John Crane A Series Manual

A##C & A##S
A SERIES ELASTOMERIC COUPLINGS
Fitting & Maintenance Instructions
1
Foreword
These instructions are provided to familiarize the user with the coupling and its designated use. These instructions must be read and applied whenever
work is carried out on the coupling and must be kept available for future reference.
ATTENTION These instructions are for the fitting, operation and maintenance of the coupling as used in rotating equipment and will help to avoid
danger and increase reliability. The information required may change with other types of equipment or installation arrangements. These
instructions must be read in conjunction with the instruction manuals for both the driver and driven machinery.
If the coupling is to be used for an application other than that originally intended or outside the recommended performance limits, John Crane must be
contacted before its installation and use.
Any warranty may be affected by improper handling, installation or use of this coupling. Contact the company for information as to exclusive product
warranty and limitations of liability.
If questions or problems arise, contact your local John Crane sales/service engineer or the original equipment manufacturer as appropriate.
ATTENTION John Crane couplings are precision products and must be handled appropriately. Take particular care to avoid damage to pilots, mating
faces, hub bores, keyways and insert.
These instructions are written for standard catalog products, generally designed in accordance with the drawing shown.
Safety Instructions
The following designations are used in the installation instructions to highlight instructions of particular importance.
IMPORTANT is used for items of particular concern when using the coupling.
ATTENTION where there is an obligation or prohibition concerning the avoidance of risk.
where there is an obligation or prohibition concerning harm to people or damage to the equipment.
0
90
180
EX1
X2
Z = X1-X2
Y
FIGURE 1A. Close-coupled Option A##C FIGURE 1B. Spacer Option A##S
0
90
180
EX1
X2
Z = X1-X2
Y
1– Flexible insert
2– Close-coupled hub
3– Retaining ring
4– Retainer set screw
5– Spacer (S option)
6– Hub (S option)
7– Stripper bolt (S option)

A##C & A##S
A SERIES ELASTOMERIC COUPLINGS
Fitting & Maintenance Instructions
2
Preparation
John Crane’s Powerstream couplings are available in many sizes and types. Check prior to any installation that the correct parts are on hand and as
ordered. Type A close-coupled couplings include two close-coupled hubs (with lug extensions), flexible insert, retaining ring and setscrews. Type A
spacer couplings include one close-coupled hub (with lug extensions), one hub (flanged), spacer, bolts with washers, flexible insert, retaining ring and
setscrews. Inspect all components and remove any protective coatings from the bores, etc. Remove any burrs or dirt from the shafts or bores.
Storage
If the coupling is not to be used immediately, it should be stored away from direct heat in its original packing. All documentation supplied with the
coupling should be retained for future reference.
Spares
When requesting spares, always quote the full designation of the coupling. The following spares can be purchased from John Crane:
• Flexible inserts (ref. 1) • Spacer (ref. 5)
• Retaining ring with setscrews (ref .3, 4) • Set of stripper bolts (ref. 7)
• Hubs, bored to your requirement or unbored (ref. 2, 6)
Installation
Remove coupling from packaging and carefully inspect for signs of damage. Pay particular attention to the hub bores and the pilot/recess location
features, which should be free from burrs and other damage.
Installation of hubs
Prior to installing the coupling, ensure that the machinery is made safe. Hubs must be adequately supported during
installation to avoid accidental damage should they slip.
1. Ensure the hub bore and mating shaft are clean.
2. Determine the fit required for your application (i.e. clearance or interference). The hubs are suitable for both interference and clearance fits. For
interference fits, we recommend heating the hubs in oil or an oven and quickly positioning on shafts (do not use spot heat or exceed 350˚F / 175˚C
as this may cause hub distortion). Shaft ends should be flush with the hub face at bottom of lug extensions unless longer or shorter than standard
distance between shaft ends (DBSE) is planned for. In which case, refer to drawing indicating the amount that the hubs should be mounted offset
from the shaft ends in order to obtain dimension E (see alignment).
3. Tighten setscrews when clearance fits are used or tighten screws when using intermediate bushings.
A Series close-coupled type C
• Fit the first close-coupled hub as above and slip the retaining ring (3) over the installed hub.
• Fit the second close-coupled hub.
A Series spacer type S
• Fit the first close-coupled hub as above and slip the retaining ring (3) over the installed hub.
• Fit the flanged hub (6). Shaft end should be flush with the hub face.
• Supporting the spacer (5), locate the spacer flange to the hub pilot and insert the stripper bolts (7)
and tighten evenly to the tightening torque in Table 1.
IMPORTANT Prior to installation of a second close-coupled hub or spacer, make sure the retaining ring is placed over the hub or shaft.
TABLE 1. Tightening Torque for Spacer Hub Stripper Bolts
Coupling Bolt Size Nm lb.ft Spanner A/F Allen Key (Hex. Socket)
A01S M8 19 14 13 mm -
A02S M8 19 14 13 mm -
A03S M10 54 40 - 8 mm
A04S M12 100 74 - 10 mm
A05S M12 100 74 - 10 mm
A06S M16 232 171 - 14 mm
FIGURE 2.
Retainer Ring Installation
0
90
180
EX1
X2
Z = X1-X2
Y
Retaining
Ring

A##C & A##S
A SERIES ELASTOMERIC COUPLINGS
Fitting & Maintenance Instructions
3
Shaft Alignment
Because the fitting of coupling components might require one machine to be moved, shaft alignment must be done during assembly of the coupling,
when indicated.
Align the center lines of the driving and driven machine shafts as follows:
• Move the equipment into position
• Check for any soft foot and correct before commencing alignment.
Your local John Crane representative can offer alignment equipment. Generally, shaft alignment should be within one quarter of the maximum allowable
misalignments specified in Table 2. The following procedures are an alternate method to obtain the alignment requirements.
Radial or offset
Align the shafts so that a straight edge rests squarely and parallel with the lugs on each close-coupled hub (or close-coupled hub and spacer). Check
with feeler gauges insuring that any clearance does not exceed the offset limits specified in Table 2.
Axial and angular
Using a spacer bar and feeler gauge, measure the clearance between the hubs at 0, 90, 180 and 270 degrees. The difference in measurements must not
exceed values given for angular tolerance below. The average of the readings should be within the between lugs dimension 'E' as specified in Table 2.
As a further check, at the minimum gap location, install the insert and check the clearance between the insert and the hub; it should be approximately
the axial value given in Table 2.
FIGURE 3A. Check For Axial Alignment FIGURE 3B. Check For Angular Alignment
Tighten foundation bolts and recheck alignment. Equipment should be doweled after alignment.
TABLE 2. Maximum Allowable Misalignment
A00C A01C
A01S
A02C
A02S
A03C
A03S
A04C
A04S
A05C
A05S
A06C
A06S A07C A08C
Between Lugs
(E)
mm 1.3 1.3 1.3 2.8 2.8 2.8 2.8 2.8 2.8
1.8 1.8 1.8 3.3 3.3 3.3 3.3 3.3 3.3
in 0.05 0.05 0.05 0.11 0.11 0.11 0.11 0.11 0.11
0.07 0.07 0.07 0.13 0.13 0.13 0.13 0.13 0.13
Axial mm 0.5 1.0 1.0 1.5 1.5 2.0 2.0 2.0 2.0
in 0.02 0.04 0.04 0.058 0.058 0.078 0.078 0.078 0.078
Offset (Y) mm 0.5 1.0 1.0 1.0 1.5 1.5 1.5 1.5 1.5
in 0.02 0.04 0.04 0.04 0.058 0.058 0.058 0.058 0.058
Angular (Z) mm 1.8 2.3 3.0 4.0 3.4 4.3 5.3 4.6 5.6
in 0.071 0.089 0.118 0.159 0.134 0.169 0.208 0.183 0.223
0
90
180
EX1
X2
Z = X1-X2
Y

Fitting & Maintenance Instructions
A##C & A##S
A SERIES ELASTOMERIC COUPLINGS
If the products featured will be used in a potentially dangerous and/or hazardous process, your John Crane representative should be consulted prior to
their selection and use. In the interest of continuous development, John Crane Companies reserve the right to alter designs and specifications without
prior notice. It is dangerous to smoke while handling products made from PTFE. Old and new PTFE products must not be incinerated. ISO 9001 and
ISO14001 Certified, details available on request.
©2017 John Crane Revised 10/17 www.johncrane.com IOM-ASeries
North America
United States of America
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Europe
United Kingdom
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Latin America
Brazil
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Middle East & Africa
United Arab Emirates
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Asia Pacific
Singapore
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4
TABLE 3. Steel Retaining Ring Screwset Sizes (Cup Point)
A00C A01C
A01S
A02C
A02S
A03C
A03S
A04C
A04S
A05C
A05S
A06C
A06S A07C A08C
Setscrew Size (mm) M5x5 M6x6 M8x10 M8x10 M8x10 M10x12 M10x12 M10x12 M10x12
Install the insert
Once the equipment is aligned, the insert can then be
installed. Align the lugs of each hub so they are facing one
another. Wrap the insert around the hubs, pressing the
insert into the space between the lugs. It may be necessary
to tap the insert into place.
Install the ring
Move the ring over the insert, ensuring the pins in the ring
are in line with the appropriate slots in the insert (through
slot for horizontal and half slot for vertical applications).
Tap gently into place with a soft-headed mallet until
the pins engage the center hole in each slot and tighten
setscrews (refer to Table 3 for correct size).
Disassembly
Loosen setscrews and remove the ring with a soft-headed
mallet, which prevents any damage to the ring.
The insert can now be easily removed and replaced.
Operation, Inspection and Maintenance
Before starting the machinery, ensure that all necessary safety procedures are being observed and coupling
guards are fitted.
Routine examination should include a periodic check on the tightness of fasteners and visual inspection of transmission components for signs
of fatigue or wear.
If the coupled machinery is disturbed at any time, shaft alignment should be rechecked. Alignment checking is recommended if a deterioration of
installation alignment during service is suspected.
Maintenance work must only be carried out by suitably qualified personnel when the equipment is stationary
and has been made safe.
Failures are rare and can generally be attributed to excessive misalignment and/or severe torsional overload. In all cases of coupling failure, the cause
should be identified and corrected before replacing the coupling.
It is possible to repair the coupling by fitting replacement inserts.
ATTENTION When repairing John Crane’s Powerstream couplings, only John Crane approved parts should be used.
0
90
180
EX1
X2
Z = X1-X2
Y
FIGURE 4. Install the Insert
0
90
180
EX1
X2
Z = X1-X2
Y
FIGURE 5B.
Install Retaining Ring Set Screw
0
90
180
EX1
X2
Z = X1-X2
Y
FIGURE 5A. Place Retaining Ring
0
90
180
EX1
X2
Z = X1-X2
Y
FIGURE 6.
Retaining Ring Disassembly