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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
5. Install the wear guide (302) on the end
cap (04) and shaft (02).
7.
Install the inner T-seal (200) into the
appropriate groove in the piston (03).
Use a circular motion to insure the seal is
correctly seated in the groove.
Install the outer T-seal (202) by stretching
it around the groove in a circular motion.
Each T-seal has 2 back-up rings (see
Assembly Drawing on page 8 for
orientation).
6.
Install the O-ring (204) and back-up ring
(207) into the inner seal groove on the
end cap (04).
4.
Using a seal tool (see Tools Required on
page 6) install the main pressure seal
(205) onto shaft (02) and end cap (04).
Use the seal tool in a circular motion.
Beginning with the inner seal (200)
insert one end of backup ring in the
lower groove and feed the rest in using
a circular motion. Make sure the wedged
ends overlap correctly.
Insert the other back up ring in upper
groove.
Repeat both of these steps for the outer
seal (202).
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