6-2. Parts List for Rotating Screw Actuators............................................................11
6-3. Parts List for Translating Tube Actuators (Models M-2464 and M-2465) ..........12
2
Section I
Introduction
1-1. General
This manual provides instructions for the installation, operation, and maintenance of the Duff-Norton® Modular
Actuator. It includes proper procedures for the disassembly , cleaning, inspection, rebuilding, lubrication, and
assembly of the actuator. To ensure efficient and long,
satisfactory use of this unit, read and understand the
information herein, and follow the instructions closely.
1-2. Intended Use
The Duff-Norton® Modular Actuators described and illustrated in this manual are intended for industrial use
only and should not be used to lift, transport, or otherwise support people.
1-3. Safety Considerations
1. Avoid touching exterior surfaces of the actuator.
Surface temperatures may reach 230 ° F during
prolonged use.
2. Make certain that the electric motor used conforms
to the requirements of the actuator.
1-4. Unwarranted Applications
CAUTION
These actuators are not recommended
or warranted for use in applications involving the following activities or
conditions:
1. Lifting, supporting, or positioning of people where
a malfunction might result in bodily injury.
2. Side loading or binding of the actuator. (See Par agraph 4-1, "Improper Loading".)
NOTE
If in doubt about the suitability of the actuator for you application, consult the Duff-Norton
Engineering Department.
1-5. Warranty and Warranty Repair
Subject to the conditions stated herein, Duff-Norton will
repair or replace, without charge, any parts proven to DuffNorton’s satisfaction to hav e been defectiv e in material or
workmanship. Claims must be made within one year after date of shipment. Duff-Norton will not repair or replace
any parts that become inoperative because of improper
maintenance, eccentric loading, overloading, chemical or
abrasive action excessive heat, or other abuse
Equipment and accessories not of Duff-Norton’s manufacture are warranted only to the extent that they are
warranted by the manufacturer, and only if the claimed
defect arose during normal use, applications and service.
Equipment which has been altered or modified by anyone
without Duff-Norton’s authorization is not warranted by
Duff-Norton. EXCEPT AS STATED HEREIN, DUFFNORT ON MAKES NO OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
If you have any questions concerning warranty repair,
please consult a Duff-Norton Warehouse and Customer
Service Center for the name and address of your nearest
Duff-Norton actuator warranty repair facility.
Authorization for return must be granted b y the Duff-Norton
Company before any equipment may be returned for inspection or warranty repair.
Section II
Installation
Duff-Norton's Modular Actuator is designed to be a versatile piece of equipment which can be used in many
different applications; consequently, installation procedures will vary widely with customer requirements
2-1. Motor Installation
The Modular Actuator is designed to accept a standard
NEMA 56 frame electric motor with C-face mounting, to
be supplied by the customer. For instructions on installing the motor on the actuator, see Paragraph 5-5, steps
19-21 (these steps apply to both Rotating Screw and T ranslating Tube actuators).
2-2. Installation of the Actuator
The actuator has two bolt patterns for convenient attach-
ment of the actuator to the application: both the tw o-hole
pattern (17/32-inch unthreaded holes 4 inches apart) and
the four-hole pattern (1/2-20 threaded holes on a 2.55
inch square) can be used to bolt the actuator to a wide
variety of mounting points; the four-hole pattern will also
accept standard hydraulic type end fittings.
The lifting nut (on Rotating Screw actuators) and the clevis
end (on Traslating Tube actuators) must be restrained
against rotation in order for the actuator to lift its load.
2-3. Limit Switches
Duff-Norton recommends that limit switches be incorporated in the installation to prevent o vertravel of the actuator
in either direction and to protect the actuator against internal jamming. Duff-Norton limit switches to fit this
actuator are available at an additional cost.
3
Section III
Dimensions and Specifications
3-1. Dimensions - Rotating Screw Actuators
(Models M-2462 and M-2463)
Warning
Use only replacement parts supplied
by or approved by Duff-Norton. Nonauthorized parts may be inadequate,
resulting in serious injury or death
in event of failure.
3-2. Dimensions - Translating Tube Actuators
(Models M-2464 and M-2465)
4
q
g
p
p
p
p
3-3. Specifications
Tor
Model No.Screw Dia.
M-2462
M-2464
M-2463
M-2465
NOTE: 1. Models M-2462 and M-2464 are self-lowering and a motor brake should be used.
.875 Dia. Acme
.25 Pitch
R.H. Double
1.0 Dia. Acme
.25 Pitch
R.H. Single
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.
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. F ailure to observe
this warning will void the warranty on the actuator.
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 periodically 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 b y Duff-Norton and demonstrated 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 fitting. 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 lubricate the lifting screw and nut on a Translating Tube
actuator, first loosen the set scre ws 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 normal 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 o verhaul 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 degradation or damage.
2. Loose belts, screws, or other hardware on the actuator 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 bef ore
the actuator is returned to service.
NOTE
Periodic Inspection and Lubrication: The exact periods for inspection and lubrication of
the actuator cannot be predetermined because of the many variables involved, such
as frequency of operation, type and magnitude 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.
S
eed
in/min
Ratio
5
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