Instruction Manual

5. Concrete foundation
If a concrete foundation is used, allow the concrete to set
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concrete, to adequately distribute the load stress onto the
concrete foundation.
Figure 1: Concrete Foundation
6. Bolt connections for footed & flange mounted units
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torque reaction capacity whatever the mounting arrange-
ment. Tightening torque for gear reducer mounting bolts,
and recommended fastener grades, are provided in Table 2.
Table 2A: Tightening Torque for Inch Reducer Mounting Bolts
Thread
Size
Tightening Torque
Grade SAE 5 /
ASTM A449
Grade SAE 8
(in) (lb-in) (lb-ft) (Nm) (lb-in) (lb-ft) (Nm)
1/4-20 85 7.1 9.6 120 10.0 13.6
5/16-18 190 16 21 267 22 30
3/8-16 330 28 37 470 39 53
1/2-13 825 69 93 1,170 98 132
5/8-11 1,660 138 188 2,340 195 264
3/4-10 2,960 247 334 4,180 348 472
7/8-9 4,750 396 537 6,700 558 757
1-8 7,100 592 802 10,000 833 1,130
1 1/8-7 -
- -
14,800 1,233 1,672
1 1/4-7
- - -
20,600 1,717 2,327
1 3/8-6
- - -
27,200 2,267 3,073
1 1/2-6
- - -
35,800 2,983 4,045
1 3/4-5
- - -
53,500 4,458 6,045
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60°, clean and dry (un-lubricated) thread, with thread-
friction and head-friction equal to 0.15.
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Table 2B: Tightening Torque for Metric Reducer Mounting Bolts
Above Tightening Torque
ISO Grade 8.8 ISO Grade 10.9
(mm) (lb-in) (lb-ft) (Nm) (lb-in) (lb-ft) (Nm)
. 28 2.4 3.2 42 3.5 4.7
. 57 4.7 6.4 82 6.9 9.3
. 97 8 11 142 12 16
. 239 20 27 345 29 39
. 469 39 53 690 58 78
. 814 68 92 1,195 100 135
. 1,283 107 145 1,903 159 215
. 2,036 170 230 2,965 247 335
. 2,036 170 230 2,965 247 335
. 4,071 339 460 5,841 487 660
. 5,576 465 630 7,966 664 900
. 6,992 583 790 10,178 848 1,150
. 10,178 848 1,150 14,604 1,217 1,650
. 14,161 1,180 1,600 19,914 1,660 2,250
. 24,605 2,050 2,780 34,606 2,884 3,910
. 39,563 3,297 4,470 55,671 4,639 6,290
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60°, clean and dry (un-lubricated) thread, with thread-
friction and head-friction equal to 0.15.
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minimum ISO Grade 8.8 bolt.
7. Mounting the prime mover
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to the gearbox, it is important to properly secure and
align the gear drive with respect to the driven machine
before attempting to align the prime mover or motor.
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place, align the prime mover with respect to the reducer
input shaft.
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and secure in place with the proper mounting bolts. Dowel
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and ensure proper realignment if removed for service.
IMPORTANT NOTE
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the prime mover and the reducer, check alignment
per the coupling manufacturers recommendations. If
the coupling is misaligned, the reducer alignment or
shimming is incorrect. Re-align the gear reducer and
re-check the high-speed coupling alignment before re-
aligning the motor.
DRIVESYSTEMS
UNIT INSTALLATION
RETAIN FOR FUTURE USE
U10060 - 2 of 2
! Grouted Structural
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# Concrete Foundation
www.nord.com/docs06.09.09
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