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Specifications subject to change without notice
Edition: August 2017
Maintenance EB 31a-01_EN
6.2.2
Actuator reassembly after replacement of parts
•
Mounting the actuator shaft and bearing bushings
(see Fig. 40, Fig. 41, Fig. 42, and Fig. 43)
◦ Apply grease to the shaft as shown in Fig. 40.
◦ Push the top bearing bushing ( 6 ) onto the shaft ( 4 ).
◦ Apply grease to the surface of the bearing bushing
( 7 ) and the shaft ( 4 ) as shown in Fig. 41.
◦ Apply grease to the surface of the bearing bushing
( 7 ) and mount the bushing as shown in Fig. 42.
◦ Use the special tool (available from Pfeiffer) to hold
the bearing bushing ( 7 ) stationary while pressing in
the shaft ( 4 ).
We recommend clamping the tool into a vise as shown
in Fig. 43.
After mounting the shaft, place the thrust washer ( 19 )
on the top shaft end. Mount the spring clip ( 18 ) using
pliers for circlips.
Fig. 40
Fig. 41
Fig. 42
Fig. 43
•
Mounting the pistons
(see Fig. 44a, Fig. 44b, and Fig 45)
◦ Apply grease to the inside running surface of the
housing ( 1 ).
◦ Clamp the flattened section of shaft in a vise and
position the housing in the horizontal position.
◦ Align the tooth profile vertically as shown in Fig. 44a
and push the two pistons into the housing.
To obtain a counterclockwise rotation to close the
valve, install the pistons turned by 180° (see Fig. 44a).
◦ Turn the housing by 15° to 20° counterclockwise as
shown in Fig. 44b.
Fig. 44a
Fig. 44b
