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Repairs
12.1.5 Piston disassembly
(see Figure 12-3 and Figure 12-6)
Figure 12-6:
Disassembling the piston
Clamp the housing (29) in a vice or similar device.
Turn the shaft (30) until the pistons (25) are accessible.
WARNING
Danger of injury due to incorrect disassembly!
Do not use compressed air to remove the pistons from the hous-
ing (projectile impact).
Remove the piston bearings (16) carefully using a screwdriv-
er.
Remove the piston bearing (5) and piston bearings (15).
Replace the end cap seal (14) when replacing spare parts.
12.1.6 Shaft disassembly
(see Figure 12-3 and Figure 12-7)
Figure 12-7:
Disassembling the shaft
Use pliers for circlips to carefully remove the spring clip (18).
Remove the thrust bearing (8) and thrust washer (10).
Push down with light pressure on the top of the shaft (30) un-
til it is possible to remove the cam (1) and the internal thrust
bearing (8).
Pull the shaft (30) completely out of the housing.
12-4
Tip
If the shaft cannot be removed by hand, gently tap the top of the
shaft with a plastic mallet to drive it out.
Remove the top and bottom shaft bearings (6 and 7).
Remove the top and bottom seals (20 and 21).
Replace the bearing bushings (6 and 7), internal and exter-
nal thrust bearing (8), as well as the seals (20 and 21) when
replacing the spare parts.
Info
Thoroughly clean all disassembled and non-replaced parts and
check for wear prior to assembly.
Assemble the actuator as described in Chapter "3.1.4 Rotary
actuator assembly".
12.2 Additional repairs
In the case of additional major damage, it is recommended
to have repairs performed by PFEIFFER.
12.3 Sending devices to PFEIFFER
Defective actuators can be sent to PFEIFFER for repair.
Proceed as follows to send devices:
Include the following information for returns:
− Actuator type
− Size
− Number of springs
− Fail-safe position
− Supply air
− Number of actuations (year, month, week or day)
− VDI/VDE bracket
Tip
PFEIFFER recommends documenting the following contamination
data in the form FM 8.7-6 "Declaration regarding the contami-
nation of PFEIFFER valves and components".
EB 31a_EN
December 2022 edition
Subject to technical changes
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