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During installation

2016/11/5      view:
 

•Lifting the slewing bearing, put it on the support, check the contact area. fill the clearance with casting resin grouting or steel thinner plate to avoid deformation when fastened.

•Use the quenching and tempering flat washers for bolts.

•Use a properly calibrated torque wrench or hydraulic tensioner.

•The preload of the bolts must be sufficient, that is 0.7 times of the yield strength of bolts.

Spring washers absolutely prohibited

•After delicate calculation according to the load, type and the number of the bolts, we recommend the actual pretorque or pretightening force of the bolts as follows:

5pecificaion
(GB5782-86
GB5783-86)

diameter of mounting holes(mm)

grade ( GB30981-82 )

8. 8

10. 9

12.9

intensity limiting of the bolts            ( N/mm2)

640

900                                             1080

pretorque MA ( Nm )

M10

11

44

62

75

M12

13.5

77.5

110

130

M14

15.5

120

170

210

M16

18

190

265

320

M18

20

260

365

435

M2q

22

370

520

620

M22

24

500

700

840

M24

26

640

900

1080

M27

30

950

1350

1620

M30

33

1300

1800

2160

pretightening force FA ( 103N )

M33

36

293

412

495

M36

39

344

484

581

M39

42

414

581

698

M42

45

473

665

798

M45

48

553

777

932

M48

52

623

876

1050

M52

56

749

1054

1265

M56

62

863

1214

1457

M60

66

1008

1418

1621

--MA=0.9 Msp (admissible tightening torque)

--FA=0.9 Fsp (admissible clamping force)

--When bolts dimension doesn't accord to the standard GB5782 or GB5783, the values should be calculated separately.

--The friction factor between the nuts and the tightened flat is 0.14. Grease the screw with a little oil.

--The clamping length of the bolts: LK .---5d(d: diameter of the bolts)

--GB3098.2-82 defines the nut's grade, which can be a grade lower than the bolts.

--Before final tightening, check the gear; make sure the backlash between the meshing gear ring (three teeth marked green) is up to the standard of gear.

--Tightening the bolts should follow the description according to the drawing.

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