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1-1. General

This manual contains maintenance instructions

for Duff-Norton® rotating ball screw actuators. It

describes and details procedures for installation,

disassembly, cleaning, inspection, and assembly of

these actuators.

1-2. Applications

Industrial Use Only 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 Company

which authorizes the specific actuator unit, as used

in your application, as suitable for moving people.

These actuators are intended for a clean, non-

1-3. Table of Specifications

Standard Actuator Upright

UM28632

Model Numbers

Inverted

DM28632 KDM28031/UM98031 KDM28004/UM98004 KDM2804/DM98004

Special Actuator

Upright

UM38632

Model Numbers

Inverted

DM32632

Capacity, Tons

1/2

Diameter of

5/8

Lifting Screw (inches)

.200 Lead

Base Size (inches)

2 1/4 x 4

Std Ratio

5:1

Worm Gear Ratios Optional

20:1

Optional

—

Std Ratio

Turns of Worm

Optional

100

For 1˝ Raise

Optional

—

Std Ratio

1/3

Maximum H.P.

Optional

1/6

Per Actuator

Optional

—

Starting Torque

Std Ratio

10.5

at Full Load

Optional

5.0

(lb-ins)

Optional

—

Running Torque

Std Ratio

9.5

at Full Load

Optional

4.5

(lb-ins)

Optional

—

Std Ratio

Actuator Efficiency Optional

Rating (%)

Optional

—

Weight with Base

2.75

Raise of 6˝ (lbs)

Weight for Each

0.10

Additional 1˝ of

Raise (lbs)

Hold-Back Torque Std Ratio

at Rated Load

Optional

0.5

(lb-ft)

Optional

—

Note: Hold back torque is restraining torque at the worm shaft, to keep load from running down.

*Dimensionally same as Model 2803

‡ Dimensionally same as Model 9811

∆ Prefix for these model numbers is KUM for upright units and KDM for inverted units.

Section I

General Information

KUM2803/UM9803

KUM28004/UM98004 KUM2804/UM9804

UM3803/UM9803

UM38004/UM98004

UM3804/UM108004 UM10806

DM3803/UM9803

DM38004/UM98004

DM3804/DM108004 DM10806

.250 Lead

1.000 Lead

3 1/2 x 7**

3 1/2 x 7

6:1

12:1

24:1

—

3/4

1/2

—

180

—

160

—

0.3

0.5

—

† Dimensionally same as Model 9806

** 9803 Base is 4 1/8˝ x 6˝

corrosive environment with ambient temperatures

ranging from -20 to 200 ° F. If your environment is

dirty and/or contains abrasive particles it is impor-

tant to protect the screw with a boot. If your atmo-

sphere is corrosive it is important to specify a non-

corrosive material or finish. Duff-Norton can provide

stainless steel, nickel plated or epoxy coated actua-

tors. If your duty is high or your use severe, more

frequent lubrication should be employed. Duff-

Norton publishes a Mechanical Actuator Design

Guide, Catalog No. 2003, which you may find

helpful in the selection and application of mechani-

cal actuators. If you need additional help, please

contact Duff-Norton at (800) 477-5002.

UM9806

UM98061

UM9811

DM9806

DM98061

DM9811

UM10806

UM10811

DM10806

DM10811

1 11/64

1 1/2

.413 Lead

.474 Lead 1.000 Lead

.474 Lead

3 1/2 x 7

6 x 8

7 1/2 x 8 3/4 7 1/2 x 8 3/4 8 1/4 x 11 10 1/4 x 13 3/4 9 3/4 x 19 3/4

6:1

8:1

12:1

24:1

—

14.526

12.667

16.888

29.052

50.667

58.104

—

3/4

1 1/2

1/2

—

110

220

500

350

206

175

—

100

180

410

300

183

150

—

0.4

0.9

0.5

—

UM98111

AUM9821

UM9826

DM98111

ADM9821

DM9826

UM10811

UM10821

UM10826

DM10811

DM10821

DM10826

1 1/2

2 1/4

1.000 Lead .500 Lead

.660 Lead

8:1

10 2/3:1

24:1

32:1

—

16.16

48.48

—

1 1/2

2 1/2

—

800

700

925

400

325

475

—

700

650

825

290

300

425

—

115

235

0.9

1.5

2.9

0.5

—

UM2861

DM2861

UM3861

DM3861

1.000 Lead

10 2/3:1

32:1

—

10.66

—

2,700

1,500

—

2,200

1,200

—

520

5.0

—