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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
Product Indentification
Product Identification
Each Helac actuator is individually serial
numbered. The serial number is a ve or six digit
number and must be provided before parts and/
or service issues can be addressed.
The serial number can be found on the
Identication (ID) Tag that is axed to all
actuators. The tag is a thin, silver colored, plastic
material with a self-adhesive backing. Information
is imprinted in black. The tag is located either
on the side plate or on the housing tube of the
actuator. In some cases, the ID tag may be
painted over by the OEM (Original Equipment
Manufacturer). Typical sample tag locations are
seen below. Note that the model number may
begin with either "HP" or "L20".
Additionally, the serial number of the actuator is
stamped onto the side plate or the housing tube.
It may be necessary to remove paint to expose
the serial number.
If the ID tag is not attached to the actuator and/or
the stamped serial number cannot be located,
the basic actuator model can be identied by
measuring the outer diameter of the drilled and
tapped shaft ange.
Model Flange Diameter
L20-4.5 4.10” (104.14 mm)
L20-8.2 4.60” (116.84 mm)
L20-15 5.60” (142.24 mm)
L20-25 6.70” (170.18 mm)
L20-30 7.20” (182.88 mm)
L20-39 7.70” (195.58 mm)
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