3
Section I
General Information
Table 1-1. Specifications
1-1. General
This manual contains maintenance instructions for
Duff-Norton
®
translating machine screw actuators of 2, 5
and 10-Ton capacity. It describes and details procedures
for installation, disassembly, cleaning, inspection, and
assembly of these actuators.
1-2 Applications
The actuators described and illustrated in this manual are
intended for industrial use only and should not be used to
lift, support or otherwise transport people unless you have
a written statement from Duff-Norton which authorizes
the specific actuator unit, as used in your application, as
suitable for moving people.
1-3. Specifications
These actuators are intended for a clean, non-corrosive
environment with ambient temperatures ranging from
0 to 200°F. If your duty is high or severe, more frequent
lubrication should be employed. If your environment
contains abrasive particles or a corrosive atmosphere,
Duff-Norton’s Performance Line of mechanical actuators
may have a more appropriate solution for your application.
Duff-Norton publishes a Mechanical Actuator Design
Guide which you may find helpful in the selection and
application of mechanical actuators. A .pdf of the manual
can be downloaded from www.duffnorton.com. If you
need additional help, please contact Duff-Norton at
(800) 477-5002.
Capacity (Tons)
2
5
10
Model Number
E4000
E10000
E20000
Maximum Speed C-face Driven (in/min)*
72
108
108
Maximum Speed Reducer Driven (in/min)*
14.4
21.9
21.9
Lifting Screw
Diameter (in)
1
1-1/2
2
Pitch
0.25
0.375
0.5
Type
ACME
ACME
ACME
Worm Gear Ratios
6:1
6:1
8:1
Turns of Worm for 1 inch Stroke
24
16
16
Worm Torque at No Load (in-lb)
5
10
20
Maximum Horsepower per Actuator
2
4
5
Worm Torque at Full Load* (in-lb)
120
450
750
Efficiency Rating (%)
22.1
22.1
26.5
Key Torque (in-lb)
460
1750
4700
Maximum Worm Speed at Full Load (Rpm)
1051
560
420
Maximum Load at Full Horsepower and 1750 Rpm
(lb)
2332
3047
4386
Weight with 6 inch Stroke (lb)
17
34
52
Weight per Additional 1 inch Stroke (lb)
0.3
0.9
1.4
* Speed is a function of how the actuator is driven. Please contact application engineering for more information.
1-4. Important Precautions
In order to ensure that Duff-Norton actuators provide good
service over a period of years, the following precautions
should be taken:
1. Select an actuator that has a load rating greater than
the maximum load that may be imposed on it.
2. The structure on which the actuators are mounted
should have ample strength to carry the maximum load,
and should be rigid enough to prevent undue deflection
or distortion of the actuator supporting members.
3. It is essential that the actuators be carefully aligned
during installation so that the lifting screws are
perfectly plumb and the connecting shafts are exactly in
line with the worm shafts. After the actuators, shafting,
