6
Parker Hannifin Corporation
Helac/Cylinder Division
Enumclaw, Washington USA
www.helac.com
Helical, Hydraulic Rotary Actuators
L20 Series Service & Repair Manual
Catalog HY34-1120
Tools Required
Tools Required
MAKING A SEAL TOOL
The seal tool is merely a customized stan-
dard at head screwdriver.
1. Heat the at end with a torch until it
glows.
2. Secure the heated end of the screw-
driver in a vise and bend the heated end
to a slight radius.
3. Round o all sharp edges of the heated
end to a polished nish. The tool may be
modied slightly to your own personal
preference.
Several basic tools are required for the
disassembly and reassembly of the actuator. The
tools and their intended functions are outlined
below:
1. PIPE VISE
2. TORQUE WRENCH
Removal and replacement of port plugs and
set screws.
3. ASSORTED SCREWS
4. SAFETY GLASSES
5. END CAP REMOVAL TOOLS (provided with
Helac seal kit).
6. DRILL
7. FLASHLIGHT
Helps in locating and examining timing marks,
component failure and overall condition.
8. RUBBER MALLET
Removal and installation of shaft and piston
sleeve assembly.
9. PLASTIC MANDREL
10. PRY BAR
Removal of end cap and manual rotation
of shaft.
11. FELT MARKER
Highlights timing marks and outlines troubled
areas. Permanent ink is recommended.
12. T-HANDLE SCREW EXTRACTOR
13. HEX WRENCH SET
Removal and replacement of port plugs and
set screws (106,113).
14. SEAL TOOLS
Removal and installation of seals and wear
guides. Directions on making a seal tool are
provided at bottom.
15. PUNCH
16. DOWEL PINS
Removal and installation of end cap.
6.
1.
2.
3.
4.
8.
7.
9.
10.
5.
11.
12.
13.
14.
15.
16.
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