Duff-Norton SK-2390-B Guide

ESSENTIALS PLATFORM
Mechanical Actuators
Installation, Operation &
Maintenance Instructions
2 Ton to 10 Ton Capacity
Translating Machine
Screw Actuators
Publication Part No. SK-2390-B
CAUTION
This manual contains important information for the correct installation, operation and maintenance of the equipment
described herein. All persons involved in such installation, operation, and maintenance should be thoroughly familiar
with the contents. To safeguard against the possibility of personal injury or property damage, follow the recommenda-
tions and instructions of this manual and keep it for further reference.
WARNING
The equipment shown in this manual is intended for industrial use only and should not be used to lift, support, or other-
wise transport people.
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Contents
Section I General Information
1-1. General 3
1-2. Applications 3
 1-3. Specications 3
Table 1-1. SpecicationsTable 3
1-4. Important Precautions 4
1-5. Warranty and Warranty Repair 4
Section II Maintenance
2-1. Lubrication 4
2-2. Rebuild Procedures 4
2-3. Required Tools 5
2-4. 2, 5, and 10 Ton Disassembly (Refer to Figure 3-1) 5
2-5. Cleaning 5
2-6. Inspection (Refer to Figure 3-1) 5
2-7. 2, 5, and 10 Ton Assembly (Refer to Figure 3-1) 5
Section III Illustrated Parts List
3-1. General 6
Table 3-1. Parts List for 2, 5, and 10 Ton Translating Machine Screw 6
Figure 3-1. Exploded Illustration 2, 5, and 10 Ton Translating Machine Screw 7

3
Section I
General Information
Table 1-1. Specications
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specicactuatorunit,asusedinyourapplication,as
suitable for moving people.
1-3. Specications
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nd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
[phone].
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
Eciency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deection
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,

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Section II
Maintenance
2-1. Lubrication
Unlessotherwisespecied,actuatorsareshippedpacked
withgreasewhichshouldbesucientforonemonth
of normal operation. For normal operation, the actuator
should be lubricated once a month using Mobile XHP461 or
XHP462 Extreme Pressure grease.
This grease has been thoroughly evaluated in Duff-Norton
actuators and has demonstrated superior lubricating
properties affecting both wear life and maximum duty
cycle. Duff-Norton is not aware of an equivalent grease.
If this grease is not available in your area please contact
your local supplier for their recommendations. Greases
containingmolybdenumdisuldeshouldnotbeused.
For severe service conditions, the actuators should be
lubricated more frequently using the above grease (daily to
weekly depending upon the conditions). If duty is heavy, an
automatic lubrication system is strongly recommended.
NOTE
Where lifting screws are not protected from airborne, dirt,
dust, etc., bellows boots should be used. Inspect frequent-
lyatregularintervalstobecertainthatalubricatinglmis
present. Lifting screws should never be run dry.
2-2. Rebuild Procedure
Duff-Norton recommends the following procedures for
assembly and disassembly of actuators.
gear boxes, etc., are coupled together, it should be
possible to turn the main drive shaft by hand. If there
are no signs of binding or misalignment, the actuator
system is then ready for normal operation.
4. Actuators should have a greater raise than is needed
in the actual installation. Should it be necessary to
operate these actuators at the extreme limits of travel,
it should be done cautiously.
NOTE
Do not allow actuator travel to go beyond catalog
closed height of actuator or serious damage to internal
mechanism may result. Refer to the design guide for
closed height of respective units.
5. The worm shaft speed for these actuators should not exceed
thevaluesspeciedinTable1-1ofone-fourth(orless)ofthe
actuators load rating.
6. The lifting screw should not be permitted to accumulate
dust and grit on the threads. If possible, lifting screws
should be returned to closed position when not in use.
NOTE
Where lifting screws are not protected from airborne dirt,
dust, etc., bellows boots should be used. Inspect frequent-
lyatregularintervalstobecertainthatalubricationlmis
present. Lifting screws should never be run dry.
7. When using a 2, 5, or 10 ton actuator, a periodic check
of backlash of the lifting screw thread is recommended
to check wear of the worm gear internal threads.
The normal backlash on a new unit of this type is
approximately.010inch.Backlashof50%ormoreof
the thread thickness indicates the need to replace the
worm gear.
NOTE
Forloadsoffrom25%to100%ofactuatorcapacity,
torque requirements are approximately proportioned to
the load.
8. The lubrication procedures for normal and severe
service conditions, as described in Section II, paragraph
2-1, should be closely followed.
1-5. Warranty and Warranty Repair
Subject to the conditions stated herein, Duff-Norton will
repair or replace, without charge, any parts proven to
Duff-Norton’s satisfaction to have been defective 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modiedbyanyone
without Duff-Norton’s authorization is not warranted by
Duff-Norton. EXCEPT AS STATED HEREIN, DUFF-NORTON
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 contact Duff-Norton Customer Service. Authorization
for return must be received from the Duff-Norton before
returning any equipment for inspection or warranty repair.

5
1. Tag critical parts to facilitate reassembly.
2. Mark mating surfaces to ensure proper meshing.
3. Clean and lubricate all parts as required.
4. All seals must be replaced when rebuilding.
5. All screws, washers and other small common parts
must be replaced if damaged in any way.
6. Replacedamagedorfrozenlubricationttingswithnewones.
2-3 Required Tools
A bearing puller or press, and common hand tools are
necessary for proper assembly and disassembly.
2-4. Disassembly (Refer to Figure 3-1)
1. Remove lifting screw (19) from actuator.
2. Remove bottom pipe (16) from shell (1) (upright models) or
shell cap (4) (inverted models) or base plate as applicable.
3. Loosen and remove set screws (14) in cap (4) and
remove cap from shell (1).
NOTE
It may be necessary to break shell cap or base plate loose
with a hammer.
4. Remove worm gear (3) from shell (1).
5. Remove top load bearing (2) which may be attached to
either shell cap (4) or worm gear (3).
NOTE
Use only a soft face hammer to tap bearings loose.
6. Remove bottom load bearing (2) which may be attached
to either the shell (1) base plate or worm gear (3).
7. Remove four cap screws (5) from each of the two worm
anges(8)andremoveanges.
NOTE
Becarefulnottoloseangeshims(9and10).
8. Pressoilseal(7)outofange(8).
9. Remove worm (12) and worm bearings (11) from shell (1)
by striking one end of worm with a soft face hammer.
10. Remove worm bearings (15) from worm (14) with
bearing puller or press. Note: This step will not be
necessary if worm or worm bearings are not damaged.
2-5. Cleaning
1. Use degreasing solvent to remove grease or oil from all parts.
NOTE
Remove grease from unit and do not reuse old grease.
CAUTION
Provide adequate ventilation during the use of cleaning
agents; avoid prolonged breathing of fumes and contact
with skin.
2. Use clean hot water or a soap solution for general
cleaning of painted surfaces.
3. Dry parts thoroughly after cleaning.
NOTE
Remove grease from unit and do not reuse old grease.
2-6. Inspection (Refer to Figure 3-1)
Inspect actuator parts as follows:
1. Make a visual inspection of shell (1) for broken, cracked
or distorted areas. Check threads of all bores for burrs
or broken threads.
2. Check shell cap (4), base plate, bottom pipe (16), lifting
screw (19), worm gear (3) for burrs or scratches on
their working or mating surfaces.
3. Checktbetweenliftingscrewthreadandinternal
threadinwormgear.Iftisexcessivelyloose,replace
worm gear or lifting screw as required.
4. Check small common components (screws, etc.) and
replace as required.
5. Check bearings (2) and (11) for seizure, galling or play
and replace as required.
2-7. Assembly (Refer to Figure 3-1)
1. Press worm bearings (11) onto worm shaft (12) making
sure that bearings are seated properly against shoulder.
NOTE
When tapered roller bearings are used, the small end of
the cone should point to the worm end.
2. Position worm shaft end (12) in shell (1).
NOTE
If tapered roller bearings are used, tap worm bearing cups
into place in the shell.
3. Pressoilseals(7)intowormange(8).
NOTE
The sealing element should point inward.
4. Positionwormanges(8)withshims(9and10)and
bolt in place.
5. Position bottom load bearing (2) or bearing cup in shell (1).
5a. Press load bearing cones onto worm gear (3).
6. Install worm gear (3) in shell (1).

6
NOTE
Strike each end of worm shaft sharply with a soft face
hammertoseatbearingproperly.Recheckangebolts
for tightness. Worm should turn freely with minimum drag
and end play. If too much end play is present, remove
shims as required. If worm does not turn freely, add shims
as required.
7. Install top load bearing (2) or bearing cup on
worm gear (3),
8. Fill housing fully with grease.
9. Install shell cap (4) and screw down until tight.
NOTE
Shellcapangedoesnotnecessarilyhavetobearagainst
top of shell, there will usually be a gap. This will put a
slight drag on the worm. If worm is hard to turn, back off
slightly on the shell cap.
10. Lock base plate in place with set screws.
NOTE
If new parts have been installed, it may be necessary to
respot holes for these screws.
11. Screw bottom pipe (16) into shell (1) (upright models)
or into shell cap (4) (inverted models).
12. Install guide bushing (17). Brush lifting screw (19) with
alightlmofgreaseandinstallinactuator.
13. Operate unit to ensure proper functioning of all
components prior to reinstallation.
3-1. General
This section contains an exploded illustration of the 2, 5, and
10 Ton Series machine screw actuators. The number adjacent
to each part on the illustration is the index number. Next to this
index number on the parts list is the part name.
When ordering parts be sure to include:
1. The nameplate model of your unit.
2. lndex number and name of part.
Section III
Illustrated Parts List
Table 3-1. Parts List
For 2, 5, and 10 Ton
Translating Machine Screw Actuators
Index
No. Part Name Qt.
Req.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Shell
Bearing, Load
Gear, Worm
Cap, Shell
Bolt, Hex
Washer, Lock
Seal, Oil
Flange
Shim,0.01″(Ifrequired)
Shim, 0.003” (If required)
Bearing, Worm
Worm
Fitting, Grease
Screw, Set
Screw, Drive
Pipe Assembly
Bushing, Guide
Featured, Attachment
Screw, Lifting
1
2
1
1
8
8
2
2
2
2
2
1
1
2
2
1
1
1
1

7
12
13
16
1
2
3
2
14
4
17
18
15
19
11
10
9
8
7
6
5
Figure 3-1. Exploded Illustration 2, 5, and 10 Ton
Translating Machine Screw Actuators

SK-2390-B
10/20
2020 ©vDuff-Norton®- A Columbus McKinnon Company.
All rights reserved.
9415 Pioneer Avenue, Suite 100, Charlotte NC 28273
800-477-5002 • www.duffnorton.com • duffnor[email protected]