20.88M

Dozator Orbital Motor

1.

Confidential Classification: C
Dozator-plus
Orbital Motors
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.

Dozator-plus Orbital Motors
Confidential Classification: C
List of tested hydraulic motors
Seal NAK
SCNW22 17*28*55
hydraulic motors
Д30.20
Pressure, Bar
Velocity,
rpm / speed,
m/s
45
(15 l) 630 /
Seal pressure
according to
recommendation
s NAK PV=45
80
32
SCN5W22
28,56*42*4,72
SCN5W22
28,56*42*4,72
Д09.50ПУ
5…21
0,56
930 / 1,4
Д06.40
7
1500, 1750 /
20 / 17
SCNW22 35*48*5,5
Д11.80-01
2…3, до 5
2,24; 2,61
300раб, 750 /
80 / 32
До 16
До 10
0,56; 1,37
240 / 0,44
582, 742/
SCNW22 35*48*5,5
SCNW22 45*65*7,6
Д07.315-01
Д12.SL.200
SCN5W22 28.56*42*4.72
SCNW22 35*48*5.5
SCN5W22 28,56*42*4.72
SCNW22 35*48*5.5
102
32 / 25
SCNW22 45*65*7.6
1,37; 1,75
SCNW22 17*28*55
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
2

3.

Dozator-plus Orbital Motors
Confidential Classification: C
List of tested hydraulic motors
Seal NAK
SCNW22 17*28*55
hydraulic motors
Д30.20
Pressure, Bar
Velocity,
rpm / speed,
m/s
45
(15 l) 630 /
Seal pressure
according to
recommendation
s NAK PV=45
80
32
SCN5W22
28,56*42*4,72
SCN5W22
28,56*42*4,72
Д09.50ПУ
5…21
0,56
930 / 1,4
Д06.40
7
1500, 1750 /
20 / 17
SCNW22 35*48*5,5
Д11.80-01
2…3, до 5
2,24; 2,61
300раб, 750 /
80 / 32
До 16
До 10
0,56; 1,37
240 / 0,44
582, 742/
102
32 / 25
SCNW22 35*48*5,5
SCNW22 45*65*7,6
Д07.315-01
Д12.SL.200
SCN5W22 28.56*42*4.72
SCN5W22 28,56*42*4.72
1,37; 1,75
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
3

4.

Confidential Classification: C
Orbital Motor Test
SCN5W22 28.56*42*4.72
DANFOSS-OMP
Pressure
Bar
Speed
RPM
Linear
Velocity
m/s
PV
Oil
Temp
°C
15
770
1.15
17.3
40
21
937
1.4
29.4
40
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
4

5.

Confidential Classification: C
Orbital Motor Test
SCN5W22 28.56*42*4.72
There are currently four types of rubber compounds being shipped. Which specific product was tested?
NAK P/N
Specifications
Drw #
100120053260000
SCNW22 28.56*39.5*5.5 NK801B/C/E///
44891-1A
100120056620000
SCNW22 28.56*42*5.5 HKB02/C/E///
29702-1A
100120088620000
SCNW22 28.56*42*5.5 NK901N/C/E///
29702-1A
100120089790000
SCNW22 28.56*39*4.8 NK901N/C/E///
49631-1A
100120089830000
SCNW22 28.56*42*5.5 NK801B/C/C///
29702-1A
100120089840000
SCNW22 28.56*48*6 NK801B/C/C///
29962-1A
100120090350000
SCNW22 28.56*48*6 NK901N/C/C///
29962-1A
100120096600000
100120099670000
SCN5W22 28.56*42*5.5 HKA11/C/E///
SCNW22 28.56*42*5.5 HKB02/C/E///
75929-1A
77841-1A
Order Type Year 2020 Year 2021 Year 2022 Year 2023 Year 2024 Year 2025 Year 2026
Prod.
500
Stock
180
240
Sample
60
Prod.
1,000
Stock
208
Prod.
500
3,500
Stock
180
294
40
Prod.
500
500
2,000
Stock
40
18
Prod.
500
Prod.
500
Stock
20
100
40
Prod.
10,000
Sample
60
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
Total
500
420
60
1,000
208
4,000
514
3,000
58
500
500
160
10,000
60
5

6.

Confidential Classification: C
Orbital Motor Test
SCN5W22 28.56*42*4.72
NAK Actual cycloidal motor test
Oil seal specifications: SCN5W22 33.3*46*4.2 HKA11
Test conditions:
Time
hrs
Pressure
Bar
Speed
RPM
Linear Velocity
m/s
PV
Oil Temp
°C
3
15
660
1.15
17.3
60
Under the same testing conditions of linear speed, pressure, and PV value,
we did not observe the smoking issue mentioned by the customer.
Test results: No scorching, smoke, or leakage (see test video).
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
6

7.

Dozator-plus Orbital Motors
Confidential Classification: C
List of tested hydraulic motors
Seal NAK
hydraulic motors
Pressure, Bar
Velocity,
rpm / speed,
m/s
SCNW22 17*28*55
Д30.20
45
(15 l) 630 /
Seal pressure
according to
recommendation
s NAK PV=45
80
32
SCN5W22
28,56*42*4,72
SCN5W22
28,56*42*4,72
Д09.50ПУ
5…21
0,56
930 / 1,4
Д06.40
7
1500, 1750 /
20 / 17
SCNW22 35*48*5,5
Д11.80-01
2…3, до 5
2,24; 2,61
300раб, 750 /
80 / 32
До 16
До 10
0,56; 1,37
240 / 0,44
582, 742/
102
32 / 25
SCNW22 35*48*5,5
SCNW22 45*65*7,6
Д07.315-01
Д12.SL.200
1,37; 1,75
SCNW22 17*28*55
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
7

8.

Confidential Classification: C
Orbital Motor Test
SCN5W22 17*28*5.5
NAK P/N
100120089820000
100120089820000
Specifications
SCNW22 17*28*5.5 NK901N/C/E///
SCNW22 17*28*5.5 NK901N/C/E///
Drw #
Order Type
16824-1B
Prod.
16824-1B
Stock
Chamfered corners should
be polished to remove
burrs.
Schematic diagram
Assembly problems:
1.
What is the assembly method for inserting the seal into the housing bore? Is a hydraulic
Interference between R-angle and oil
seal guide angle
press used ?
2.
It is recommended to pre-lubricate both the bore and the outer diameter of the seal before
assembly.
3.
It is recommended that the bore chamfer be polished and free of any burrs.
4.
What is the size of the R radius? Is there any risk of interference between the R radius and
the seal? Please refer to the attached illustration.
R-angle ?
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
8

9.

Confidential Classification: C
Orbital Motor Test
SCN5W22 17*28*5.5
NAK P/N
100120089820000
100120089820000
Specifications
SCNW22 17*28*5.5 NK901N/C/E///
SCNW22 17*28*5.5 NK901N/C/E///
Drw #
Order Type
16824-1B
Prod.
16824-1B
Stock
DANFOSS-OMM
Test Questions:
SCN5W22 17*28*5.5
Speed
RPM
Linear Velocity
m/s
Pressure
Bar
PV
630
0.56
45
25.2
Please provide the tested sample for analysis.
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
9

10.

11.

Confidential Classification: C
Q&A
2.
Why is it that when calculating PV at 1500 rpm, the permissible pressure is 20
bar, and in recommendations above 800 rpm, the pressure is 5 bar? And at 10
bar in the recommendation, the seal should melt. Why ?
For testing-related issues, please refer to page 4.
SCN5W22 28.56*42*4.72
Speed
RPM
Linear Velocity
m/s
Pressure
Bar
PV
1500
2.24
20
45
800
1.20
37.5
45
800
1.20
10
12
DANFOSS-OMP
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
11

12.

Confidential Classification: C
Q&A
3.
Which seals can be guaranteed to work at a speed of more than 2 m/sec and a
pressure of 10 bar ?
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
12

13.

Confidential Classification: C
Q&A
4.
Our temperature range is -20 +90°C working fluid, and -30 +90°C environment.
What type of seal and what brand of material should I use ? (NBR, HNBR, FKM)
Temperature range of general rubber compounds:
SCN5W22 Rubber material recommendations HK906: -35 ~ 150 °C
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
13

14.

Confidential Classification: C
Q&A
5.
Given the roughness of the shaft surface Ra 0.2...0.4, which finishing is
preferable: grinding or polishing ?
Machining Method Requirements
The included angle of the machining marks (Lead angle) must not exceed 0.05°
(Reference standard: ARPM OS-1-1)
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
14

15.

Confidential Classification: C
Q&A
6.
Reliable dust covers are needed. Please recommend it. How can I check the
anther's performance ?
Dust Seal Design
Dust Seal Test
Bore
Shaft
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
15

16.

Confidential Classification: C
Q&A
7.
What is the resource of cuffs ?
Not sure what should we reply for this question,
please provide more details for our team.
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
16

17.

Confidential Classification: C
Q&A
8.
What is the permissible misalignment of the shaft and the fit in the lid? What is
the permissible runout of the shaft? Any seal has a misalignment of the sealing
edge relative to the outer diameter. What is the misalignment of the NAK seals
and how to compensate for it?
Off-set
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
Run-out
17

18.

Confidential Classification: C
Q&A
9.
We put a cuff on 17*28*5,5 for testing. When installed in the lid, the seal was
pressed very tightly. 0.25 mm did not reach the end, part of the rubber was
squeezed out after pressing (photo attached). The nest and pressing were carried
out according to the recommendations, i.e. H8 fit, roughness Ra 0.2 - 0.3
microns, entrance chamfer. The seal was pressed in without lubrication. Then the
working edge was lubricated with the recommended lubricant. What could be the
reason for the rubber squeezing ?
Same as Page 5
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
18

19.

Confidential Classification: C
Q&A
10. The same seal was tested 17*28*5,5 under the conditions under which it
operates on the machine: 630 rpm, pressure 45 bar. (According to calculations,
the linear velocity is 0.56 m/s, the permissible pressure depending on PV = 45 is
up to 80 bar). She worked at the stand at a pressure of 45 bar. The control check
time is 16 hours. A leak was detected on the seal. What could be the cause of the
leak ?
Please send the tested sample back to us for analysis of the cause of failure.
SCN5W22 17*28*5.5
Speed
RPM
Linear Velocity
m/s
Pressure
Bar
PV
630
0.56
45
25.2
DANFOSS-OMM
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
19

20.

Confidential Classification: C
Q&A
11. The seal 28,56*42*4,72 it was installed by pre-lubricating the outer diameter of
the seal and the groove with oil (working fluid). The seal was pressed with
medium force and reached the end of the groove with its rubber protrusion. There
is no rubber extrusion. Do I need to pre-lubricate the seal before pressing? Due
to the presence of this protrusion, the metal frame of the seal does not come into
contact with the body (0.03 mm gap). Is this the norm or is it necessary to ensure
the contact of the metal frame of the cuff with the body of the hydraulic motor ?
In addition to applying grease to the sealing lip, it is recommended to pre-lubricate
both the housing bore and the outer diameter of the seal before installation.
If the seal does not fully fit against the bore after assembly, one possible cause
may be interference between the seal chamfer and the inner R radius of the bore.
Interference between R-angle and oil
seal guide angle
Schematic diagram
Copyright © 2026 NAK Sealing Technologies Corporation. All rights reserved.
20

21.

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