Installation of Bearing
Slewing Bearing Installation and Maintenanc
Anti-rust,packing,transportationAnti-rust,packing
Slewing bearing painted by anti-rust oil and lubrication inside&outside,packed by film,brown paper,plasticknit bag,if have special demand,can personalized packing according to the demand.
Transportation
Bearings place while transportation,allow to place bearings a bit inclination avoid hit and rain.Iftransportingbearingswithout packing by wooden cases,more than three wooden cushion blocks shall be used to separatethe product from thevehicle floor and place it flat.After opening the package,use the transport bolts to screw the hole of inner ring or oute ring,hang up the bearings on level to the mounting place,the angle between the 2 slings is not more than 120°, so as not todamage the slewing bearing and ensure safety (Picture1-1)
Storage
1)Anti-rust period(within 12 months after bearing ex-factory),if need maintenance,should have anti-rust treatment to theraceway,surface, gear surface,clear the surface and paint anti rust grease or industrial Vaseline fil No.2 pole lithium greasein inner raceway.
2)Place the slewing bearing on level at dry and plain site to prohibit the slewing bearing contact the ground under directsunlight,keep far away from water pipe,steam pipe to avoid bearings corrosion,if many slewingbearings pile up together,each slewing bearing place at least 3 equal wo oden mats around circle position,the position upand down show be the same(Picture 2-1).
3) If the slewing bearing storage over 12 months,should anti-rust again.
Notice before mounting
1)Before unpacking the bearing,please check product certificate,product type,serial number,make sure to received the sameproducts with the contract order.
2)Product type label on the non-gear face outer dia of outer ring or inner dia of inner ring.
3)Quench on surface of bearing raceway are not closed,gquench connection is soft zone on bearing side face that marks"S"asnon-quench area.
4) MMake sure to received products without corrosion,wound,damage.
5)Make sure that sealing no damage otherwise exchange seals,check bearing rotation .
6)Clear the surface grease of mounting bearing,cleanser can not come into bearing raceway while clearing.
7) Forbid to disassemble bearings,move inner parts privately. Gear ring tooth surface has 3 max runout with green mark,drive pinionside backlash must be adjusted.
Bracket requirements before mounting
Slewing bearing mounting base level or mount platform must be clean without sundries,broken bits protruding point andCorros1on.
Mounting bracket must be with rigidity,intensity and impact resistance to avoid bearing distortion that infuences slewingprecision.
A doping canister shape welding bracket to avoid bracket distortion,after welding to treat remove inner stress,treatmentthe mechanize, you can see Drawings 51 A. For theuneasy to mechanize mounting plane,can level up to mount( Picture 4-1B)
Bracket bolt hole is identical to the slewing bearing mounting hole to avoid mount distortion(Picture 4-1C).
Slewing bearing contacting surface skills as 5-1 table, in 0°-90°-180 loop area,only allow a wave crest up to thevalue,other warp allows down or up sten by step,not allowed down or up suddenly to avoid peak value load.(Picture 4-3)
Table4-2:P0 slewing bearing supporting parts connectiong
Raceway dia(mm) | Plane degree | Circle border upon unit(L=1 bore distance) Same direction lean(S-t)mm | Circle border upon unit(L=1 bore distance) Same direction lean(S-t)mm | Radial width b leanō(mm) | side-face roughness Ra(mm) |
630~1000 | 0.2 | 0.0002L | 0.0002L | 0.10 | 2.5 |
1000~1600 | 0.25 | 0.0002L | 0.0002L | 0.12 | 3.2 |
1600~2500 | 0.3 | 0.0002L | 0.0002L | 0.15 | 3.2 |
2500~4000 | 0.4 | 0.0002L | 0.0002L | 0.20 | 3.2 |
4000~6300 | 0.5 | 0.0002L | 0.0002L | 0.25 | 3.2 |
Mounting requirements
Check relative parts sizes and process precision. Product parts(including outsourcing,cooperation part)must haveinspection certificate before assembly.
Parts assembled by the repair method,main size must fit for design requirements or technical regulations.
Assembling environments must be clean.Relative parts with bearings must clean up, without burr,oxidation skin,corrosionsbits,grains,dust,oil dirt etc before assembly, should comply with clean requirements
bearing and parts can not be knocked. scratch and corrosion during assembly Not allow hammer to hit slewing bearings,not allow to transfer mounting wallop through rolling elements,mountingbearings by proper tools.hanges.
After the slewing bearing is hoisted on the mounting base horizontally,insert ruler to check bearing plane with supportinghousing connection,in case gap to mechanize to repair or level up to avoid bolts serew down to distortion that infuenceslewing bearing rotation regularly(Picture 5-1).
Quenching "S"soft zone locating non-load or seldom load area while mounting quenching soft zone,(plug is around softone on ring).(Picture5-2).
Checking backlashto insure gear meshing accuracy and keep proper backlash while mounting. During opetation,ensurethat the meshing backlash at the highest point of the pitch circle runout of the large gear ring (3 painting green marksteeth)meets the requireme nts of design accuracy.(Picture5-3).
A dopt high strength bolts while mounting,according slewing bearing press condition to select intension class,bolts sizesand strength class standard GB5782,GB5783&GB3098.1,nut strength class are selected to standard GB3098.2.
Bolts washer to be used quenching & tempering washer,spring washer arestrictly prohibited. When radial load>10%axial load,slewing bearing need radial orientation,affer radial orientation,moment wrench has thesame pre-press by low,mid,high pre-pressing,and cross 180°direction symmetry screw down(Picture5- 5) to insure the lastbolts with the same pre-pressing,meantime check slewing bearing free rotation status(Picture5-4).
Mount bolts with enough pre-pressing,pre-press is 0.7 times of bolts materials yield limits,bolts yield limits as table 6-1:diferent dia bolts pre-load see table 5-2:
Table6-1:bolts yield limits
Bolts strength class | 8.8 | 10.9 | 12.9 |
Yield limits MPa | M≤ 16 640 M≥16 660 | 940 | 1100 |
Table6-2:Diferent dia bolts pre-load
| Bolts specifications GB5782-86 GB5783-86 | Mount hole dia(mm) | Bolts strength class(GB3098.1-82) | ||
| 8.8 | 10.9 | 12.9 | ||
| Bolts materials strength limits osmin(N/mm²) | ||||
| 640 | 900 | 1080 | ||
| MA(Nm)Pre-tighten torque MA(Nm) | ||||
| M12 | 13.5 | 77.5 | 110 | 130 |
| M14 | 15.5 | 120 | 170 | 210 |
| M16 | 18 | 190 | 265 | 320 |
| M18 | 20 | 260 | 365 | 435 |
| M20 | 22 | 370 | 520 | 620 |
| M22 | 24 | 500 | 700 | 840 |
| M24 | 26 | 640 | 900 | 1080 |
| M27 | 30 | 950 | 1350 | 1620 |
| M30 | 33 | 1300 | 1800 | 2160 |
| FA(10³N)Pre-tightening 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 |
Inspection after mounting
1)Before debugging slewing bearings,should fill in proper grease, move slowly while filling to make grease equallyspaced.
2) Make sure not effect bearing distortion while mounting,not allowed grounding line to weld slewing bearings
3) After all bolts are tightened,rotate the bearing more than 5 circles,and check whether the slewing bearing rotates Hexibly and interferes with other parts,whether sealing good,whether have abnormal ringing.After rotation,anew to checkb ab normal ringing.After rotation,anew to checkbacklash data and take a note.(Picture6-1)
