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Specifications subject to change without notice
Edition: August 2017
Maintenance EB 31a-01_EN
•
Removing the pistons:
(see Fig. 19)
◦ Clamp the housing ( 29 ) in a vise or similar device.
Turn the shaft ( 30 ) until the pistons ( 25 ) are
accessible.
Note:
Do not apply air pressure to remove the pistons
from the housing (projectile impact).
◦ Carefully remove the piston O-rings ( 16 ) using a
screwdriver. Remove the piston bearing ( 5 ) and
piston bearing ( 15 ).
Renew gasket ( 14 ) when replacing spare parts.
•
Removing the shaft
(see Fig. 20)
◦ Use pliers for circlips to carefully remove the spring
clip ( 18 ). Remove the thrust bearing ( 8 ) and thrust
washer ( 10 ).
◦ Push down on the top of the shaft ( 30 ) until it is
possible to remove the cam ( 1 ) and the internal thrust
bearing ( 8 ). Pull the shaft ( 30 ) all the way out of the
housing.
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 )
as well as top and bottom shaft seals ( 20 and 21 ).
◦ Renew the bearing bushings ( 6 and 7 ), internal and
external thrust bearing ( 8 ) as well as the seals ( 20
and 21 ) when replacing all the spare parts.
Note:
Thoroughly clean all dismantled parts as well
as any parts that have not been renewed and
check them for wear.
6.1.3
Actuator assembly:
Note:
Before assembly, ensure that all parts are
clean and in perfect condition. Use the grease
recommended by Pfeiffer (Table 1).
•
Shaft assembly
(see Fig. 21, Fig. 22a and Fig. 22b)
◦ Mount the top and bottom bearing bushings ( 6 and 7 )
followed by the top and bottom shaft seals ( 20 and
21 ) onto the shaft.
◦ Apply grease to the top and bottom of the shaft as
shown in Fig. 21.
◦ Guide the shaft ( 30 ) partially into the housing ( 29 )
◦ Mount the cam ( 1 ) in the required position, in relation
to the top and bottom position of the shaft as well in
relation to the direction of rotation of the actuator (see
Fig. 22).
◦ Place the internal thrust bearing ( 8 ) onto the shaft
( 30 ). Guide the shaft completely into the housing.
◦ Mount the external thrust bearing ( 8 ), thrust washer
( 10 ), and spring clip ( 18 ) (using pliers).
Fig. 19
Fig. 20
Fig. 21
