20
Parker Hannifin Corporation
Helac/Cylinder Division
Enumclaw, Washington USA
www.helac.com
Helical, Hydraulic Rotary Actuators
L20 Series Service & Repair Manual
Catalog HY34-1120
Assembly
Assembly
13. Install two bolts in the threaded holes
in the ange. Using a metal bar, rotate
the shaft in a clockwise direction until
the wear guides are seated inside the
housing bore.
14. Install the stop tube (400) onto the shaft
end if necessary. Stop tubes are an
available option to limit the rotation of an
actuator.
As the shaft is rotated, be
careful not to disengage the
piston and housing gearing.
16. Thread the end cap (04) onto the shaft
(02). Make sure the wear guide remains
in place on the end cap as it is threaded
into the housing (01).
15.
Coat the threads on the end of the shaft
with anti-seize grease to prevent galling.
12. Looking at the actuator from the end
opposite the shaft ange, use the existing
timing marks to align the gear teeth on
the shaft (02) with the gear teeth on the
inside of the piston (03). When the marks
align, gently tap the ange end of the
shaft with a rubber mallet until the gear
teeth engage.
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