3
Table 2.
4800 and 9400 Series
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 actuator is mounted
should have ample strength to carry the maxi-
mum load, and should be rigid enough to pre-
vent undue deflection or distortion of the actua-
tor supporting members.
3. It is essential that the actuator 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, 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, that actuator
system is then ready for normal operation.
4. Actuators should have a greater raise than is
needed in the actual application. Should it be
necessary to operate the actuator at the ex-
treme limits of travel, it should be done cau-
tiously.
CAUTION
Do not allow actuator travel to go beyond
specified (catalog) closed height, or serious
damage to internal mechanism may result.
Refer to table of specifications (par. 1-3) for
closed heights of respective units.
5. The worm shaft speed for these actuators
should not exceed 500 RPM for heavy loads,
1200 RPM for light loads 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.
CAUTION
Where lifting screws are not protected from
airborne dirt, dust, etc., bellows boots should
be used. Inspect frequently at regular internals
to be certain that a lubricating film is present.
Lifting screws should never be run dry.
7. When using an 1800 (2000) or 9000 (10000)
Series 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.
The 4800 and 9400 Series Anti-backlash Actua-
Note:
Additional specifications are same as for Series 1800 and 9000. See Table 1.
*
For loads from 25% to 100% of actuator load rating. Torque requirements are approximately proportional to the load.
**
Closed heights are for standard upright top plate models and may vary with different screw end, inverted models, or when bellows boot is used.
Table 3.
Decimal Ratios
Note:
All other data for these models same as shown in Table 1.
Standard Actuator
Upright
4802 & 9402
9405
9410
9415
9420
9425
9435
4850 & 9450
9475
Model No.
Inverted
4801 & 9401
9404
9409
9414
9419
9424
9434
4849 & 9449
9474
Special Actuator
Upright
5802 & 10402
10405
10410
10415
10420
10425
10435
5850 & 10450
10475
Model No.
Inverted
5801 & 10401
10404
10409
10414
10419
10424
10434
5849 & 10449
10474
Rated Load (tons)
2
5
10
15
20
25
35
50
75
Torque at
Std Ratio
135
500
1045
1573
2255
1320
4400
4620
13200
Full Load* (in-lbs)
Optional
55
205
905
1290
1320
1320
2640
4620
7260
Actuator Efficiency Std Ratio
19.6
19.9
19.8
18.0
17.6
13.4
13.7
12.4
11.3
Rating (%)
Optional
11.9
10.9
12.6
11.0
10.8
8.3
7.7
7.3
6.8
Closed Height (in)**
5 1/4
7
7 1/4
8
9 1/2
12
13
14
18 1/2
Weight with Base
Raise of 6˝ (lbs)
18
37
55
70
101
197
250
440
700
Standard Actuator Upright
1802 & 9002
9005
9010
9015
9020
9025
Model No.
Inverted
1801 & 9001
9004
9009
9014
9019
9024
Special Actuator
Upright
2002 & 10002
10005
10010
10015
10020
10025
Model No.
Inverted
2001 & 10001
10004
10009
10014
10019
10024
Rated Load (tons)
2
5
10
15
20
25
1˝ Dia.
1 1/2˝ Dia.
2˝ Dia.
2 1/4˝ Dia.
2 1/2˝ Dia.
3˝ Dia.
Lifting Screw (inches)
.250 Pitch
.250 Pitch
.250 Pitch
.250 Pitch
.250 Pitch
.320 Pitch
Acme
Acme
Acme
Acme
Acme
Square
Worm Gear Ratios
25:1
25:1
25:1
25:1
25:1
32:1
Turns of Worm For 1˝ Raise
100
100
100
100
100
100
Torque at Full Load (in-lbs)
48
175
370
640
925
1500
Actuator Efficiency Rating (%)
13.2
9.1
8.6
7.5
6.9
5.3
Maximum H.P. Per Actuator
1/2
3/4
1 1/2
1 1/2
1 1/2
2 1/2
