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32 Stellar Cable Hoist Owner’s Manual
Step 9: Pneumatic Control Installation
The pneumatic controller provided with the Stellar Cable Hoist are dual three-way regulat-
ing valves. Output of the controllers is proportional to the control lever position and is bal-
anced against the force of an internal spring.
Pneumatic Actuator Installation:
The pneumatic actuator has been partially assembled and pre-lubricated for ease of
installation. The actuator does not have to be disassembled for installation.
1. Remove the valve from the hydraulic tank if previously installed.
2. Find a suitable area free of dust and dirt to attach the pneumatic actuators.
3. Set the hydraulic valve on its mounting base.
4. Determine which spools are to be pneumatically controlled.
5. From the valve assembly:
a. Remove and discard the 1/4” retainer screws
and the valve spring cover.
b. Retain the handle end of the spool. Using a
5/16” hex Allen wrench, remove and discard
the 3/8” shoulder bolt and washer from the
end of the valve spool exposed by the
removal of the valve spring cover. Note: It
may be necessary to give the hex Allen
wrench a sharp rap to break the socket head
screw loose.
c. Remove and discard the original centering spring. Keep the two original centering
cups and the sleeve for reuse.
d. Ensure the original seal retainer on the valve spool is properly seated.
6. Assemble the new centering spring (item 2)
supplied with the pneumatic actuator using
the original centering cups and sleeve as
shown.
7. Apply a small bead of removable thread lock
to the threads of the spool adapter (item 2).
Holding the spool on the opposing end, hand
tighten (torque 45-50 in-lbs) in the centering
spring assembly by inserting 1/4” hex wrench
through the rear fitting port into the end of the
piston (Item 13). Do not use an air gun. Make
certain that the spring assembly does not bind
on the centering cups.
8. Make certain the o-ring (item 15) is in place.
Secure the pneumatic actuator assembly to
the valve body using the four socket head
screws and lock washers (Items 4 & 5). Test for
proper alignment by turning the valve spool.
The spool should rotate freely.
9. Assemble the valve to the mounting plate on
the hydraulic tank. Test spool for free move-
ment.
Hex. Slot
Spool
Centering Cups
Apply Removable
Threadlock Here.
Seal Retainer
Tighten the assembly by hand using
a 1/4” Hex. Wrench Max. Torque 45-50 in-lbs
Do not use an air gun.