R II Gear Mar09

INSTALLATION MANUAL
GEAR-FLEX COUPLING
RATHI TRANSPOWER PVT. LTD.

PUNE - INDIA
R-II-G-04/00-03/09
Amendments
Doc No: R-II-G-04/00-03/09AMD

REV. 1
Date: 25th MARCH 2009
Sr.No. Description Old NO. Rev. NO. Nature of change Effective Date
1
R-II-G-04/00-03/09
TABLE OF CONTENTS
SR.No. Topics Page No

Product details
1 Before Installation 4
2 Mounting Procedure 4
3 Alignment Procedure 5
4 Permissible Misalignment 6
5 Grease quantity 7
R-II-G-04/00-03/09
GEAR - FLEX COUPLING INSTALLATION PROCEDURE
The performance and the life of the gear coupling depend on how you install and service
them.
(A) BEFORE INSTALLATION:-
1. Remove the coupling from packing & thoroughly inspect for signs of damage.
2. Disassemble the coupling by removing nuts & bolts. Clean all the parts carefully.
3. Remove protective coatings / lubricants from bores & keyways.
(B) MOUNTING PROCEDURE:-
1. Slide the sleeves with internal teeth with rubber O ring on shafts before mounting the
hubs.
2. Mount the hubs with external teeth on their respective shafts flushed with the faces of
hubs as shown in Fig. 1.
Fig. 1
3. With one machine firmly bolted down, set the equipments at a distance ‘G’ (refer table A
& B) between shaft ends by using a spacer bar equal in thickness to the required gap ‘G’ as
shown in Fig. 2.
Fig. 2
Deviation in standard DBSE is defined as axial misalignment (end float). For normal
applications the shaft end should be flushed with inner face of the adapter. In some special
cases the shaft ends may protrude beyond the inner face of the adapter or may remain
inside, if required. The distance between two faces of adapter flanges is to be maintained
as specified. The variation in this distance should not exceed the permissible initial axial
misalignment given in table A.
R-II-G-04/00-03/09
(C) ALIGNMENT PROCEDURE:-
Alignment procedure is given separately for each type of alignment, for simplicity. However
all 3 types of misalignments may be present at the same time.
IMPORTANT: The misalignment capabilities shown in drawings or in product literature are

for dynamic conditions and variations. For optimum service from the coupling the
installation misalignment (Initial misalignment) should not be more than 25% of the
maximum allowable misalignments limits. Allowance should be made for any anticipated
movements which will occur during operation (e.g. Thermal movements).
For Permissible INITIAL misalignments refer table A

For Permissible MAXIMUM misalignments refer table B
(I) CHECKING PARALLEL /RADIAL ALIGNMENT:-

Check the parallel/Radial alignment with the help of straight
edge resting squarely on both the hubs at 4 places 90° apart.
The deviation in the readings should not exceed the permissible
initial parallel misalignment mentioned in table A. (Refer Fig. 3)
Fig. 3
(II) CHECKING ANGULAR ALIGNMENT:-
Check the angular misalignment with the
help of slip gauges by inserting in the gap
at 4 places 90° apart. The deviation in the
values of standard gap ‘G’ is Total
Indicated Reading (TIR). The angular
misalignment ‘X’ in mm is half the Total
Indicated Reading. The values of angular
misalignment should not exceed
permissible initial misalignments
mentioned in table A. (Refer Fig. 4).
Fig. 4
(D). ASSEMBLY PROCEDURE:-
IMPORTANT: If the coupling is dynamically balanced, ensure that the match marks are in
straight line & unidirectional before bolting the assembly.
1. Insert the gasket between the flanges. Position the

flanged sleeves with lubrication plugs.
2. Insert the bolts & tighten the nuts.
Remember: Assemble only with the help of the fasteners
furnished with the coupling.
3. Fill with recommended grease/oil (RSG/RSL with reqd.
qty.) for lubrication. For grease quantity for respective
coupling size, refer table no. C.
4. Change the grease after the interval of 6 months & the
oil after the interval of 1 year or after 8000 working hours.
5. Use Loctite to prevent the loosening of threads, if required.
Fig. 5
IMPORTANT: The necessity for shields & guards varies with individual installations. The
owner or user must provide the required safety guards. Safety guards or shields are not
furnished by us with these equipments.
R-II-G-04/00-03/09
TABLE ‘A’
PERMISSIBLE INITIAL MISALIGNMENTS FOR GEAR COUPLINGS
TYPE RGD TYPE RGS

GAP
ANGULAR ANGULAR
COUPLING PARALLEL AXIAL AXIAL 'G'
SIZE DEG./ /RADIAL DEG./ STD.
‘X' X'
GEAR 'P' (mm) (mm) GEAR (mm) (mm)
(mm) (mm)
MESH MESH
10 0.3 0.2 0.2 3
15 0.4 0.2 0.2 3
20 0.5 0.3 ± 0.125 0.2 ± 0.125 3
25 0.6 0.3 0.3 5
30 0.7 0.4 0.3 5
35 0.8 0.4 ± 0.4 6
± 0.5º
40 0.9 0.5 0.125º 0.5 6
45 1 0.5 ± 0.25 0.5 ± 0.25 8
50 1.1 0.7 0.5 8
55 1.2 0.7 0.6 8
60 1.3 0.8 0.7 8
± 0.5 ± 0.5
70 1.5 0.9 0.8 10
TABLE ‘B’
PERMISSIBLE MAXIMUM MISALIGNMENTS FOR GEAR COUPLINGS
TYPE RGD TYPE RGS

GAP
ANGULAR ANGULAR
COUPLING PARALLEL AXIAL AXIAL 'G'
SIZE DEG./ /RADIAL DEG./ STD.
‘X' ‘X'
GEAR 'P' (mm) (mm) GEAR (mm) (mm)
(mm) (mm)
MESH MESH
10 1.1 0.6 0.6 3
15 1.4 0.8 0.7 3
20 1.8 1 ± 0.5 0.9 ± 0.5 3
25 2.2 1.2 1.1 5
30 2.6 1.4 1.3 5
35 3 1.7 1.5 6
± 2º ± 1º
40 3.6 2 1.8 6
45 4 2.1 ± 0.1 2 ±1 8
50 4.3 2.6 2.2 8
55 4.7 2.9 2.4 8
60 5.2 3.2 2.6 8
±2 ±2
70 6 3.7 3.1 10
Half Flexible Gear Couplings Type RGS cannot accommodate parallel misalignment. Gap ’G’ in
the above table is given when angular & axial misalignments are zero.
R-II-G-04/00-03/09
TABLE ‘C’
GREASE FOR GEAR COUPLING (RGD/RGS)
GREASE QTY. (Kg)

Sr. No. COUPLING SIZE
RGD RGS
1 10 0.03 0.015
2 15 0.06 0.030
3 20 0.17 0.085
4 25 0.23 0.115
5 30 0.34 0.170
6 35 0.45 0.225
7 40 0.79 0.395
8 45 1.08 0.540
9 50 1.89 0.945
10 55 1.93 0.965
11 60 3.46 1.730
12 70 6.35 3.175
RECOMMANDED GREASE – RATHI SPECIAL GREASE (RSG) (δg = 910 Kg/m3)
TABLE ‘D’
TIGHTENING TORQUE FOR GEAR COUPLING FLANGE BOLT (RGD/RGS)
FLANGE BOLT
Sr. No. COUPLING SIZE
TORQUE (Nm)
1 10 28
2 15 28
3 20 97
4 25 132
5 30 132
6 35 244
7 40 244
8 45 244
9 50 477
10 55 477
11 60 477
12 70 576
R-II-G-04/00-03/09

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INSTALLATION MANUAL

RATHI TRANSPOWER PVT. LTD.

Doc No: R-II-G-04/00-03/09AMD

SR.No. Topics Page No

(A) BEFORE INSTALLATION:-

3. Remove protective coatings / lubricants from bores & keyways.

(B) MOUNTING PROCEDURE:-

IMPORTANT: The misalignment capabilities shown in drawings or in product literature are

For Permissible INITIAL misalignments refer table A

(I) CHECKING PARALLEL /RADIAL ALIGNMENT:-

(D). ASSEMBLY PROCEDURE:-

1. Insert the gasket between the flanges. Position the

PERMISSIBLE INITIAL MISALIGNMENTS FOR GEAR COUPLINGS

TYPE RGD TYPE RGS

TYPE RGD TYPE RGS

GREASE FOR GEAR COUPLING (RGD/RGS)

GREASE QTY. (Kg)

RECOMMANDED GREASE – RATHI SPECIAL GREASE (RSG) (δg = 910 Kg/m3)

TIGHTENING TORQUE FOR GEAR COUPLING FLANGE BOLT (RGD/RGS)

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