Duff-Norton NZ-100 - Manual (Page 6)

SECTION III
LUBRICATION
The SuperCylinder screw and load bearings are
grease lubricated. The gearbox is oil-filled. Each
section has its own lubrication requirements.
3-1. Screw and Load Bearings
The screw and load bearings are factory lubricated
with Shell‚ Albida LC EP #2. This grease has been
thoroughly evaluated by Duff-Norton and has
demonstrated superior lubricating properties. If
this grease is not available in your area, please
contact your local supplier for their recommended
replacement.
3-2. Gearbox Lubrication
Unless loss of oil is apparent, the gearbox will not
normally require relubrication.
3-3. Motor Bearings
All standard motors for this product should have
permanently sealed and lubricated bearings that do
not require maintenance.
3-4. Clevis and Trunnion Pins
Clevis pins are subject to wear and can be a
source of creaking or popping noises. Pins should
be lightly greased at installation. SuperCylinders
use a high performance, PTFE fiber bushing in the
clevis. This bushing can be replaced if worn or
damaged.
The use of the recommended trunnion bearing (see
2-2) will minimize the need for trunnion
maintenance. One light shot of grease at standard
maintenance intervals should be sufficient, except
in corrosive environments.
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Lubrication Points - The SuperCylinder
has two grease fittings, one in the trunnion
housing and one at the tube guide
bushing. Shell Albida LC EP #2 is
recommended for both.
Frequency - The lubrication schedule will
vary depending on the severity of use.
Lubrication every 100 hours of actual
operation is suggested as a guideline.
Quantity – Depending on the orientation of
the actuator, there may be migration of
grease away from the outer tube guide
bushing, and possibly some loss through
the tube wiper seal. The actual quantity of
grease needed to replenish this grease
cannot readily be determined. Using a
standard hand-pumped grease gun, a
rough rule of thumb is to inject into each
grease fitting one pump of grease for
every 1000 pounds of actuator capacity.
Over lubrication will not cause damage,
but may increase grease loss.
Grease Loss - Over time, spent grease will
accumulate inside the tube. A
considerable volume of grease can exist
there without noticeable effects.
Depending on the orientation of the
actuator, it may eventually begin to ooze
grease from the tube vent or from the
wiper seal. This is not an indication of a
problem, but evidence of internal lubricant
circulation. If these grease emissions are
objectionable, the outer tube may be
removed and surplus grease cleaned out.
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Recommended lubricant- For normal
operating temperatures (20˚F to 104˚F) an
ISO 220 viscosity grade is recommended.
Higher or lower viscosity oils may be
recommended for extreme temperatures.
All gearboxes with fill plugs use Mobilgear
630 mineral oil. Smaller gearboxes,
without fill plugs, use Mobil‚ SHC630
synthetic oil. Synthetic oil may be used in
any gearbox to extend operating
temperature limits.
Quantity – Gearboxes should be
approximately half full of oil. There should
be a pipe plug at approximately the
horizontal centerline of the gearbox
(except models NZ03, NL03, NL06). Fill
with oil up to this plug level. Smaller
gearboxes, without plugs, use
approximately one pint (500ml) of oil.
These boxes will require removal of the
motor or the bottom plate to add oil.
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