Duff-Norton SK2463-22 (Modular Actuator Acme Screw) - Manual (Page 5)

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NOTE: 1. Models M-2462 and M-2464 are self-lowering and a motor brake should be used.
2. Models M-2463 and M-2465 may drift 0.75 in (20:1 ratio) to 2.0 in (5:1 ratio) when the motor is shut off. If this is undesirable, a motor brake should be used.
Section IV
Operation, Maintenance, and Inspection
4-1. Improper Loading
Warning
The actuator must NOT be subjected to side
loading or binding (i.e., a bending moment
across the actuator) at any point in its travel. It
is the responsibility of the installer to ensure
that the mounting points cannot transmit such
loading to the actuator anywhere between full
retraction and full extension. Failure to observe
this warning will void the warranty on the ac-
tuator.
4-2. Clevis Pins
The axes of the clevis pins should be parallel so that the
actuator can pivot without binding. A few drops of oil should
be applied to the clevis pins on installation and periodi-
cally thereafter.
4-3. Lubrication
The actuator is lubricated at the factory with Shell Albida
LC EP#2 (Shell Oil Co. product code 70311). This grease
has been thoroughly evaluated by Duff-Norton and dem-
onstrated to provide superior actuator life. Other greases
may provide satisfactory service, with some acceleration
of wear. Only high quality, NLGI #2EP, lithium based
greases should be used.
The actuator should be lubricated periodically (see NOTE
under Paragraph 4-4, "Inspection"), using the grease fit-
ting. On Rotating Screw actuators, the lifting screw and
nut can be lubricated by painting a light coat of grease on
the screw at a point that passes through the nut. To lubri-
cate the lifting screw and nut on a Translating Tube
actuator, first loosen the set screws and unscrew the outer
tube from the housing to expose the lifting screw threads.
The actuator should be disassembled, cleaned, inspected,
and relubricated after 500,000 inches of travel under nor-
mal conditions, or earlier if the need is indicated by
inspection or by a squealing from the lifting screw and nut
area. Follow the instructions in Section V to overhaul the
actuator.
4-4. Inspection
The actuator should be inspected periodically (see NOTE
below), with attention given to the following items:
1. Clevis ends for wear, cracks, distortion, or other deg-
radation or damage.
2. Loose belts, screws, or other hardware on the ac-
tuator or its mounting points.
3. Limit switches (if so equipped) for proper setting and
operation.
4. Lifting screw, lifting nut, and gear set for excessive
wear or lack of lubrication (see instructions under
Paragraph 4-3, "Lubrication").
Any of the above deficiencies should be corrected before
the actuator is returned to service.
NOTE
Periodic Inspection and Lubrication: The ex-
act periods for inspection and lubrication of
the actuator cannot be predetermined be-
cause of the many variables involved, such
as frequency of operation, type and magni-
tude of loading, and operational environment.
Determination should be based on the user's
experience. It is recommended that the user
begin with a weekly inspection, extending the
inspection period to monthly, quarterly, or
annually, based on his weekly experience.
Model No. Screw Dia.
5:1 20:1 5:1 20:1 5:1 20:1 5:1 20:1 5:1 20:1 5:1 20:1
1725 300 700 500 1000 700 1500 170 43
1140 450 1000 700 1500 1100 2000 114 28
1725 400 900 600 1400 900 2000 86 21
1140 600 1400 900 2000 1400 2000 57 14
M-2462
M-2464
M-2463
M-2465
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Motor
RPM
1.0 Dia. Acme
.25 Pitch
R.H. Single
20 80 29
Torque Turns of Lifting
in/min
Speed
.875 Dia. Acme
.25 Pitch
R.H. Double
10 40 39 18
Motor Motor
Ratio
Worm/ 1"
Travel
lb/in @
1000 lb Load
Ratio Ratio Ratio
Rated Load
1/3 hp 1/2 hp
Ratio
3/4 hp
Ratio
Motor
3-3. Specifications