Duff-Norton NZ-100 - Manual (Page 4)

The Duff-Norton SuperCylinder can be used in an
unlimited number of positions and applications.
Consequently, installation procedures will vary
depending on the environment.
2-1. Inspection
Check the SuperCylinder for any shipping damage.
Be sure that motor fan does not rub fan shroud.
Look for any attached hardware or instructions.
2-2. Trunnion Mounting
Actuator trunnion pins are designed to fit standard
dimension radial spherical plain bearings
(Torrington type SF, or SKF type GEZ, for example).
It is strongly recommended that trunnion pins be
supported by some type of self-aligning bearing, as
perfect alignment of trunnion support bearings is
difficult to achieve. Standard pillow blocks are not
recommended, as their maximum static load rating
is usually less than that of the SuperCylinder. In
addition, most pillow blocks use cast gray iron
frames which are subject to fracture under heavy
loads. Duff-Norton offers Trunnion Blocks to
facilitate the installation of SCN Series
SuperCylinders. These blocks are solid steel and
house a properly sized spherical plain bearing. The
blocks are drilled for mounting either as a
conventional pillow block or as a flange unit. Heat
treated fasteners should be used for all
attachments.
Order mounting blocks per the following chart:
2-3. Clevis Pins
The SuperCylinder should be attached with a steel
clevis pin that is a close fit in the clevis hole. Duff-
Norton recommends the use of pins with hardness
of at least Rockwell C-28. Socket head cap screws
or SAE grade 8 screws may be used, if their length
is such that the threaded portion is not placed in
shear. Use of an anti-seize compound or extreme
pressure grease on the clevis pin will reduce wear
and possible noise. For extreme service, mount
the clevis pin on outboard bearings.
2-4. Orientation
SECTION II
INSTALLATION
4
NZ03, NL03, NU03 Part No. NZ03-510
NZ06, NL06, NU06 Part No. NZ06-510
NZ12, NL12, NU12 Part No. NZ12-510
NZ25, NL25, NU25 Part No. NZ25-510
SuperCylinder series Mounting Blocks (2 req’d)
The application will usually dictate the
orientation of the SuperCylinder. In
applications exposed to dripping water or
dirt, pointing the tube down to reduce the
entry of foreign material is preferred.
The SuperCylinder motor can be rotated
90˚ to change the terminal box location. On
actuators with close coupled motors, the
gasketed face of the motor retains gearbox
oil. Support the actuator with the motor
pointing straight up before loosening close
coupled motors, to avoid loss of gearbox
oil.
Several different limit switch mountings are
utilized, depending on model. If optional
flange holes are apparent, the limit switch
may be repositioned by rotating.
Factory orientation of the outer tube grease
fitting and vent plug is random (tube is
screwed down tight). Plugs may be moved
to an alternate set of holes at 90˚ if
required.
1.
1.
2.
3.
2.
3.
4.
Gearbox venting: The gearbox has three
pipe plugs at various locations. (Note:
models NZ03, NL03, and NL06 use
unvented gearboxes). Two plugs are solid.
The third plug is brass colored and
contains a spring loaded pressure relief
valve for venting built-up pressure. The
pressure relief plug must always be the
highest plug on the gearbox. If this plug is
not the highest, swap it with another plug
to make it the highest. Position the
gearbox while doing this to avoid loss of
gearbox oil. Failure to properly locate the
vent plug will lead to loss of oil and
premature gearbox failure.
SuperCylinder tube venting: The pumping
action of the tube extension and retraction,
as well as temperature changes, require
that the SuperCylinder tube be vented to
atmosphere. This vent is critical in
preventing blown out seals and/or water
entry into the actuator. Depending on the
orientation of the SuperCylinder and the
relubrication schedule, excess grease may
occasionally be pumped out of this vent.
This is normal and necessary.
Replumbing of vent in wet locations: If
SuperCylinder is subject to wet conditions,
tube vent should be repositioned to
2-5. Vent Plugs