KTR-Group BoWex-ELASTIC HEW-ZS Manual

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
1 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
BoWex-ELASTIC®
highly flexible flange coupling types
HEW, HEW Compact and their combinations
according to directive 2014/34/EU
Type HEW1
Type HEW2
Type HEW-ZS
Type HEW Compact

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
2 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
BoWex-ELASTIC®HEW is a highly flexible plug-in shaft coupling. It dampens torsional vibrations,
reduces shocks and insulates structure-borne noise.
The BoWex-ELASTIC®HEW coupling compensates for relatively large shaft displacements, for
example caused by inaccuracies in production, thermal expansion etc.
1Technical data 3
2Advice 7
2.1 General advice 7
2.2 Safety and advice symbols 7
2.3 General hazard warnings 7
2.4 Intended use 8
2.5 Coupling selection 8
2.6 Reference to EC Machinery Directive 2006/42/EC 8
3Storage, transport and packaging 9
3.1 Storage 9
3.2 Transport and packaging 9
4Assembly 9
4.1 Components of the couplings 9
4.2 Advice for finish bore 11
4.3 Assembly of the coupling 12
4.4 Displacements - alignment of the couplings 13
5Start-up 16
6Breakdowns, causes and elimination 17
7Disposal 18
8Spares inventory, customer service addresses 18
9Enclosure A
Advice and instructions regarding the use in potentially explosive atmospheres 19
9.1 Intended use in potentially explosive atmospheres 19
9.2 Inspection intervals for couplings in potentially explosive atmospheres 20
9.3 Inspection of torsional backlash 21
9.4 Standard values of wear 22
9.5 marking of coupling for potentially explosive atmospheres 23
9.6 EU Certificate of conformity 24
Table of contents

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
3 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
BoWex-ELASTIC®type HEW1 and HEW2
Illustration 1: BoWex-ELASTIC®type HEW1
Illustration 2: BoWex-ELASTIC®type HEW2
Table 1: Dimensions - type HEW1 and HEW2
Size
Max. finish bore
[mm]
Dimensions [mm]
d2
d3
D
D2
z x M
D4
D5
D6
l1
l2
42
48
50
68
162
6
M6
146
180
85
50
45
48
48
55
68
180
8
M6
164
200
92
50
45
65
65
75
96
224
8
M8
205
245
125
70
55
80
80
80
124
295.27
8
M10
266
318
130
90
70
G 80
85
95
124
333.4
8
M10
302
358
145
90
80
100
100
110
152
438.15
8
M12
350
478
158
110
80
125
125
125
192
438.15
16
M12
416
478
175
140
99
G 125
125
125
192
489
8
M12
440
530
175
140
95
150
160
160
225
542.9
6
M16
470
585
225
150
100
G 150
160
160
225
542.9
6
M16
504
585
225
150
108
200
180
200
250
641.35
12
M16
568
683
280
175
149
G 200
180
200
200
250
12
M16
600
683
280
175
149
Size
Dimensions [mm]
Weight with
max. bore
[kg]
Mass moment of
inertia [kgm2]
l3
l4
l5
E
E1
LHEW1
LHEW2
JA
JL
42
15
50
42
4
32
132
104
4.3
0.0121
0.0015
48
17
55
45
4
32
137
109
5.5
0.0204
0.0019
65
28
75
63
5
42
187
150
13.2
0.0752
0.0071
80
17
80
70
5
45
215
160
19.7
0.1449
0.0285
G 80
22
90
78
5
55
235
185
25.9
0.2748
0.0422
100
14
111.5
113
26
57
278
207
48.5
0.8356
0.1050
125
14
170
158
-
45
327
-
67.2
0.9498
0.2617
G 125
14
170
158
-
45
327
-
76.6
1.4492
0.3034
150
18
150
145
-
70
380
-
110
2.7206
0.5303
G 150
18
150
145
-
70
380
113.4
2.7809
0.5861
200
26
220
214
-
85
480
195
6.6418
1.1406
G 200
26
220
214
-
85
480
200
6.6099
1.3419
1 Technical data

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
4 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
BoWex-ELASTIC®type HEW1 and HEW2
Table 2: Torques - type HEW1 and HEW2
Size
Elastomer
hardness
[Shore A]
Torque [Nm]
Size
Elastomer
hardness
[Shore A]
Torque [Nm]
TKN
TK max.
TKN
TK max.
42
40 / T40
130
390
125
40 / T40
3000
9000
50 / T50
150
450
50 / T50
4000
12000
65 / T65
180
540
65 / T65
5000
15000
48
40 / T40
200
600
G 125
40 / T40
4000
12000
50 / T50
230
690
50 / T50
5200
16000
65 / T65
280
840
65 / T65
6500
20000
65
40 / T40
350
1050
150
T40
5500
16500
50 / T50
400
1200
T50
7000
21000
65 / T65
500
1500
T65
9000
27000
80
40 / T40
750
2250
G 150
T40
7000
21000
50 / T50
950
2850
T50
9200
27600
65 / T65
1200
3600
T65
11500
34500
G 80
40 / T40
1250
3750
200
T40
9500
28500
50 / T50
1600
4800
T50
12500
37500
65 / T65
2000
6000
T65
16000
48000
100
40 / T40
2000
6000
G 200
T40
11500
34500
50 / T50
2500
7500
T50
15000
45000
65 / T65
3200
9600
T65
19500
58500
1 Technical data

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
5 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
BoWex-ELASTIC®type HEW Compact
Illustration 3: BoWex-ELASTIC®type HEW1 Compact
Illustration 4: BoWex-ELASTIC®type HEW2 Compact
Table 3: Dimensions - type HEW Compact
Size
Max. finish bore
[mm]
Dimensions [mm]
Weight
with pilot
bored
coupling
[kg]
Mass moment of
inertia with pilot
bored coupling
[kgm2]
d1
d2
D1
D2
D3
D4
l1
l2
l3
l4
E
L
L1
z
M
J1
J2
42-130
42
42
90
65
78
131
42
42
45
37
34
118
98
6
M6
3.4
0.003
0.001
65-180
65
65
130
96
110
180
60
55
55
47
30
145
122
8
M10
9.0
0.014
0.006
80-225
75
80
145
124
120
225
70
90
77
51
50
210
158
10
M12
18.9
0.035
0.029
100-305
100
100
200
152
175
305
90
110
90
73
58
258
187
16
M12
40.2
0.152
0.087
125-365
125
125
235
192
205
365
120
140
150
90
68
328
240
12
M16
75.0
0.36
0.26
Table 4: Technical data - HEW Compact
Size
Elastomer
hardness
[Shore A]
Torque
Perm.
operating
speed nmax.
[rpm]
Perm. damping
power PKW [W]
Cdyn. bei
60 °C
[Nm/rad]
Relative
damping 
Resonance
factor
VR2 /
Radial
spring
stiffness Cr
[N/mm]
TKN
[Nm]
TK max.
[Nm]
TKW
[Nm]
60
°C
80
°C
90
°C
42
T50
200
400
50
7300
24
12
6
780
0.6
10.5
178
T65
270
540
68
2400
0.8
7.9
600
T70
320
640
80
2900
1.2
5.2
710
65
T50
550
1100
138
5500
48
24
12
2850
0.6
10.5
379
T65
740
1500
185
7800
0.8
7.9
955
T70
860
1700
215
9500
1.2
5.2
1240
80
T50
1250
2500
313
4400
96
48
24
5000
0.6
10.5
420
T65
1600
3200
400
13000
0.8
7.9
1090
T70
1900
3800
475
16500
1.2
5.2
1450
100
T50
2750
5500
688
3200
156
78
39
17000
0.6
10.5
760
T65
3900
7800
975
44000
0.8
7.9
1850
T70
4500
9000
1125
50000
1.2
5.2
2250
125
T40
5500
11000
1375
2900
192
96
48
15000
0.6
10.5
476
T50
7500
15000
1875
25000
0.8
7.9
750
T65
8400
16800
2100
62000
1.2
5.2
1930
1 Technical data

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
6 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
BoWex-ELASTIC®type HEW-ZS
Illustration 5: BoWex-ELASTIC®type HEW-ZS (size 48 to G 80)
Illustration 6: BoWex-ELASTIC®type HEW-ZS (size 100 to G 125)
Table 5: Dimensions - type HEW-ZS 1)
Size
Max. finish bore
[mm]
Dimensions [mm]
d3
d4
D2
z x M
D4
D5
D6
D7
D8
l1
l2
l3
48
55
28
180
8
M6
164
200
92
78
45
50
45
17
65
75
45
224
8
M8
205
245
125
110
72
55
55
28
80
80
65
295.27
8
M10
266
318
130
145
100
90
70
17
G 80
95
65
333.4
8
M10
302
358
145
145
100
90
80
22
100
110
90
438.15
8
M12
350
478
158
180
135
80
80
16
125
125
120
438.15
16
M12
416
478
175
225
180
80
99
18
G 125
125
120
489
8
M12
440
530
175
225
180
80
95
15
Size
Dimensions [mm]
Spacer HEW-ZS
LZ[mm]
Weight
with max.
bore [kg]
Mass moment of
inertia [kgm2]
l4
l5
l6
100
120
140
180
250
JA
JL
48
55
45
45
⚫
⚫
6.9
0.0203
0.0050
65
75
63
56
⚫
⚫
16.0
0.0747
0.0160
80
80
70
75
⚫
⚫
25.5
0.1447
0.0699
G 80
90
78
75
⚫
⚫
34.2
0.2752
0.1412
100
111.5
110
76
⚫
⚫
54.0
0.8459
0.0992
125
170
171
76
⚫
⚫
84.2
1.1814
0.3017
G 125
170
157
76
⚫
⚫
93.5
1.6853
0.3690
1) Torques of BoWex-ELASTIC®type HEW-ZS see table 2.
BoWex-ELASTIC®couplings with attachments that can generate heat, sparks and static
charging (e. g. combinations with brake drums, brake disks, overload systems such as torque
limiters, fan impellers etc.) are not permitted for the use in potentially explosive atmospheres.
A separate analysis must be performed.
1 Technical data

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
7 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Please read through these operating/assembly instructions carefully before you start up the coupling.
Please pay special attention to the safety instructions!
The BoWex-ELASTIC®coupling is suitable and approved for the use in potentially explosive
atmospheres. When using the coupling in potentially explosive atmospheres, observe the special
advice and instructions regarding safety in enclosure A.
The operating/assembly instructions are part of your product. Please store them carefully and close to the
coupling. The copyright for these operating/assembly instructions remains with KTR.
Warning of potentially explosive
atmospheres
This symbol indicates notes which may contribute to
preventing bodily injuries or serious bodily injuries that
may result in death caused by explosion.
STOP
Warning of personal injury
This symbol indicates notes which may contribute to
preventing bodily injuries or serious bodily injuries that
may result in death.
!
Warning of product damages
This symbol indicates notes which may contribute to
preventing material or machine damage.

General advice
This symbol indicates notes which may contribute to
preventing adverse results or conditions.
Warning of hot surfaces
This symbol indicates notes which may contribute to
preventing burns with hot surfaces resulting in light to
serious bodily injuries.
STOP
With assembly, operation and maintenance of the coupling it has to be made sure that the
entire drive train is secured against accidental switch-on. You may be seriously hurt by
rotating parts. Please make absolutely sure to read through and observe the following
safety indications.
•All operations on and with the coupling have to be performed taking into account "safety first".
•Please make sure to switch off the power pack before you perform your work on the coupling.
•Secure the power pack against accidental switch-on, e. g. by providing warning signs at the place of switch-on
or removing the fuse for current supply.
•Do not reach into the operating area of the coupling as long as it is in operation.
•Please secure the coupling against accidental contact. Please provide for the necessary protection devices
and covers.
2 Advice
2.1 General advice
2.2 Safety and advice symbols
2.3 General hazard warnings

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
8 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
You may only assemble, operate and maintain the coupling if you
•have carefully read through the operating/assembly instructions and understood them
•are technically qualified and specifically trained (e. g. safety, environment, logistics)
•are authorized by your company
The coupling may only be used in accordance with the technical data (see chapter 1). Unauthorized modifications
on the coupling design are not admissible. We will not assume liability for any damage that may arise. In the
interest of further development we reserve the right for technical modifications.
The BoWex-ELASTIC®type HEW, HEW Compact and HEW-ZS described in here corresponds to the technical
status at the time of printing of these operating/assembly instructions.
!
For a long-lasting and failure-free operation of the coupling it must be selected according to
the selection instructions (according to DIN 740 part 2) for the particular application (see
catalogue drive technology "BoWex-ELASTIC®").
If the operating conditions (performance, speed, modifications on engine and machine)
change, the coupling selection must be reviewed.
Please make sure that the technical data regarding torque refer to the elastomer part only.
The transmittable torque of the shaft-hub-connection must be reviewed by the customer and
is subject to his responsibility.
For drives subject to torsional vibrations (drives with cyclic stress due to torsional vibrations) it is necessary to
perform a torsional vibration calculation to ensure a reliable selection. Typical drives subject to torsional vibrations
are e. g. drives with diesel engines, piston pumps, piston compressors etc. If requested, KTR will perform the
coupling selection and the torsional vibration calculation.
The couplings supplied by KTR should be considered as components, not machines or partly completed
machines according to EC Machinery Directive 2006/42/EC. Consequently KTR does not have to issue a
declaration of incorporation. For details about safe assembly, start-up and safe operation refer to the present
operating/assembly instructions considering the warnings.
2 Advice
2.4 Intended use
2.5 Coupling selection
2.6 Reference to EC Machinery Directive 2006/42/EC

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
9 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
The coupling hubs are supplied in preserved condition and can be stored at a dry and roofed place for 6 - 9
months.
With favourable storage conditions the properties of the elastomer part remain unchanged up to 5 years.
!
The storage rooms must not include any ozone-generating devices like e. g. fluorescent
light sources, mercury-vapour lamps or electrical high-voltage appliances.
Humid storage rooms are not suitable.
Please make sure that condensation is not generated. The best relative air humidity is less
than 65 %.
!
In order to avoid any injuries and any kind of damage always make use of proper transport
and lifting equipment.
The couplings are packed differently each depending on size, number and kind of transport. Unless otherwise
contractually agreed, packaging will follow the in-house packaging specifications of KTR.
The coupling is generally supplied in individual parts. Before assembly the coupling has to be inspected for
completeness.
Components of BoWex-ELASTIC®type HEW1 and HEW2
Component
Number
Description
1
1
Elastomer part
2
1
Hub
4
1
Coupling flange
5
see table 1 1)
Cap screw DIN EN ISO 4762 1)
7
2
Setscrew DIN EN ISO 4029
1) With size 150 nuts as per DIN EN ISO 4014 are required additionally.
Illustration 7: BoWex-ELASTIC®type HEW1
Illustration 8: BoWex-ELASTIC®type HEW2
3 Storage, transport and packaging
3.1 Storage
3.2 Transport and packaging
4 Assembly
4.1 Components of the couplings

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
10 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Components of BoWex-ELASTIC®type HEW Compact
Component
Number
Description
1
1
Elastomer part
2
1
Hub
4
1
Coupling flange
5
see table 3
Cap screw DIN EN ISO 4762
7
2
Setscrew DIN EN ISO 4029
Illustration 9: BoWex-ELASTIC®type HEW Compact
Components of BoWex-ELASTIC®type HEW-ZS
Component
Number
Description
1
1
Elastomer part
2
1
Hub spec.
3
1
Intermediate flange hub
4
1
Coupling flange
4.1
1
Additional flange
4.2
1
Flange hub
4.3
see table 5
Cap screw DIN EN ISO 4762
5
see table 1
Cap screw DIN EN ISO 4762
6
see table 5
Cap screw DIN EN ISO 4762
7
2
Setscrew DIN EN ISO 4029
Illustration 10: BoWex-ELASTIC®type HEW-ZS (size 48 to G 80)
Illustration 11: BoWex-ELASTIC®type HEW-ZS (size 100 to G 125)
Table 6: Cap screws DIN EN ISO 4762
Size
48
65
80
G 80
100
125
G 125
Number z (component 4.3)
-
-
-
-
15
12
12
Number z (component 6)
8
12
12
12
12
12
12
4 Assembly
4.1 Components of the couplings

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
11 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
STOP
The maximum permissible bore diameters d (see chapter 1
- technical data) must not be exceeded. If these figures are
disregarded, the coupling may tear. Rotating particles may
cause danger to life.
•Bores on the hubs/coupling flange machined by the
customer have to observe concentricity or axial runout
(see illustration 12).
•Please make absolutely sure to observe the figures for
Ø dmax.
•Carefully align the hub or coupling flange when the finish
bores are drilled.
•Please provide for a setscrew according to
DIN EN ISO 4029 with a cup point or an end plate to fasten
the hub or coupling flange axially.
Illustration 12: Concentricity and axial
run-out
!
The customer bears the sole responsibility for all machining processes performed
subsequently on unbored or pilot bored as well as finish machined coupling components
and spare parts. KTR does not assume any warranty claims resulting from insufficient
remachining.
KTR supplies unbored or pilot bored coupling components and spare parts only upon
explicit request of the customer. These parts are additionally marked with the symbol
.
Reference to unbored resp. pilot bored coupling components with explosion protection
marking:
Basically the company KTR supplies couplings resp. coupling hubs with explosion protection
marking as an unbored or pilot bored type only on explicit request of the customer. The prerequisite
is a declaration of exemption submitted by the customer assuming any responsibility and liability for
remachining performed properly.
Table 7: Setscrew DIN EN ISO 4029
Size
42
48
65
80
G 80
100
125
G 125
150
G150
200
G 200
Thread size
M8
M8
M10
M10
M10
M12
M16
M16
M16
M16
M20
M20
Tightening torque TA
[Nm]
10
10
17
17
17
40
80
80
80
80
140
140
Table 8: Recommended fit pairs acc. to DIN 748-1
Bore [mm]
Shaft tolerance
Bore tolerance
above
up to
50
k6
H7
(KTR standard)
50
m6
If a feather keyway is intended to be used in the hub, it should correspond to the tolerance ISO JS9 (KTR
standard) with standard operating conditions or ISO P9 with complicated operating conditions (frequently
alternating torsional direction, shock loads, etc.).
The transmittable torque of the shaft-hub-connection must be reviewed by the customer and is subject to his
responsibility.
4 Assembly
4.2 Advice for finish bore

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
12 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:

We recommend to inspect bores, shaft, keyway and feather key for dimensional accuracy
before assembly.
Heating the hubs lightly (approx. 80 °C) allows for an easier mounting on the shaft.
Please pay attention to the ignition risk in potentially explosive atmospheres!
STOP
Touching the heated hubs causes burns.
Please wear safety gloves.
!
With the assembly make sure that the distance dimension E (see table 1 and 3) is observed
to allow for axial clearance of the sleeve while being in operation.
Disregarding this advice may cause damage to the coupling.
!
With the assembly please make sure that the spline of the hub is fully covered by the
internal spline of the elastomer. (Please observe mounting dimensions L, LHEW1, LHEW2 or
LHEW - ZS.)
Disregarding this advice may cause damage to the coupling.
If used in potentially explosive atmospheres the setscrews to fasten the hubs as well as all
screw connections must be secured against working loose additionally, e. g. conglutinating
with Loctite (average strength).
•Valid for type HEW-ZS only (size 100 to G 125):
Screw the flange hub (component 4.2) with the additional flange (component 4.1) at the tightening torques TA
specified in table 9.
Table 9: Cap screws DIN EN ISO 4762
Size
100
125
G 125
Tightening torque TA
[Nm]
355
355
355
•Mount the hub, the flange hub with additional flange or the coupling flange onto the shaft of the driving and
driven side.
•Shift the power packs in axial direction until the mounting dimension L, LHEW1, LHEW2 or. LHEW-ZS has been
achieved.
•If the power packs have already been firmly assembled, shifting the hub, the flange hub or the coupling flange
or coupling flange axially on the shafts allows for adjusting the mounting dimension.
•Fasten the hub, the flange hub or the coupling flange by tightening the setscrews DIN EN ISO 4029 with a cup
point (tightening torques see table 7).
•Valid for type HEW-ZS only:
Mount the hub spec. (component 2) in front of the intermediate shaft hub (component 3) and screw the
components at the tightening torques TAspecified in table 10.
Table 10: Cap screws DIN EN ISO 4762
Size
48
65
80
G 80
100
125
G 125
Tightening torque TA
[Nm]
41
69
120
120
190
295
295
4 Assembly
4.3 Assembly of the coupling

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
13 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Valid for type HEW only:
Mount the elastomer part (component 1) in front of the coupling flange (component 4) and screw the components
at the tightening torques TAspecified in table 11.
Table 11: Cap screws DIN EN ISO 4762
Size
42
48
65
80
G 80
100
125
G 125
150
G 150
200
G 200
Tightening torque TA
[Nm]
14
14
35
69
69
120
120
120
295
295
410
410
•Position the elastomer part (component 1) in front of the flange hub with additional flange or coupling flange.
•Hand-tighten the components first. Afterwards tighten the screws at the tightening torque TAspecified in
table 11.
Valid for type HEW Compact only:
Mount the coupling flange (component 4) in front of the elastomer part (component 1) and screw the components
at the tightening torques TAspecified in table 12.
Table 12: Cap screws DIN EN ISO 4762
Size
42
65
80
100
125
Tightening torque TA
[Nm]
14
69
120
120
250
If used in potentially explosive atmospheres the setscrews to fasten the hubs as well as all
screw connections must be secured against working loose additionally, e. g. conglutinating
with Loctite (average strength).
!
Please observe the manufacturer’s instructions regarding the use of adhesives.
Do not apply glue on the rubber surfaces.
The BoWex-ELASTIC®HEW couplings accept a position deviation of the machine parts to be connected up to
the data specified in table 13
With alignment, the radial and angular displacement should be kept as small as possible, because the service life
is increased in this way if the operating conditions are otherwise maintained.
The BoWex-ELASTIC®HEW coupling has to be aligned from the coupling hub on the shaft side towards one of
the machined surfaces of the flange hub.
!
In order to ensure a long service life of the coupling and avoid dangers with the use in
potentially explosive atmospheres, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures specified (see table 11).
If the figures are exceeded, the coupling will be damaged.
The more accurate the alignment of the coupling, the longer is its service life.
4 Assembly
4.3 Assembly of the coupling
4.4 Displacements - alignment of the couplings

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
14 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Please note:
•The displacement figures specified in tables 13 and 14 are maximum figures which must not arise in parallel.
If radial and angular displacements arise at the same time, the permissible displacement values may only be
used proportionally (see illustration 14).
•The displacement figures specified are general standard figures that apply up to an ambient temperature of
80 °C, ensuring a sufficient service life of the BoWex-ELASTIC®coupling.
Displacement figures between the speeds specified have to be interpolated accordingly. If necessary, ask
about the displacement for the corresponding coupling type.
•Please inspect with a dial gauge, ruler or feeler whether the permissible displacement figures of tables 13 and
14 can be observed.
Radial displacement
Angular displacement
Axial displacement
Illustration 13: Displacements
Examples of the displacement
combinations specified in illustration 14:
Example 1:
Kr= 30 %
Kw= 70 %
Example 2:
Kr= 60 %
Kw= 40 %
Illustration 14:
Combinations of
displacement
Ktotal = Kr+ Kw100 %
4 Assembly
4.4 Displacements - alignment of the couplings

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
15 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Table 13: Displacement figures - type HEW and HEW-ZS
Displacement figures
Elastomer
hardness
[Shore A]
Size
42 HE
48 HE
65 HE
80 HE
100 HE
125 HE
150 HE
200 HE
G 65 HE
G 80 HE
G 125 HE
G 150 HE
G 200 HE
Perm. radial displacement
with n = 1500 rpm
Kr[mm]
40 3)
1.1
1.2
1.6
1.8
2.2
2.5
2.8
3.0
50 3)
1.0
1.1
1.5
1.7
2.0
2.3
2.5
2.7
65 2) 3)
0.5
0.5
0.7
0.8
1.0
1.1
1.3
1.5
Perm. radial displacement
with n = 3000 rpm
Kr[mm]
40 3)
0.8
1.1
1.4
1.6
2.0
2.2
2.5
2.8
50 3)
0.7
1.0
1.3
1.5
1.8
2.0
2.2
2.5
65 2) 3)
0.4
0.4
0.5
0.6
0.8
0.8
1.0
1.2
Max. radial displacement
Kr[mm] 1)
40 3)
3.6
3.8
5.1
5.7
6.5
7.5
8.0
8.5
50 3)
3.3
3.5
4.7
5.3
6.0
6.9
7.5
8.0
65 2) 3)
1.5
1.7
2.2
2.4
3.0
3.3
4.0
4.5
Perm. angular
displacement with
n = 1500 rpm
Kw[degree]
40 3)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
50 3)
0.75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
65 2) 3)
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Perm. angular
displacement with
n = 3000 rpm
Kw[degree]
40 3)
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
50 3)
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
65 2) 3)
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
Max. angular
displacement Kw
[degree] 1)
40 / 50 / 65 2) 3)
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Perm. axial displacement
Ka[mm]
40 / 50 / 65 2) 3)
±2
±2
±2
±2
±3
±3
±5
±5
1) For short-term start-up operation
2) With size 125 = 70 ShA
3) Applies for compound T as well
Table 14: Displacement figures - type HEW Compact
Displacement figures
Size
42-130
65-180
80-225
100-305
125-365
Elastomer hardness
[Shore A]
T50
T65
T70
T50
T65
T70
T50
T65
T70
T50
T65
T70
T40
T52
T65
Max. axial displacement
Ka[mm]
± 2
± 2
± 2
± 2
± 2
Max. radial displacement
with n = 1500 rpm
Kr[mm]
±1.1
±1
±0.5
±1.6
±1.5
±0.7
±1.8
±1.7
±2.2
±2.2
±2
±1
±2.5
±2.3
±1.1
Max. radial displacement
with n = 3000 rpm
Kr[mm]
±0.55
±0.5
±0.25
±0.8
±0.75
±0.35
±0.9
±0.85
±1.1
±1.1
±1
±0.5
±1.25
±1.15
±0.55
Max. angular
displacement with
n=1500 rpm
Kw[degree]
±1
±0.75
±0.5
±1
±0.75
±0.5
±1
±0.75
±1
±1
±0.75
±0.5
±1
±0.75
±0.5
Max. angular
displacement with
n = 3000 rpm
Kw[degree]
±0.5
±0.4
±0.25
±0.5
±0.4
±0.25
±0.5
±0.4
±0.5
±0.5
±0.25
±0.25
±0.5
±0.4
±0.25
4 Assembly
4.4 Displacements - alignment of the couplings

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
16 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Before start-up of the coupling, inspect the tightening of the setscrews in the hubs, the alignment and the distance
dimension L, LHEW1, LHEW2 or LHEW-ZS and adjust, if necessary, and also inspect all screw connections for the
tightening torques specified.
If used in potentially explosive atmospheres the setscrews to fasten the hubs as well as all
screw connections must be secured against working loose additionally, e. g. conglutinating
with Loctite (average strength).
Finally the coupling protection against accidental contact must be fitted. It is required in accordance with
DIN EN ISO 12100 (Safety of Machinery) and directive 2014/14/EU and must protect against
•access with the little finger
•falling down of solid foreign objects.
The cover may provide for openings intended for necessary heat dissipation. These openings have to comply with
DIN EN ISO 13857.
The cover must be electrically conductive and included in the equipotential bonding. Bellhousings (magnesium
share below 7.5 %) made of aluminium and damping rings (NBR) can be used as connecting element between
pump and electric motor. The cover may only be taken off with standstill of the unit.
For covers with unlocked openings on the top face no light metals must be used if the
couplings are used as equipment of equipment group ll (if possible, from stainless steel).
During operation of the coupling, please pay attention to
•different operating noise
•vibrations occurring.
!
If you note any irregularities with the coupling during operation, the drive unit must be
switched off immediately. The cause of the breakdown must be specified by means of the
table „Breakdowns“ and, if possible, be eliminated according to the proposals. The potential
breakdowns specified can be hints only. To find out the cause all operating factors and
machine components must be considered.
Coating of coupling:
If coated (priming, paintings, etc.) couplings are used in potentially explosive atmospheres,
the requirements on conductibility and coating thickness must be considered. With
paintings up to 200 µm electrostatic load does not have to be expected. Paintings and
coatings exceeding a thickness of 200 µm are generally impermissible for potentially
explosive atmospheres. It also applies for multiple coatings exceeding an overall thickness
of 200 µm. Make sure with painting or coating that the coupling components are
conductively connected with the device/devices to be connected so that the equipotential
bonding is not impeded by the paint or coat applied. In addition, make sure that the marking
of the coupling remains legible. Painting or coating of the elastomer part is generally not
admitted.
5 Start-up

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
17 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
The below-mentioned failures can result in a use of the BoWex-ELASTIC®coupling other than intended. In
addition to the specifications given in these operating/assembly instructions make sure to avoid such failures.
The errors listed can only be clues to search for the failures. When searching for the failure the adjacent
components must generally be considered.
If used other than intended the coupling can become a source of ignition.
EU directive 2014/34/EU requires special care by the manufacturer and the user.
General failures with use other than intended:
•Important data for the coupling selection are not forwarded.
•The calculation of the shaft-hub-connection is not considered.
•Coupling components with damage occurred during transport are assembled.
•If the heated hubs are assembled, the permissible temperature is exceeded.
•The clearance of the components to be assembled is not coordinated with one another.
•Tightening torques have been fallen below/exceeded.
•Components are mixed up by mistake/assembled incorrectly.
•No original KTR components (purchased parts) are used.
•Old/already worn out elastomer parts or those stored for too long are used.
•Maintenance intervals are not observed.
Breakdowns
Causes
Hazard notes for
potentially explosive
atmospheres
Elimination
Different operating
noise and/or vibrations
occuring
Micro friction by faulty
alignment on the spline
of the elastomer part
Danger of ignition due to
hot surfaces
1) Set the unit out of operation
2) Eliminate the reason for the misalignment
(e. g. loose foundation bolts, breaking of the
engine mount, heat expansion of unit
components, modification of the installation
dimension E of the coupling)
3) For inspection of wear see chapter 9.2
Screws for axial
fastening of hubs
working loose
1) Set the unit out of operation
2) Inspect alignment of coupling
3) Tighten the screws to fasten the hubs and
secure against working loose
4) For inspection of wear see chapter 9.2
Fracture of elastomer
part/spline
Fracture of elastomer
part/spline caused by
high dynamic
energy/overload
none
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the elastomer part
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert elastomer part, assemble coupling
components
5) Find out the reason for overload
Operating parameters
do not meet with the
performance of the
coupling
1) Set the unit out of operation
2) Review the operating parameters and select a
bigger coupling (consider mounting space)
3) Assemble new coupling size
4) Inspect alignment
Operating error of the
unit
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the elastomer part
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert elastomer part, assemble coupling
components
5) Instruct and train the service staff
6 Breakdowns, causes and elimination

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
18 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Breakdowns
Causes
Hazard notes for
potentially explosive
atmospheres
Elimination
Excessive wear on the
spline of the elastomer
part, fracture of
elastomer
Vibrations of drive
Danger of ignition due to
hot surfaces
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the elastomer part
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert elastomer part, assemble coupling
components
5) Inspect alignment, adjust if necessary
6) Find out the reason for vibrations
ambient/contact
temperatures which are
too high for the
elastomer part,
max. permissible
-30 °C/+80 °C
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the elastomer part
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert elastomer part, assemble coupling
components
5) Inspect alignment, adjust if necessary
6) Inspect and adjust ambient/contact
temperature
e. g. contact with
aggressive liquids/oils,
influence by ozone, too
high ambient
temperature etc.
causing a physical
change of the elastomer
part
none
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the elastomer part
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert elastomer part, assemble coupling
components
5) Inspect alignment, adjust if necessary
6) Make sure that other physical modifications of
the elastomer part are excluded
!
When operating with a worn elastomer part (see chapter 9.3 and 9.4) proper operation is not
ensured.
In respect of environmental protection we would ask you to dispose of the packaging or products on termination of
their service life in accordance with the legal regulations and standards that apply, respectively.
•Metal
Any metal components have to be cleaned and disposed of by scrap metal.
•Nylon materials
Nylon materials have to be collected and disposed of by a waste disposal company.
We recommend to store major spare parts on site to ensure the readiness for use of the machine in case if a
coupling fails.
Contact addresses of the KTR partners for spare parts and orders can be obtained from the KTR homepage at
www.ktr.com.

KTR does not assume any liability or warranty for the use of spare parts and accessories
which are not provided by KTR and for the damages which may incur as a result.
6 Breakdowns, causes and elimination
7 Disposal
8 Spares inventory, customer service addresses

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
19 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
9 Enclosure A
Advice and instructions regarding the use in potentially explosive atmospheres
Types available:
HEW and HEW Compact
Conditions of operation in potentially explosive atmospheres
BoWex-ELASTIC®couplings are suitable for the use according to EU directive 2014/34/EU.
Industry (with the exception of mining)
•Equipment group II of category 2 and 3 (coupling is not approved/not suitable for equipment group 1)
•Substance group G (gases, fogs, vapours), zone 1 and 2 (coupling is not approved/not suitable for zone 0)
•Substance group D (dusts), zone 21 and 22 (coupling is not approved/not suitable for zone 20)
•Explosion group IIB (gases, fogs, vapours) (explosion group IIA is included in IIB) and
explosion group IIIC (dusts) (explosion group IIIA and IIIB are included in IIIC)
Temperature class:
Temperature class
Ambient or operating temperature Ta1)
Max. surface temperature 2)
T4
-30 °C to +80 °C
+115 °C
T5
-30 °C to +60 °C
+95 °C
T6
-30 °C to +45 °C
+80 °C
Explanation:
The maximum surface temperatures each result from the maximum permissible ambient or operating temperature Taplus the maximum
temperature increase T of 35 K to be considered. For the temperature class a safety margin subject to standard of 5 K is added.
1) The ambient or operating temperature Tais limited to +80 °C due to the permissible permanent operating temperature of the
BoWex-ELASTIC®elastomer parts used.
2) The maximum surface temperature of +115 °C applies for the use in locations which are potentially subject to dust explosion.
In potentially explosive atmospheres
•the ignition temperature of dusts generated must at least be 1.5 times the surface temperature to be
considered
•the glow temperature must at least be the surface temperature to be considered plus a safety distance of 75 K.
•the gases and vapours generated must amount to the temperature class specified.
9.1 Intended use in potentially explosive atmospheres

BoWex-ELASTIC®
Operating/Assembly instructions
Type HEW, HEW Compact and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
20 of 24
9
Please observe protection
note ISO 16016.
Drawn:
2019-11-06 Pz
Replacing:
KTR-N dated 2019-08-13
Verified:
2019-11-06 Pz
Replaced by:
Equipment category
Inspection intervals
2G
2D
Gases and vapours of
explosion group IIA and IIB
The torsional backlash of the coupling (see chapter 9.3 and 9.4) according to
directive 2014/34/EU only has to be inspected if a failure of the coupling and
consequently a standstill of the drive causes explosion hazard.
We recommend a preventive inspection of torsional backlash and a visual
inspection of the elastomer part. This should be performed after 1,000 operating
hours for the first time, at the latest 6 months after start-up of the coupling.
If you note insignificant or no wear on the elastomer part upon this initial
inspection, further inspections can each be performed after 2,000 operating hours
or at the latest after 18 months, provided that the operating parameters remain
the same.
If you note significant wear with the initial inspection so that it would be advisable
to replace the elastomer part, please find out the cause according to the table
„Breakdowns“, if possible.
The maintenance intervals must be adjusted to the modified operating
parameters without fail.
BoWex-ELASTIC®
Illustration 15: BoWex-ELASTIC®(example: type HEW1)
Here the backlash between the hub and
the nylon spline must be inspected via
torsional backlash, each separately from
the driving and the driven side.
The friction/wear may only be Xmax. of the
original spline thickness before the
elastomer part must be replaced.
When reaching the torsional backlash
Smax., the elastomer part must be
replaced immediately, irrespective of the
inspection intervals.
Visual inspection of the elastomer part
(cracks, holes or anything similar).
9 Enclosure A
Advice and instructions regarding the use in potentially explosive atmospheres
9.2 Inspection intervals for couplings in potentially explosive atmospheres