Page 1
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 recommendations and instructions of this manual and keep it for further reference.
WARNING
Improper use can result in personal injury. To avoid injury:
• Do not use actuators to lift, support, or transport people or
loads over people without written approval from Duff-Norton.
• Read all product warnings and operating instructions.
Page 2
Contents
Section I General Information....................................................................................................3
1-1. General.......................................................................................................................3
1-2. Industrial Use Only .....................................................................................................3
1-3. Factory Preparation ....................................................................................................3
1-4. Warranty and W arranty Repair ...................................................................................3
Figure 1-5. Dimensions and Specifications...................................................................................4
Section II Installation ..................................................................................................................5
2-1. Installation Procedures ...............................................................................................5
2-2. Limit Switch Cam Adjustment.....................................................................................5
2-3. Potentiometer Installation ...........................................................................................5
Section III Operational Precautions .............................................................................................6
3-1. D.C. Motor ..................................................................................................................6
3-2. Voltage Supply ...........................................................................................................6
3-3. Clevis Pins..................................................................................................................6
Section IV Maintenance ...............................................................................................................7
4-1. Lubrication ..................................................................................................................7
4-2. Required Tools ...........................................................................................................7
4-3. General Procedures ...................................................................................................7
4-4. Disassembly ...............................................................................................................7
4-5. Assembly ....................................................................................................................8
Figure. 4-2 Brake Coupling Alignment DC Unit ..........................................................................10
Figure 5-1. Exploded Illustration DC Actuator.............................................................................11
Section V Illustrated Parts List ..................................................................................................12
5-1. Parts List...................................................................................................................12
Section VI Technical Illustrations ...............................................................................................13
6-1. Limit Switch Wiring Diagram.....................................................................................13
Figure 6-1. Limit Switch Wiring Diagram, DC Actuator ...............................................................13
6-2. Limit Switch Assembly..............................................................................................13
Figure 6-2. Limit Switch Assembly DC Actuator .........................................................................13
2
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Section I
General Information
1-1. General
This manual provides instructions for the installation, operation and maintenance of the Duff-Norton 3905, 3904,
6905 & 6904 Series DC electromechanical actuator. It includes proper procedures for the disassembly, cleaning,
inspection, rebuilding and assembly of the actuator. To
ensure efficient, long, satisfactory use of this unit, these
instructions should be followed closely .
1-2. Industrial Use Only
The 3905, 3904, 6905 & 6904 Series 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 this actuator unit, as
used in your application, as suitable for moving people.
1-3. Factory Preparation
Each actuator is carefully assembled and tested at the
factory to ensure that the motor and the mechanical components will function properly and that the actuator will lift
its rated load.
The brake is preset at the factory and no further adjustment is required. With proper maintenance, this brake
prevents the actuator from self-lowering.
The actuator is prelubricated at the factory and thus requires minimum maintenance.
Limit switches are checked at the factory for proper functioning.
The motor current draw is checked to make certain that it
is within Duff-Norton standards.
Every effort has been made to deliver this unit in its factory-approved state. Y ou should, however , carefully inspect
the actuator for damage that may have occurred during
transit.
1-4. 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 have been defective in material
and 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 their 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, DUFFNORTON MAKES NO OTHER W ARRANTIES, 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.
Authorization for return must be received from Duff-Norton
before returning any equipment for inspection or warranty
repair.
3
Page 4
0
5
10
15
20
25
30
25020015010050
Load lbs (kg)
Current Draw (amperes)
(23)
(45) (68)
(90)
(113)
0
1000
1500
2000
2500
3000
25020015010050
Load lbs (kg)
Duty Cycle* in/hr (m/hr)
(76.2)
(63.5)
(50.8)
(38.1)
(25.4)
(23)
(45) (68)
(90)
(113)
25
1
2500
(63)
20
15
10
Current Draw (amperes)
5
0
75
(1.9)
65
(1.7)
55
(1.4)
45
(1.2)
Lifting Speed in/min (m/min)
35
(0.9)
4
Load lbs (kg)
Load lbs (kg)
2000
(50)
* Duty Cycle ratings represent the total
travel (extension and retraction) per hour
with equally timed intervals between
1500
(37)
1000
(25)
Duty Cycle* in/hr (m/hr)
500
(13)
0
500400300200100
(225)(180)(135)(90)(45)
Load lbs (kg)
* Duty Cycle ratings represent the total
travel (extension and retraction) per hour
with equally timed intervals between
cycles.
24 VDC (6904)
500400300200100
(225)(180)(135)(90)(45)
cycles.
170
(4.3)
150
(3.8)
130
(3.3)
110
(2.8)
90
(2.3)
70
(1.8)
Lifting Speed in/min (m/min)
50
(1.3)
0
(23)
12 VDC (6905)
500400300200100
(225)(180)(135)(90)(45)
Figure 1-5. Dimensions and Specifications
(45) (68)
Load lbs (kg)
24 VDC (3904)
12 VDC HS (3905)
12 VDC (3905)
(90)
25020015010050
(113)
Page 5
Section II
Installation
2-1. Installation Procedures
Use Figure 6.1 on page 13 as a guide to properly attach
the 3905, 3904, 6905 & 6904 DC actuator to your power
source. Duff-Norton’s PDC series control box or 2 SPDT
relays must be used to avoid burning up the llimit switches.
2-2. Limit Switch Cam Adjustment
Important
Before attempting to set limit switch cams by these instructions, be certain that the red and black motor leads
and the “Cam” and “Gear Cam” switch leads are connected
properly per Figure 6.2. Unless leads are connected exactly as shown, the following steps will be meaningless.
1. Set Retract Position
a. Do not connect translating tube to work piece
at this time.
b. Energize and retract actuator until gear cam
opens limit switch.
NOTE
Translating tube may have to jam and spin
prior to switch activation.
c. Unscrew the translating tube until the mea-
sured distance between the housing clevis
hole centerline and the translating tube clevis
hole centerline equals the desired closed
height. If the mating clevis holes are not
aligned, manually rotate the translating tube
to align the clevises, this will be less than 180˚
rotation and the closed height of the actuator
will then be within 1/4" of the desired retracted
dimension.
d. Pin the translating tube clevis in place and
energize the actuator to check the drift.
2. Set Extend Position
a. Restraining the translating tube from turning,
operate actuator and extend to desired position.
b. Adjust steel switch cam until switch is acti-
vated, allowing for drift. (This is accomplished
by loosening socket head set screw until cam
rotates with a slight drag on the shaft when
the Allen wrench is used as a lever.)
c. Check travel and readjust if necessary.
d. Socket head set screw on cam should be
tightened after final adjustment is made. Do
not strip threads by over tightening.
At maximum load, repeatability is 1/8" in either direction
including drift and normal wear of parts.
For Units With Potentiometer
2.3 Potentiometer Installation
1. Loosen pot locknut and remove from actuator.
2. For best accessibility, solder leads to pot at this time.
3. Limit switches should be set for extreme limits of travel
per instructions. Limit switch cam adjustments
should be made per paragraph 2 prior to potentiometer installation.
CAUTION
Do not engage potentiometer shaft gear teeth
with plastic worm before reading the following
procedure. Failure to adhere to the following
procedure could cause damage to the potentiometer.
4. Retract actuator translating tube until stopped by
limit switch.
5. a. For travels up to 9" (single turn pot):
i. Turn pot shaft counterclockwise until resistance
between terminal S and CCW is approximately
100 ohms. This will be the pot's full retracted
posistion.
ii. Being careful not to turn the pot shaft, slide it
into engagement with the plastic worm and
tighten locknut.
iii. Re-checck resistance. If necessary loosen lock-
nut slightly and twist pot to re-establish 100 ohm
resistance. Pot does not have end of the resistive element. No continuity will be measured to
terminal S if the slider is in the deadband.
iv. Run actuator to full extension (do not let tube
rotate) until it is stopped by its limit switch.
v. Check resistance between S and CCW to be
sure the slider is still on the element and the
resistance is greater than 100 ohms. The pot
has enough rotation for 9.43 inches of travel.
(For strokes shorter tahn 9", the retracted resistance can be increased so that pot adjust-
ment is less critical.)
b. For travels greater than 9" (multi-turn pot):
i. Turn pot shaft counterclockwise until it reaches
its stop. Now turn shaft back clockwise 1/4 turn.
ii. Without turning pot shaft, slide pot into engage-
ment with the plastic worm and tighten locknut.
iii. Starting 1/4 turn from the end, the 3-turn pot has
enough rotation for 25" of actuator travel.
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Page 6
6. With this set-up, potentiometer will have increasing
resistance from S to CCW (and deccreasing resistance from S to CW) as the actuator extends.
2-4. Digital Position Indicator (Duff
Norton part no. SK6300-4K)
The model SK6300-4K is a highly versatile,, panel
mount, digital readout device that provides a very precise indication of actuator position. It can be
programmed to display percentage, inches, or any other
desired unit. The indicator is self calibrating wth no
need for measurements or calculations.
See the detailed instructions with the SK63004K indicator for installation and programming
instructions. Potentiometer termiinal CCW should be
connected to indicator Common, CW to Excitation Voltage, and S to Signal Voltage Input.
Section III
Operational Precautions
3-1. D.C. Motor
This motor is a totally enclosed weather resistant, permanent magnet type. This type motor is smaller, cooler
running, more efficient and has higher duty cycles than
series-wound motors. Lower current draw provides for
longer battery life. The rotation is reversible by reversing
the two color coded leads. Torque is the same in either
direction.
3-2. Voltage Supply
Avoid using a low voltage supply for the DC motor. All
wiring, switches, etc., must be of sufficient capacity to carry
the required current. (Actuator capacity may be reduced
his motor is a totally enclosed weather resistant, permanent magnet type. This type motor is smaller, cooler
running, more efficient and has higher duty cycles than
series-wound motors. Lower current draw provides for
longer battery life. The rotation is reversible by reversing
the two color coded leads. Torque is the same in either
direction.his motor is a totally enclosed weather resistant,
permanent magnet type. This type motor is smaller, cooler
running, more efficient and has higher duty cycles than
series-wound motors. Lower current draw provides for
longer battery life. The rotation is reversible by reversing
the two color coded leads. Torque is the same in either
direction at low voltages.)
3-3. Clevis Pins
The axis of the clevis pins should be parallel so that the
actuator can pivot without binding. A few drops of oil should
be used on the clevis pins.
WARNING
The actuator is not recommended for use in applications where it can be jammed. Examples
of jamming include overtraveling the limit
switches and thus jamming the nut and screw
internally at the extreme ends of the stroke, and
driving the actuator against an immovable object and thus overloading the actuator severely .
Do not operate actuator before setting limit switches. Some actuator external surface temperatures may
reach 230˚F at or near maximum allowable duty cycle.The actuator can jam a limited number of times
without damage. Therefore, consult Duff-Norton Engineering if jamming is expected.
Section IV
Maintenance
4-1. Lubrication
Duff-Norton recommends using the following lubricant in
conjunction with proper maintenance procedures of this
unit: Shell Oil Co. Darina EP2.
4-2. Required Tools
A bearing puller and press, soft jaw table clamp and common hand tools are required for proper disassembly and
assembly.
4-3. General Procedures
Duff-Norton recommends following these procedures during disassembly and assembly:
1. Tag critical parts to facilitate reassembly.
2. Mark mating surfaces to ensure proper meshing.
3. Clean and lubricate parts as required.
4. All seals must be replaced at time of rebuild.
5. All screws, washers and other small common parts
must be replaced if mutilated in any way .
4-4. Disassembly
Disassemble the 3905, 3904, 6905 & 6904 Series DC actuator as follows while referring to Figure 5.1. Read
instructions thoroughly before disassembling.
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Page 7
NOTE
Disassembly should be accomplished on a clean cloth.
1. Clamp actuator housing (22) in vise (use soft jaws).
Unit should be in horizontal position with switch
cover (2) up.
2. Remove screws (1) from cover (2) housing (22),
limit switch box and remove switch cover (2) and
gasket (3).
3. If unit has potentiometer, loosen nut (7a) and remove potentiometer (7) from potentiometer bracket
(6).
4. I. Loosen screws (back end of motor (23)) from
motor adapter (29) (do not remove screws from
motor).
II. Remove motor (23) from motor adapter (29)
(use screwdriver to separate motor end from
adaptor). Taking care that motor end bells do
not separate from motor shell.
III. Remove brake springs (27) from motor adap-
tor (29) and brake cam (26) from pinion (32).
5. Remove screws (28) from housing (22) and remove
motor adapter (29).
6. Remove pinion (32) and bearing (31) from housing
(22).
7. Remove retaining ring (30) from pinion (32) and remove bearing (31) from pinion (32).
8. Clamp housing (22) clevis end in vise (use soft
jaws), remove set screw (35) from housing (22).
9. Unscrew outer tube (41) from housing (22) and remove translating tube (50) screw (46), gear (37)
and outer tube (41) from housing (22).
10. Remove translating tube (50) from outer tube (41)
by slipping outer tube (41) over translating tube (50)
towards clevis end.
11. Remove seal (43) from outer tube (41) and press
guide bushing (42) from outer tube (41). Seal and
guide bushing need not be removed unless damaged.
12. Support screw (46) end taking care not to damage
gear (37) teeth. With a 3/16" diameter punch, drive
pin (38) from screw (46) and remove gear (37), bearing (39) and washer (40) from screw.
13. Thread screw (46) part way out of nut (48) and check
screw (46) and nut (48) for wear. There should not
be excessive play between screw and nut thread. If
screw or nut are not excessively worn, the disassembly of screw (46), nut (48) and translating tube
(50) will not be necessary.
14. Pins (49) should be approximately 1/32" above translating tube (50) OD. Grind pins (49) flush with OD of
translating tube (50).
15. Using 3/16" diameter punch, drive pins (49) far
enough into the lifting nut (48) to just clear the trans-
lating tube (50) wall. Do not drive pins against OD
of screw (46). Remove nut (48) with screw (46) from
translating tube (50).
16. Remove screw (46) from nut (48).
17. Remove pins (49) from nut (48) by driving pins (49)
remaining distance into ID of nut (48).
18. Remove stop pin (47) from screw (46).
19. If worm (44) or pin (45) must be replaced, remove
worm (44) from pin (45) by closing pliers loosely
around pin (45) behind worm and lightly tap up with
a plastic or wood hammer. To remove pin (45) from
screw (46) clamp pin (45) in vise and rotate and
pull on screw (46). Pin will come out.
20. Drive pin (25) from motor (23) shaft and remove
coupling (24).
NOTE
If coupling is not damaged, it need not be
removed.
21. If bushing (36) in housing (22) is worn, remove it.
22. If bushing (33) in housing (22) clevis is worn, press
bushing (33) out.
NOTE
If switches (16), switch gear cam (13), switch
cam (11), or gear cam shaft (10) do not have
to be replaced, do not remove. Disassembly
of actuator is complete. If these parts must
be removed, proceed as follows:
23. Remove set screws (14) from switch gear cam (13)
and set screw (12) from switch cam (11). With a 3/
16" diameter punch and hammer, tap on bearing (9)
driving bearings and gear cam shaft (10) out. (Bearings (9) will be damaged and must be replaced.)
24. Remove screws (15) (potentiometer bracket (6) if
actuator has potentiometer unit), switches (16) with
terminal wires (17, 18, 19 and 20) and insulation (8
and 21) from housing (22). Remove terminal wires
(17, 18, 19 and 20) from switches (16).
25. If gear (5) on potentiometer is damaged, it must be
replaced. Remove gear (5) from potentiometer (7)
shaft. Take care to prevent damage to potentiometer. Disassembly is now complete.
4-5. Assembly
1. Assemble drive coupling (24) on motor (23) shaft.
Align hole in coupling (24) with hole in motor (23)
shaft and install pin (25).
2. Assemble bearing (31) on pinion (32) and install
retaining ring (30) on pinion (32).
3. Apply Loctite retaining compound grade AV (or
7
Page 8
equivalent) to OD of bushing (34) and install in housing (22). Assemble into housing (22) end opposite
side of housing with 4 holes for mounting motor
adapter (29).
4. Press bushing (33) in housing (22) clevis.
5. Press bushing (36) in housing (22).
6. Install red jumper wires (17) and (18) on limit switch
(16) (jumper wire 18 with flag terminal on N.C. spade
of switch 16). See Figure 6.2.
NOTE
COM. and N.C. markings on terminal wires.
7. Install black jumper wires (19) and (20) on opposite
switch (16).
NOTE
Terminal wires with COM. and N.C. markings must be connected to identically marked
switch terminals.
Assembly of limit switch components in housing. Refer to
Figure 5.1.
NOTE
Housing (22) should be in a soft-jaw vise with
housing limit switch box up.
8. Place insulation (21) in housing (22) limit switch box.
Install switches (16) with screws (15) (N.O. and N.C.
terminals should be facing to top of box. Common
contact should face toward sides of box away from
center).
Feed terminal wires thru 1/2" tapped hole to outside
of housing.
If actuator has potentiometer feature, potentiometer
bracket (6) should be installed on top of left hand
switch (16) (switch with red terminal wires).
9. Install bushing (9) in left side of housing (22) switch
box only .
10. Insert gear cam shaft (10) into switch box from right
side of box assembling switch cam (1 1) and switch
gear cam (13) on shaft. Position cams between
switches with switch gear cam on left and switch
cam on right. Insert left end of gear cam shaft (10)
in bearing (9) and install right side bearing (9) on
gear cam shaft (10) and into right side of housing
(22) switch box. [Stake around bearing (9) to prevent axial movement of gear cam shaft (10)]
NOTE
Check to ensure that gear cam shaft rotates
freely.
11. Thread set screws (14) in switch gear cam (13) and
tighten against gear cam shaft (10) (care should be
taken not to strip threads).
8
NOTE
Rotate gear cam shaft to make sure that
switch gear cam is properly located and activates switch.
12. Thread set screw (12) in switch cam (11). Tighten
lightly against shaft to prevent movement.
13. Install pinion (32) and pinion bearing (31) into housing (22).
14. Assemble motor adapter (29) onto housing (22)
holding in place with screws (28).
15. Press bushing (42) into outer tube (41). Press seal
(43) in outer tube (41). Seal lip should be facing
inward.
16. Assemble nut (48) on screw (46). Flange of nut (48)
must face towards turned end of screw (46).
17. Install stop pin (47) into screw (46) taking care to
center pin.
18. Fill translating tube (50) approximately half full with
Shell Darina EP2 grease.
19. Assemble nut (48) into translating tube (50) and
align holes in translating tube with holes in nut. Install pins (49). Pins should be 1/32 inch above OD
of tube.
20. Assemble washer (40) on screw (46).
21. Assemble bearing (39) on gear (37) and assemble
on screw (46). Align slot in gear (37) with hole in
screw (46) and install pin (38). Pin should be centered when assembled. Be careful not to damage
gear teeth.
22. Assemble worm (44) and pin (45) assembly in screw
(46).
23. Assemble worm (44) on pin (45). Worm end with
hex I.D. must be flush with end of pin.
NOTE
Pin dia. and hole in end of screw must be
clean and free of dirt, oil and grease.
24. Clamp housing (22) in vise (use soft jaws gear cavity up). Fill cavity approximately to centerline of pinion (32) with Shell Darina EP2 grease.
25. Assemble translating tube (50), bearing (39) and
gear (37) assembly into housing. Take care not to
damage gear (37) teeth. Rotate pinion (32) while
assembling to be sure of proper mesh gear (37)
teeth with pinion (32) thread.
NOTE
Also check mesh of worm (44) with switch
gear cam (13).
26. Grease OD of translating tube (50) with Shell Darina
EP2 grease.
27. With translating tube (50) extended approximately
31/2" to 4" from washer (40), assemble outer tube
(41) on translating tube (50) and thread outer tube
Page 9
(41) into housing (22) against bearing (39). Torque
in place at 40 ± 10 foot pounds.
28. Spot drill outer tube (41) through set screw hole
(use drill slightly smaller than ID of thread). Remove
chips and install set screw (35) and lock in place
aginst outer tube (41).
29. Assembly of Motor:
I. Assemble brake cam (26) on pinion (32).
II. Install brake spring (27) into motor adaptor (29)
(see figure 4-2).
III. T aking care that the motor (23) end bells do not
separate from motor (23) shell, align drive coupling (24) pins as shown in figure 4-2 and assemble motor (23) to motor adaptor (29) holding in place with screws.
If unit has potentiometer assembly which does
not have to be replaced, or unit has no potentiometer, proceed to step 31.
30. Potentiometer Assembly
A. Assemble washer (7b) and nut (7a) on potenti-
ometer (7) (nut should not be tightened).
B. Assemble gear (5) on potentiometer (7) shaft.
NOTE
Gear should be assembled on potentiometer
shaft with a very light press fit. See sketch
for required dimensions of gear on potentiometer. Take care not to damage
potentiometer.
31. Adjust limit switches per Paragraph 2-2 and calibrate and install potentiometer (if applicable) per
Paragraph 2-3.
32. Assemble gasket (3) and cover (1) on housing (22)
and hold in place with screws (1).
Assembly is now complete.
9
Page 10
Figure. 4-2 Brake Coupling Alignment DC Unit
10
Page 11
Warning
Use only replacement
parts supplied by or approved by Duff-Norton.
Non-authorized parts may
be inadequate, resulting in
serious injury or death in
event of failure.
Figure 5-1. Exploded Illustration DC Actuator
11
Page 12
2
*
Section V
Illustrated Parts List
5-1. Parts List
Parts List For Duff-Norton Actuator 3905, 3904, 6905 & 6904 Series, DC With Limit Switch.
Index Qty.
No. Part Name Req. Part No.
1 Screws 4 H-2979
2 Switch Cover 1 SK-6905-2
2 Switch Cover(Optional Pot. Unit) 1 SK-3608-34
3 Switch Cover Gasket 1 SK-6905-14
3 Switch Cover Gasket(Optional Pot. Unit) 1 SK-3608-35
4 Instruction Decal 1 SK-6905-15
5 Worm Gear(Potentiometer Opt.) 1 SK-6415-62
6 Potentiometer Bracket (Optional) 1 SK-6415-71
7 Potentiometer (Opt.) Incl. 7a & 7b 1 †† See Below
8 Insulation (Optional) 1 SK-6415-66
9 Bushing 2 SK-6905-9
1 0 Gear Cam Shaft 1 SK-6905-5
1 1 Switch Cam 1 SK-6905-6
1 2 Set Screw 1 S-7-117
1 3 Switch Gear Cam 1 SK-6905-4
1 4 Set Screw 3 S - 7- 1
1 5 Screws 4 H-2984
16 Switch 2 SK-6905-13
1 7 Jumper Wire (Red COM.) 1 SK-6905-191 8 Jumper Wire (Red N.C.) 1 SK-6905-191 9 Jumper Wire (Black N.C.) 1 SK-6905-20
2 0 Jumper Wire (Black COM.) 1 SK-6905-19
21 Insulation 1 SK-6905-7
2 2 Housing 1 SK-6905-1
2 3 Motor 12 VDC (ST'D.) 1 SK-6405-222 3 Motor 24 VDC(Optional) 1 SK-6505-159
2 3 Motor 12 VDC High Speed Optional 1 SK-2374-43
2 4 Drive Coupling 1 SK-2374-20
25 Pin 1 S-50-68
2 6 Brake Cam 1 SK-2374-19
27 Spring 2 SK-2374-18
28 Screw 4 SK-2374-25
2 9 Motor Adaptor 1 Sk-2374-2
3 0 Retaining Ring 1 SK-2374-8
3 1 Pinion Bearing 1 SK-2374-5
32 Pinion 1 SK-2374-3
3 3 Bushing (Housing Clevis) 1 SK-6405-4
34 Bushing 1 SK-2374-10
3 5 Set Screw 1 S-7-94
36 Bushing 1 SK-2374-11
3 7 Gear 1 SK-2374-4
3 8 Pin 1 H-5167
3 9 Load Bearing 1 SK-2374-6
40 Washer 1 SK-2374-9
4 1 Outer Tube 1 SK-6405-12*
4 2 Guide Bushing 1 SK-2374-26
4 3 Seal 1 SK-2374-16
44 Worm 1 SK-6905-3
4 5 Pin 1 SK-6905-26
46 Screw 1 SK-2374-12*
47 Pin (Stop) 1 H-5159
4 8 Nut 1 SK-2374-13
4 9 Pin 2 H-5160
†† Optional
5 0 Translating Tube & Clevis Assembly 1 SK-6405-25-
* Denotes dash number is equal to travel.
Travel Potentiometer (7) Ohms Ohms/Inch Potentiometer
9" or less SK3275-24 5,000 530 SK6415-70-10A
over 9" SK6200-18 5,000 167 SK6415-70-5A
Change w/gear 7&5
12
Page 13
Technical Illustrations
6-1. Limit Switch Wiring Diagram
Section VI
Duff-Norton’s PDC Series Control Box or 2
SPDT Relays must be used to avoid burning up the limit switches.
Figure 6-1. Limit Switch Wiring Diagram, DC Actuator
6-2. Limit Switch Assembly
Low voltages may reduce load rating of
the actuator
Figure 6-2. Limit Switch Assembly DC Actuator
13
Page 14
Notes
14
Page 15
Notes
15
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© Duff-Norton 2006
P .O. Box 7010
Charlotte, NC 28241-7010
General Office (704) 558-0510
Customer Service (800) 477-5002
FAX (704) 588-1994
Email: duffnorton@cmworks.com
www.duffnorton.com
SK-6905-200
.5M05/06
ECO98865
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