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Specifications subject to change without notice
Edition: August 2017
Maintenance EB 31a-01_EN
•
O-ring replacement (with stop screw OPEN)
•
(see Fig. 35)
◦ Undo nut ( 12 ) using a socket wrench.
◦ Unthread the adjusting screw ( 10a ) and remove the
washer ( 11a ) and O-ring ( 11 ). This must be done on
both sides.
◦ After renewing the O-ring ( 11 ), slightly tighten the nut
(without locking) to tighten the adjusting screw with O-
ring and washer.
◦ The two adjusting screws are first to be locked
properly once the final assembly has been completed
and on adjusting the piston.
•
Removing the piston
(see Fig. 36)
◦ After removing the end caps, hold the housing ( 1 )
stationary (possibly in a vise) and turn the shafts until
the the pistons on both sides are released.
◦ Remove both the pistons on both sides.
◦ Use a flat, blunt tool (e.g. screwdriver) to remove the
O-ring ( 16 ), piston head bearing ( 15 ), and piston
back bearing ( 5 ).
◦ Check that both pistons are free of dirt particles,
especially at the gears. Renew the O-ring, piston head
bearing ( 15 ), and piston back bearing ( 5 ).
•
Removing the shaft and bearing bushings
(see Fig. 37 and Fig. 38)
◦ Remove the spring clip ( 18 ) using pliers for circlips
and the thrust washer ( 8 ).
◦ Push the shaft from the top downward out of the
housing (see Fig. 37).
◦ Remove the top and bottom bearing bushings ( 6 and
7 ) as shown in Fig. 38.
Fig. 35
Fig. 36
Fig. 37
Fig. 38
