RINGFEDER TNM LG User manual

EN
08.2019
Elastomer Jaw Couplings
RINGFEDER® TNM LG
Installation and Operation Manual
Partner for Performance www.ringfeder.com

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Table of Contents
Chapter Page
1Notes on safety.................................................................................................................2
2Technical Description .......................................................................................................3
2.1 Intended Application..................................................................................................3
3Marking of the coupling.....................................................................................................3
4Storage.............................................................................................................................4
5Construction .....................................................................................................................4
6Technical Data..................................................................................................................5
7Installation ........................................................................................................................7
7.1 To be observed prior to installation............................................................................7
7.2 Finish Bores...............................................................................................................7
7.3 Coupling installation ..................................................................................................8
8Coupling Alignment.........................................................................................................10
8.1 Angular misalignment ∆Kw.......................................................................................11
8.2 Radial misalignment ∆Kr..........................................................................................11
8.3 Axial misalignment...................................................................................................12
9Operation........................................................................................................................13
9.1 Check of direction of rotation...................................................................................16
10 Maintenance ...................................................................................................................18
10.1 Wear inspection on the buffer ring...........................................................................18
10.2 Wear limit of the buffer ring .....................................................................................19
10.3 Replacement of the buffer ring ................................................................................19
11 Waste Disposal...............................................................................................................20
1 Notes on safety
The present assembly and operating instruction (AOI) constituents a part of the coupling
supply. Always keep the AOI near the coupling well accessible.
The German version of this manual is the predominant and binding version.
Make sure that all persons charged with the assembly, operating, service, and maintenance
have read and understood the AOI and follow all the points:
-Avert hazards for body and live of the user and third parties.
-Ensure the operating safety of the coupling.
-Avoid the loss of use and environmental impairment through false handling.
In the case of transport, mounting, dismounting and maintenance, attention is to be paid to
the relevant regulations for industrial safety and for environmental care.
The coupling may only be operated, mounted, serviced and maintained by authorised and
trained personnel.
The user must take into account that the bolting elements of coupling parts may be adversely
affected by the heat produced by a brake disk/ brake drum due to the resultant friction. Make
sure that the combination of the employed brake lining with the material of the brake disk/
brake drum does not lead to sparks or impermissible thermal growth. The brake disk is
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normally made of steel, and the brake disk is normallymade of cast iron with nodular graph-
ite. In case of any doubt, please consult the supplier!
In the interest of further development, we reserve the right to make changes which serve
technological progress.
By the use of accessories and spare parts, which were not originally manufactured by
RINGFEDER POWER TRANSMISSION, we are not responsible for any resulting damage
or liability or guarantee.
2 Technical Description
The RINGFEDER® TNM LG couplings are torsionally flexible, puncture proof claw couplings.
They compensate for angular, radial and axial shaft misalignments within defined limits. The
coupling transmits torque through elastic buffers loaded in compression. These buffers come
in Perbunan (Pb), and are connected to each other to form an intermediate buffer ring.
The buffer ring dampens shocks and torsional vibrations. It is resistant to oil and electrically
conductive.
One of the coupling halves consists of two parts which allows for the easy separation of the
coupled machines. The direction of rotation can be checked after having retracted the claw
ring. It is also possible to radially remove a coupling half. The buffer ring can be replaced
without having to displace the machines.
The coupling is suitable for use in both directions of rotation and any installation position.
2.1 Intended Application
•The coupling must only be operated in normal industrial atmospheres. Since aggressive
media may attack the coupling components, screws and elastic buffer rings, they repre-
sent a risk for the operational safety of the coupling. Consult RINGFEDER POWER
TRANSMISSION in such cases.
•In order to ensure trouble-free and reliable operation, the coupling has to be sized
according to the design specifications, e.g. according to DIN 740, part 2, (or acc. to
Product Paper & Tech Paper ”Elastomer Jaw Couplings“), with a service factor
appropriate for the service conditions.
•Except for the production of a finish bore with keyway (see 7.2 ‘Finish Bores’), no further
modifications are allowed to be carried out on the coupling.
•The coupling shall only be used and operated within the frame of the conditions as
defined in the performance or delivery contract.
•Any change in the operation conditions or service parameters requires the verification of
the coupling design.
3 Marking of the coupling
The product line RINGFEDER® TNM LG has its hardness in Shore (A) indicated on the
elastic intermediate ring.
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Fig. 1 Construction RINGFEDER® TNM LG
4 Storage
On receipt of the goods, the supply is to be checked immediately for completeness and
correctness. Possible damages incurred during transit and / or missing parts are to be
notified in writing.
The coupling parts can be stored in their delivered standard-state for 6 months in a dry,
roofed place at normal room temperature. For a longer storage duration a long-term preser-
vation is necessary (consult RINGFEDER POWER TRANSMISSION). The elastic
intermediate ring must not be subjected to ozone containing mediums, direct solar influence
or strong light sources with ultraviolet-light. The relative humidity must not exceed 65%. In
the case of proper storage the characteristics of the elastic intermediate ring remain
unchanged for almost up to three years.
5 Construction
Note:
The claw ring (part 3) and the flange hub (part 4) arrive bolted to each other.
Balanced parts are match-marked to each other.
1 Cheese head screw DIN 912
2 Lock washer
3 Claw ring, part 102
4 Flange hub, part 104
5 Elastic buffer ring, part 010
6 Coupling flange, part 130-155 (LG)
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6 Technical Data
Table 1 Technical Data:
Size
TNM
LG
TKnom.
Pb72
[Nm]
TKmax
Pb72
[Nm]
TKnom.
Pb82
[Nm]
TKmax
Pb82
[Nm]
nmax
[rpm]
82 48 100 75 150 8000
97 96 200 150 210 7000
112 150 310 230 540 6000
128 250 500 380 650 5000
148 390 800 600 1350 4500
168 630 1300 980 1800 4000
194 1050 2000 1650 2400 3500
214 1500 3100 2400 4200 3000
240 2400 4800 3700 6200 2750
265 3700 7500 5800 8300 2500
295 4900 10000 7550 10500 2250
330 6400 13000 9900 14500 2000
370 8900 18200 14000 20000 1750
415 13200 27000 20500 27000 1500
480 18000 36000 28000 66000 1400
575 27000 54000 41000 97500 1200
Table 2
Technical Data RINGFEDER® TNM LG
Size
TNM
LG
d1
max
[mm]
d2
[mm]
d3
[mm]
d4
[mm]
d5
[mm]
d6
h8
[mm]
d7
[mm]
z
num-
ber
l1
[mm]
l2
[mm]
lG
[mm]
L
[mm]
S1
[mm]
S2
[mm]
m
not bored
[kg]
82-120 32 40 44,5 108 82 120 6,6 6 16 8 40 68 3,0 12 1,8
97-144 39 50 54,5 128 97 144 9,0 6 20 10 49 83 3,0 14 2,9
112-158 46 60 64,5 142 112 158 9,0 6 22 10 58 95 3,5 15 4,4
128-180 53 70 74,5 160 128 180 11,0 6 25 13 68 109 3,5 16 6,7
148-200 65 90 92,5 180 148 200 11,0 7 28 13 78 124 3,5 18 9,8
168-220 75 100 104,5 200 168 220 11,0 8 34 13 87 142 3,5 21 14,0
194-248 85 115 121,5 224 194 248 13,5 8 38 16 97 159 3,5 24 21,0
214-274 95 130 135,5 250 214 274 13,5 8 42 16 107 175 4,0 26 27,9
240-314 100 145 146,0 282 240 314 17,5 8 45 20 117 192 4,0 30 37,6
265-344 115 160 164,0 312 265 344 17,5 8 50 20 137 220 5,5 33 53,4
295-380 130 170 181,0 348 295 380 17,5 9 52 22 147 236 8,0 37 70,2
330-430 135 200 208,0 390 330 430 22,0 9 56 25 156 252 8,0 40 91,7
370-480 160 235 241,0 440 370 480 22,0 10 62 25 176 281 8,0 43 126,0
415-575 180 270 275,0 528 415 575 26,0 10 65 30 196 306 8,0 45 183,9
480-615 190 320 289,0 568 480 615 26,0 10 65 30 220 330 8,0 45 244,7
575-692 260 400 368 645 575 692 26,0 10 65 30 240 350 8,0 45 370,1
Fig. 2 RINGFEDER® TNM LG
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The torques TKnom and TKmax. are valid for:
-buffer rings made from Perbunan Pb72 or Pb82,
-ambient temperatures of -40°C up to + 60°C,
-operation within the range of the specified alignment values.
For determining the size of the coupling according to DIN 740, part 2, (or to Product Paper &
Tech Paper ”Elastomer Jaw Couplings“) various factors have to be taken into account:
-the temperature factor Sυin case of higher temperatures,
-the start-up factor Sz depending on the frequency of starts,
-the shock factor SA, SLdepending on the service conditions.
For circumferential speeds above 22 m/s, we recommend to balance the coupling.
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7 Installation
7.1 To be observed prior to installation
• Danger of injuries!
• Disconnect the drive before carrying out any work on the coupling!
• Secure the drive against unintentional re-start and rotation!
• Incorrectly tightened bolts can cause serious personal injuries and
property damage!
• In compliance with accident prevention regulations, you are
obliged to protect all freely rotating parts by means of permanently
installed guards/ covers against unintentional contact and falling
objects.
• To avoid sparks, covers made of stainless steel must be used!
• As a minimum, the covers have to fulfill the requirements of
protection type IP2X.
•
The covers must be designed to prevent dust from depositing on
the coupling.
• The cover must not contact the coupling nor im
pair the function of
the coupling.
•Make sure that the speeds, torques and ambient temperatures as stated in
chapter 6 ‘Technical Data’ are not exceeded.
•The maximum permissible bore diameters must not be exceeded.
•Check whether the shaft-hub connections safely transmit the occurring operating
torques.
•The standard tolerance of RINGFEDER® TNM for finish bores is fit H7.
•Standard keyways comply with DIN 6885, sheet 1.
•Check the dimensions and tolerances of shafts, hub bores, keys and keyways.
•Set screws as required.
7.2 Finish Bores
The following procedure has to be observed to produce a finish bore in a coupling hub:
• Clean and remove all preservatives from the coupling hub.
• Mount the coupling hub between the surfaces marked with 

and carefully align the
coupling hub.
• The values for Ød1max listed in table 2, 3 and 4 are valid for keyed connections according
to DIN 6885/1 and must not be exceeded.
• Select the bore fit so that an interference fit such as H7/m6 results when mating it with the
shaft tolerance.
• Axially lock the hub, for example by means of a setscrew on the back of the hub above
the keyway
Contact RINGFEDER POWER TRANSMISSION if other shaft-hub connections are used.
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Fig. 4
• The stated maximum bore diameters are valid for keyed connec-
tions according to DIN 6885/1 and must not be exceeded.
• If these values are exceeded, the coupling can break.
• Flying coupling debris are a danger to life!
7.3 Coupling installation
• Remove the elastic buffer ring (Fig.
4, pos. 1).
• Prior to installation, carefully clean
the bore of the flange hub and the
shaft end. The surfaces must be
clean, dry and free of grease.
• For larger couplings use suitable
mounting tools and hoisting devices
such as cranes or pulley blocks.
• Mount the coupling hub in the proper
position on the shaft end (Fig. 4,
pos. 2).
Note:
To facilitate mounting, the hub can be heated to 80°C to 120°C. Take care for uniform
heating.
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Fig. 5
Fig. 6
 Warning!
 Always wear heat-resistant gloves to protect yourself against
injuries due to hot coupling components!
• Mount the hub in such a manner
that the shaft end is flush with the
inner bore opening (Fig. 5). Ob-
serve other mounting procedures
that may have been agreed upon
in that regard!
• When tightening setscrews, secure
them with an adhesive, such as
e.g. Loctite 222, to prevent the
screws from working loose or drop-
ping out.
• Mount the coupling flange to the
flange connection. Take care that
the parts do not become canted at
the centering seat (Fig. 4, pos. 2).
ATTENTION!
The contact surfaces of the coupling flange and flange connection must be clean, dry
and free of grease. Balanced parts are match-marked to each other.
ATTENTION!
Let the hot hub cool down to ambient temperature, before inserting the buffer ring.
• To facilitate mounting, the buffer
ring can be coated with a sliding
substance (e.g. talcum).
• Install the buffer ring in one of the
coupling halves.
• Push together the shaft end with
the mounted coupling half and the
coupling flange (Fig. 6).
• Align the coupling in accordance
with the instructions given in chap-
ter 8 'Coupling Alignment’.
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8 Coupling Alignment
 Danger of injuries!
 Disconnect the drive before carrying out any work on the
coupling.
 Secure the drive against unintentional re-start and rotating!
 Note:
 Precise alignment of the coupling increases the lifetime of the
intermediate buffer ring.
 It is of utmost importance to observe the recommended alignment
values. Exceeding the permissible misalignment values results in
coupling damages and failures!
• When aligning the cold equipment, take into account the expected thermal growth of the
components, so that the permissible misalignment values for the coupling are not
exceeded in operation.
• Be aware that the coupling under misalignment imposes restoring forces on the adjacent
shafts and bearings. Take into account that the larger the misalignment, the greater the
restoring forces will be.
• The maximum permissible misalignments stated in tables 5 to 7 are guiding values.
We recommend not to fully utilize these values when aligning the coupling, so as to have
sufficient reserves for thermal growth, foundation settlings etc. during operation.
• In special applications with high demands on quiet running characteristics or higher
speeds, alignment accuracies of ≤0.1 mm may be necessary for the three alignment
levels.
• If the coupling is mounted in a closed housing/ guard, so that alignment is no longer
possible at a later point of time, make sure that the geometry and the fitting accuracy of
the contact surfaces ensure true alignment of the shafts within the specified tolerances
during operation.
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8.1 Angular misalignment ∆
∆
∆
∆Kw
• Measure one complete revolution
(360°) on the face of the outer di-
ameter. Determine the largest devia-
tion ∆Kw1 and the smallest deviation
∆Kw2 (Fig. 7).
• Calculate the angular misalignment:
∆Kw= ∆Kw1 – ∆Kw2
• The values of table 5 are valid for a
reference speed of 1500 rpm.
Table 5 Maximum permissible angular misalignment values:
Size 82 97 112
128 148 168 194 214 240 265 295 330 370 415 480 575
∆Kw max [mm] 0,2 0,2 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3
8.2 Radial misalignment ∆
∆∆
∆Kr
• Measure one complete revolution
(360°) on the face of the outer di-
ameter. Determine the largest devia-
tion ∆Kr1 and the smallest deviation
∆Kr2 (Fig. 8).
• Calculate the radial misalignment
∆Kr= 0.5 x (∆Kr1 – ∆Kr2 ). Observe
the preceding sign of the measured
values.
• The values of table 6 are valid for a
reference speed of 1500 rpm.
Table 6 Maximal permissible radial misalignment values:
Size 82 97 112 128 148 168 194 214 240 265 295 330 370 415 480 575
∆Kr max [mm] 0,2 0,2 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3 0,3
Fig. 7
Fig. 8
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8.3Axial misalignment
• Measure the axial gap dimension as
shown in Fig. 9.
• During alignment, observe the gap
dimension S and the maximum
permissible tolerance X according to
table 7.
ATTENTION!
Contact RINGFEDER POWER
TRANSMISSION if larger axial
misalignments are expected to
occur during operation.
Table 7 Recommended axial misalignment values:
Size 82 97 112 128 148 168 194 214 240 265 295 330 370 415 480 575
S [mm] 3 3 3,5 3,5 3,5 3,5 3,5 4 4 5,5 8 8 8 8 8 8
X [mm] ±1 ±1 ±1 ±1 ±1 ±1,5 ±1,5 ±2 ±2 ±2,5 ±2,5 ±2,5 ±2,5 ±2,5 ±2,5 ±2,5
Fig. 9
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9 Operation
When operating the coupling, its specific technical data has to be carefully observed (see
chapter 6 ‘Technical Data’). These values must never be exceeded without the prior written
approval by RINGFEDER POWER TRANSMISSION.In order to ensure trouble-free and
reliable performance of the coupling, the coupling has to be designed according to the
selection specifications, e.g. according to DIN 740, part 2 (or acc. to Product Paper &
Tech Paper ”Elastomer Jaw Couplings“) with a service factor appropriate to the
service conditions. Any change in the service conditions or service parameters always
necessitates the verification of the coupling design.
 Danger of injuries!
 Disconnect the drive before carrying out any work on the cou-
pling!
 Secure the drive against unintentional re-start and rotation!
 Improperly tightened screws may cause parts to become flying
projectiles and lead to most serious personal injuries and property
damage!
 Before putting the coupling into operation, check the alignment
and all screwed connections for correct tightening torque and firm
fit!
 Before starting up the equipment, install all protective guards or
covers in order to avoid contact with freely moving or rotating
parts.
 To avoid sparks, covers made of stainless steel must be used!
 The covers have to comply with protection type IP2X as a mini-
mum.
 The covers must be designed to prevent dust from depositing on
the coupling parts.
 The covers must not contact the coupling nor impair its function.
When operating the coupling, pay attention to:
 Changes in operating noises
 Vibrations
Attention!
• Should you observe any unusual phenomena or problems when starting or operat-
ing the coupling, disconnect the driving equipment immediately!
• Identify the cause for the problem using table 8 below “Operation Faults and Possible
Causes“ and correct the fault.
The listed problems are some examples to assist you in troubleshooting.
• All the machinery components and operation modes have to be considered for the
determination and correction of mechanical problems!
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Table 8 Operation Faults and Possible Causes:
Trouble Cause Risk Warning Correction
Alignment fault Considerable
increase of coupling
temperature. Prema-
ture wear of elastic
buffers. Increased
reaction forces act on
connected machines.
-Disconnect drive
-Remove cause for alignment fault
-Re-align coupling
-Inspect elastic buffers for wear
Elastic buffers
worn out Coupling claws strike against each other.
Spark formation, claw
fracture, increased
reaction forces.
-Disconnect drive
-Check coupling components for
damages and replace parts, if nec-
essary
-Replace elastic buffers
Unbalance Considerable
increase in coupling
temperature. Prema-
ture wear of elastic
buffers. Increased
reaction forces act on
connected machines
-Disconnect drive
-Verify balance state of plant
components and correct it, if nec-
essary
-Inspect elastic buffers for wear
Irregular
running
noises/
vibrations
Loose screw
connections Flying parts can cause serious injuries
and considerable
damages.
-Disconnect drive
-Check coupling parts for damages,
replace parts, if necessary
-Verify alignment of coupling
-Tighten screws to the specified
tightening torque and secure them
against working loose, if necessary
-Inspect elastic buffers for wear
Alignment fault Considerable
increase in coupling
temperature. In-
creased reaction
forces act on con-
nected machines.
-Disconnect drive
-
Remove cause for alignment fault
-Re-align coupling
-Inspect elastic buffers for wear
Unacceptable
temperatures Material properties of elastic buffers
change. The torque
transmission capabil-
ity is adversely
affected.
-Disconnect drive
-Replace elastic buffers
-Re-align coupling
-Adjust ambient temperature
Premature
wear of
elastic
buffers
Contact with
aggressive
products
Material properties of
elastic buffers
change. The torque
transmission capabil-
ity is adversely
affected.
-Disconnect drive
-Check coupling parts for damages
and replace parts, if necessary
-Replace elastic buffers
-Verify alignment of coupling
-Prevent contact with aggressive
products
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Trouble Cause Risk Warning Correction
Torsional
vibrations in the
drive line
Considerable
increase in coupling
temperature. Prema-
ture wear of elastic
buffers. Increased
reaction forces act on
connected machines.
-Disconnect drive
-Analyse and eliminate cause for
torsional vibrations
-Check coupling parts for damages
and replace parts, if necessary
-Replace elastomer element and
consult RINGFEDER POWER
TRANSMISSION concerning the
use of another Shore-hardness
-Verify coupling alignment
Wear limit
of elastic
buffers
exceeded
===>
contact of
claws
Coupling is de-
stroyed. Connected
machines can also
be affected.
-Disconnect drive
-Replace coupling
-Inspect the elastic buffers for wear
at shorter intervals
Claw
breakage
Overload
due to too
high torque
Coupling is de-
stroyed. Connected
machines ca also be
affected.
-Disconnect drive
-Verify coupling design in coopera-
tion with RINGFEDER POWER
TRANSMISSION
-Replace coupling
-Install larger coupling, if necessary
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9.1 Check of direction of rotation
 Danger of injuries!
 Disconnect the drive before carrying out any work on the coupling!
 Secure the drive against unintentional re-start and rotation!
 Improperly tightened screws may cause parts to become flying
projectiles and lead to most serious personal injuries and property
damage!

Before putting the coupling into operation, check the alignment and
all screwed connections for correct tightening torque and firm fit!
 Before starting up the equipment, install all protective guards or
covers in order to avoid contact with freely moving or rotating
parts.
 To avoid sparks, covers made of stainless steel must be used!
 The covers have to comply with protection type IP2X as a mini-
mum.
 The covers must be designed to prevent dust from depositing on
the coupling parts.
 The covers must not touch the coupling nor impair its function.
• Attention!
• Checking the direction of rotation shall only be carried out while
the coupling flange is still in place at the driving machine! Other-
wise the risk of spark formation exists due to the retracted claw
ring!
• Remove the fastening screws at the
claw ring and push it away from the
buffer ring (Fig. 10, pos. 1).
• Secure the claw ring to prevent its
displacement.
• Cut through the buffer ring at one of
the connecting webs (Fig. 10, pos. 2).
• Pull out the buffer ring, starting from
the cut incision on the web.
• Attention!
• Make sure that the coupling halves cannot move axially while
checking the direction of rotation.
• The coupling half with the retracted claw ring must be stationary
when checking the direction of rotation.
• The rotating half must not contact the stationary half!
Fig. 10
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• After having checked the direction of rotation, cut through a new buffer ring at one of the
connecting webs and insert it between the coupling hub and the flange.
• To facilitate mounting, the new buffer ring can be coated with a sliding substance (e.g.
talcum).
Attention!
The contact surfaces of the claw ring and flange hub must be clean, dry and free of
grease. Balanced parts are match-marked to each other.
• Insert the claw ring in the marked
position relative to the hub. Pay at-
tention that the parts do not get
canted at the centering seat.
• Slightly tighten the screws in a
uniform manner.
• Tighten the claw ring screws to the
tightening torque MAspecified in
table 9 (Fig. 11).
• Check the alignment of the coupling
according to the instructions given in
chapter 8 ‘Coupling Alignment’.
Table 9 Tightening torques MAof the claw ring screws:
Size 82 97 112
128 148 168 194 214 240 265 295 330 370 415 480 575
DIN 912- 8.8 M6 M6 M8 M8 M10 M10 M10
DIN 912-10.9 M12 M12 M14 M14 M16 M16 M16 M20 M20
MA[Nm] 10 10 25 25 49 49 49 125 125 200 200 310 310 310 610 610
Fig. 11
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10 Maintenance
The RINGFEDER® TNM LG couplings only require little maintenance. The time at which the
wear limit of the elastic buffers is reached, depends on the service parameters and
application conditions.
On the occasion of routine inspections or maintenance of the equipment, check:
• alignment of the coupling,
• state of the elastomer element,
• and remove dust deposits from coupling parts and buffers.
10.1 Wear inspection on the buffer ring
 Danger of injuries!
 Disconnect the drive before carrying out any work on the coupling!
 Secure the drive against unintentional re-start and rotation!
Perform a visual inspection and a wear inspection of the buffer ring after
2000 operation hours, or after 3 months at latest, after the first start-up of
the equipment. If only minor wear or no wear is discovered, further inspec-
tions of the plant can be carried out at regular intervals of 4000 hours, but
have to be performed at least once a year, if the operating modes and
conditions of the plant remain unchanged. However, should excessive
wear already be observed on the occasion of the first inspection, check
whether the cause for the problem is listed in table 8 “Operation faults and
possible causes”. In such a case, the inspection intervals must be adapted
to the prevailing service conditions.
On the occasion of routine inspections or maintenance work on the drive equipment, or after
3 years at latest:
• Replace the elastic buffer ring.
• If the wear limit has been reached or exceeded, replace the buffer ring immediately,
irrespective of the inspection intervals of the equipment.
• Check the alignment of the coupling.
• Remove dust deposits from the coupling components and buffer ring.
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Fig. 12 Buffer thickness
10.2 Wear limit of the buffer ring
The buffer ring must be replaced immediately,
if the coupling has a distinct circumferential
backlash, or if the minimum buffer thickness
(PDmin, Fig. 12) acc. to table 10 has been
reached.
Table 10 Minimum buffer thickness PDmin:
Size 82 97 112 128 148 168 194 214 240 265 295 330 370 415 480
575
PDmin [
mm]
8 9 9 9 10 10 10 10 11 12 13 14 16 17 17 17
10.3 Replacement of the buffer ring
 Danger of injuries!
 Disconnect the drive before carrying out any work on the
coupling!
 Secure the drive against unintentional re-start and rotation!
• Remove the fastening screws at the
claw ring and push it away from the
buffer ring (Fig. 13, pos.1)
• Cut through the buffer ring at one of the
connecting webs (Fig. 13, pos. 2).
• Pull out the buffer ring, starting from the
cut incision on the web.
• To facilitate mounting, the new buffer
ring can be coated with a sliding sub-
stance (e.g. talcum).
• Cut through a new buffer ring at one of
the connecting webs and insert it be-
tween the coupling flange and the
flange hub. Fig. 13
RINGFEDER® TNM LG
BAWN 009-GBR-1

- 20 -
Attention!
The contact surfaces of the claw ring and flange hub must be clean, dry and free of
grease. Balanced parts are match-marked to each other.
• Insert the claw ring in the marked
position. Pay attention that the parts
do not get canted at the centering
seat.
• Slightly tighten the screws in a
uniform manner.
• Tighten the claw ring screws to the
tightening torque MAspecified in
table 11 (Fig. 14).
• Check the alignment of the coupling
according to the instructions given in
chapter 8 ‘Coupling Alignment“.
Table 11 Tightening torques MAof the claw ring screws:
Size 82 97 112 128 148 168 194 214 240 265 295 330 370 415 480 575
DIN 912- 8.8 M6 M6 M8 M8 M10 M10 M10
DIN 912-10.9 M12 M12 M14 M14 M16 M16 M16 M20 M20
MA[Nm] 10 10 25 25 49 49 49 125 125 200 200 310 310 310 610 610
Warning!
 Before starting up the equipment, install all the protective covers in
order to avoid contact with freely moving or rotating parts.
 To avoid sparks, covers made of stainless steel must be used!
 The covers have to comply with protection type IP2X as a mini-
mum.
 The covers must be designed to prevent dust from depositing on
the coupling parts.
 The covers must not touch the coupling nor impair its function.
We do not assume any liability or warranty for any damages resulting from the use of acces-
sories or parts which have not been originally manufactured by RINGFEDER POWER
TRANSMISSION.
11 Waste Disposal
The waste disposal has to occur according to the specific regulations of the respective user
country.
Fig. 14
RINGFEDER® TNM LG
BAWN 009-GBR-1