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English
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English
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Latin America - South
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Continuous Duty Screw Jacks

3,500 to 27,000 pound load capacity. Continuous Duty Cycle actuators are specifically designed for continuous operation. The gear set in these actuators operate in an oil bath for thermal efficiency and long life. The shell is made of a finned aluminum for better cooling properties. Additionally, the Duff-Norton ball screw system increases these models efficiency.

Features & Benefits

FEATURES & BENEFITS
Continuous Duty Cycle Actuators 3,500 to 27,000 lbs

Thermal Efficiency

The gear set in the Continuous Duty Cycle actuator operates in an oil bath for thermal efficiency and long life.

High Speed

Designed to run at a worm speed of 1750 rpm fully loaded.

Energy Efficient

Efficient design needs less power to run.

Heat Dissipating Housing Design

Sand-cast aluminum housings for added heat dissipation.

Cooling Properties

The shell is made of a finned aluminum for better cooling properties.

Additional Options

Available with C-Face Motor Adaptors and Reducers.

Continuous Duty Cycle Performance Table

Duff-Norton 7500 Series high duty cycle actuators are specifically designed for continuous operation within certain load limitations (see Maximum Allowable Duty Cycle chart below). The precision worm gear set operates in an oil bath that improves thermal efficiency. In addition, the precision drive arrangement permits the accurate prediction of operating life in terms of millions of inches of travel. This important feature allows optimum maintenance and replacement scheduling, so as to minimize downtime.

Maximum Allowable Duty Cycle at 1750 Input Speed

Model Number Maximum Capacity 75% Maximum Capacity Rated Capacity
7511 100% 100% 100%
7515 33% 67% 100%
7522 33% 67% 100%
Note: Duty cycles are based on 100°F temperature rise above ambient not to exceed 200°F using Duff-Norton’s standard oil.

 

Specifications - Continuous Duty Cycle Actuator

Model Number 7511 7515 75151 (HL) 7522 75221 (HL)
Maximum Speed Cface Driven (in/min) 118.5 102.0 215.5 81.0 215.5
Maximum Speed Reducer Driven (in/min) 23.0 20.0 43.0 16.0 32.0
Maximum Load Capacity (lbs) 3,500 12,000 5,500 27,000 13,500
Rated Load Capacity (lbs - 1000 hours life) 2,000 5,200 3,200 13,000 12,000
Lifting Screw (Diameter x Lead) 1.17 x .413 1.5 x .474 1.5 x 1.00 2.25 x .500 2.25 x 1.0
Worm Gear Ratio 6:1 8:1 8:1 10-2/3:1 10-2/3:1
Turns of Worm for 1 inch Raise 14.526 16.889 8.000 21.333 10.667
Horsepower per Actuator (Maximum at 1750 rpm) 2 5 5 10 10
Key Torque (in-lb) 260 1000 975 2400 2400
Starting Torque (in-lb at Maximum Load) 75 200 450 420 825
Running Torque (in-lb at Maximum Load) 60 170 392 350 685
Hold Back Torque* (lb-ft at Maximum Load) 4 9 9 12 12
Actuator Efficiency Rating (Percentage) 63.91 66.52 64.36 57.55 57.55
Weight with Base Raise of 6 inches (lbs) 19 43 43 95 95
Weight for Each Additional 1 inch Raise (lbs) .4 .9 .9 1.5 1.5
Note: Hold Back Torque is resisting torque at the worm shaft to keep load from running down.
All actuator units can be supplied with standard raises up to 24 inches. Special raises up to 20 feet are available upon request. Standard inverted
keyed models do not have a cover pipe (except for the 1 ton and 75 ton models). Closed height dimensions may increase for actuators supplied
with bellows boots.

Typical 7500 Series Actuator with Upright Translating Screw

CDCD_upright_translating.jpg

Typical 7500 Series Actuator with Inverted Translating Screw

CDCD_inverted_translating.jpg

Specifications - 7500 Series Continuous Duty Cycle with Translating Screw

Model Number Dimensions (inches)
7511 Upright 7515 or 75151
Upright
7522 or 75221
Upright
7510 Inverted 7514 or 75141
Inverted
7521 or 75211
Inverted
A 7 8-3/4 13-3/4 7 8-3/4 13-3/4
B 2-3/4 2-7/8 5-1/8 2-3/4 2-7/8 5-1/8
C 2.20 2 3-3/4 2.20 2 3-3/4
D 6 7 11 6 7 11
E +/-.001 1.703 +.003 / -.000 2.598 +.005 / -.000 3.750 +/-.001 1.703 +.003 / -.000 2.598 +.500 / -.001 3.750
F 1.12 1.68 2.38 1.12 1.68 2.38
G 8.6 11 14 8.6 11 14
H 4.3 5.5 7.0 4.3 5.5 7.0
I 3/4 16UNF -2A 1 14UNS -2A 1-3/4 12UN -2A 3/4 16UNF -2A 1 14UNS - 2A 1-3/4 12UN -2A
J +.000 / -.002 .500 +.000 / -.002 1.000 +.001 / -.002 1.000 +.000 / -.002 .500 +.000 / -.002 1.000 +.000 / -.002 1.000
K 1/2 R 7/8 R 1-3/8 R 1/2 R 7/8 R 1-3/8 R
L 2-1/4 2-7/8 3-3/4 2-1/4 2-7/8 3-3/4
M 2-3/4 3-3/4 5-1/8 2-3/4 3-3/4 5-1/8
N 5-1/2 7-1/2 10-1/4 5-1/2 7-1/2 10-1/4
O 4-1/2 5-3/4 7-1/2 4-1/2 5-3/4 7-1/2
P 13/32 11/16 13/16 13/32 11/16 13/16
Q* +/-.06 10.4 +/-.10 11.2 +/-.10 16.6 +/-.06 10.4 +/-.10 11.2 +/-.10 16.6
R +/-.06 8.4 +/-.10 9.2 +/-.10 13.2 +/-.06 8.4 +/-.10 9.2 +/-.10 13.2
S 1-1/8 1-1/8 2-1/4 1-1/8 1-1/8 2-1/4
T 1-21/32 2-3/8 3-1/2 1-21/32 2-3/8 3-1/2
U** 7 O.D. x 4 I.D. 7 O.D. x 4-3/4 I.D. 9.8 O.D. x 6.8 I.D. 7 O.D. x 4 I.D. 7 O.D. x 4-3/4 I.D. 9.8 O.D. x 6.8 I.D.
V 3/4 1 1-1/2 3/4 1 1-1/2
W +/-.005
2.500
+/-.005
2.75
+/-.005
3.7500
+/-.005
2.500
+/-.005
2.750
+/-.005
3.7500
X† 1.171 Dia.
0.413 Lead
1.500 Dia.
0.474 Lead
2.25 Dia.
0.500 Lead
1.171 Dia.
0.413 Lead
1.50 Dia.
0.474 Lead
2.250 Dia.
0.500 Lead
Y 2 2 3 2 2 3
Z†† 1.5
*Closed height
**Bellows boot (optional)
***Keyway for Model 7511 is 1/8 x 5/64 x 15/16 LG.
†Dimension includes diameter of ball screw with indicated lead for right-hand single thread.
††Hub Dia. for boot attachment
NOTE: When ordering, specify load and duty cycle. Keyway for Model 7515 & 7522 is 1/4 x 1/8 x 1 1/2

Options

Typical 7500 Series Actuator with Upright Rotating Screw

CDCD_Upright_Rotating.jpg

Typical 7500 Series Actuator with Inverted Rotating Screw

CDCD_Inverted_Rotating.jpg

Specifications - 7500 Series Continuous Duty Cycle with Rotating Screw

Model Number Dimensions (inches)
UM7512
Upright
UM7516 or
UM75161 Upright
UM7523 or
UM75231 Upright
DM7512 Inverted DM7516 or
DM75161 Inverted
DM7523 or
DM75231 Inverted
A 7 8-3/4 13-3/4 7 8-3/4 13-3/4
B 2-3/4 2-7/8 5-1/8 2-3/4 2-7/8 5-1/8
C 2.20 2 3-3/4 2.20 2 3-3/4
D 6 7 11 6 7 11
E +/-.001 1.703 +.003 / -.000 2.598 +.005 / -.000 3.750 +/-.001 1.703 +.003 / -.000 2.598 +.005 / -.000 3.750
F 1.12 1.68 2.38 1.12 1.68 2.38
G 8.6 11 14 8.6 11 14
H 4.3 5.5 7.0 4.3 5.5 7.0
I +.000 / -.002 0.750 +.000 / -.002 1.000 +.000 / -.002 1.750 +.000 / -.002 0.750 +.000 / -.002 1.000 +.000 / -.002 1.750
J +.000 / -.002 0.500 +.000 / -.002 1.000 +.000 / -.002 1.000 +.000 / -.002 0.500 +.000 / -.002 1.000 +.000 / -.002 1.000
K 1/2 R 7/8 R 1-3/8 R 1/2 R 7/8 R 1-3/8 R
L 2-1/4 2-7/8 3-3/4 2-1/4 2-7/8 3-3/4
M 2-3/4 3-3/4 5-1/8 2-3/4 3-3/4 5-1/8
N 5-1/2 7-1/2 10-1/4 5-1/2 7-1/2 10-1/4
O 4-1/2 5-3/4 7-1/2 4-1/2 5-3/4 7-1/2
P 13/32 11/16 13/16 13/32 11/16 13/16
Q* +/-.1 5-1/4 +/-.1 5-3/4 +/-.1 7-3/4 +/-.1 5-1/4 +/-.1 5-3/4 +/-.1 7-3/4
R .832 .985 +/-.10 1.582 .832 .895 +/-.10 1.582
S 1.13 1 2-1/4 1.13 1 2-1/4
T 4.250 4.937 5.375 4.250 4.937 5.375
U 3.395 4.33 Std. or
3.65 HL
6.706 Std. or
6.739 HL
3.395 4.33 Std. or
3.65 HL
6.706 Std. or
6.739 HL
V 3/4 1 1-1/2 3/4 1 1-1/2
W +/-.005 2.500 +/-.005 2.750 +/-.005 3.7500 +/-.005 2.500 +/-.005 2.750 +/-.005 3.7500
X† 1.171 Dia.
0.413 Lead
1.500 Dia.
0.474 Lead
2.250 Dia.
0.500 Lead
1.171 Dia.
0.413 Lead
1.500 Dia.
0.474 Lead
2.250 Dia.
0.500 Lead
Y 3.75 4.75 8.0 3.75 4.75 8.0
*Model No. UM-7516: 17/32 dia. on 4.06 dia. bolt circle.
**Keyway for Model UM-7512 is 1/8 x 5/64 x 15/16 LG.
†Dimension includes diameter of ball screw with indicated lead for right-hand
Keyway for Models UM-7516 & UM-7523 is 1/4 x 1/8 x 1 1/2.
Model No. UM-7523: 21/32 dia. on 4.375 dia. bolt circle.
Model No. UM-7512: 25/64 dia. on 3.44 dia. bolt circle.
NOTE: When ordering, specify load and duty cycle.

Typical 7500 Series Actuator with Standard Screw Ends

CDCD_Standard.jpg

 

Specifications - 7500 Series Continuous Duty Cycle with Standard Screw Ends

Number Dimensions (inches)
L M N P R S T* U* V*  
7511 1-3/16 13/32 3 4-1/4 1-1/2 2-1/4 2 3-1/8 2-1/6  
7515 1-1/4 11/16 3-1/2 5 1-3/4 2-7/8 2 3-3/4 2-1/16  
7522 2-5/16 13/16 5 7 2-5/8 4-3/4 3-3/8 5-7/8 3-7/16  
*Closed dimensions may increase for actuator units supplied with bellows boots. Call Factory.
Note: Lifting screws listed above are not yet keyed. Must be held to prevent rotation.

Specifications - 7500 Series Continuous Duty Cycle with Standard Screw Ends

Number Dimensions (inches)
A B C D* E F G H J K
7511 10-3/8 1-1/8 3/4"-16-UNF-2A 11-1/2 3/4 1 1/2" +.800/-.000 7 10-7/16 7/16
7515 11-1/4 1-1/8 1"-14-UNS-2A 13 1-1/4 1-1/4 3/4" =.010/-.000 7 11-1/4 5/8
7522 16-5/8 2-1/4 1-3/4"-12un-2A 19-1/8 1-3/4 1-3/4 1-1/4"+.010/-.000 9-13/16 16-5/8 1

Models

Continuous Duty Actuator Cut-Away Diagram

Continuous-Duty-Cycle.jpg