders with through piston rod (S2 / S20)) and remove them.
• Pull the bearing and end caps away from the cylinder barrel and piston rod.
• Remove any residue of the screw locking agent from the threads of the
screws.
4.4.3 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.