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Slewing Bearing Installation and Maintenanc
Anti-rust,packing,transportation
Anti-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.Iftransporting bearings without packing by wooden cases,more than three wooden cushion blocks shall be used to separate the product from the vehicle 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 to damage 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 the raceway,surface, gear surface, clear the surface and paint anti rust grease or industrial Vaseline fil No.2 pole lithium grease in inner raceway.
2) Place the slewing bearing on level at dry and plain site to prohibit the slewing bearing contact the ground under direct sunlight,keep far away from water pipe,steam pipe to avoid bearings corrosion,if many slewing bearings pile up together,each slewing bearing place at least 3 equal wooden mats around circle position,the position up and down show be the same(Picture 2-1).
3) If the slewing bearings 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 same products 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"as non-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 pinion side 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 and Corros1on.
Mounting bracket must be with rigidity,.intensity and impact resistance to avoid bearing distortion that infuences slewing precision.
A dopting canister shape welding bracket to avoid bracket distortion,after welding to treat remove inner stress treatment the mechanize,you can see Drawings 5-1 A.For uneasy to mechanize mounting plane,can level up to mount( Picture 4-1B)
Bracket bolt hole is the identical with slewing bearing mounting hole to avoid mount distortion(Picture 4-1C).
Slewing bearing connecting surface skills as 5-1 table, in 0°-90°-180 loop area.only allow a wave crest up to the value.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
Mounting requirements
Check relative parts sizes and process precision,Product parts(including outsourcing,cooperation part)must have inspection certifcate before assembly.
Parts assembled by the repair method,main size must ft for design requirements or technical regulations.
Assembling environments must be clean.relative parts with bearings must clean up, without burr,oxidation skin,corrosion bits,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,mounting bearings by proper tools.hanges.
A fter the slewing bearing is hoisted on the mounting base horizontally,insert ruler to check bearing plane with supporting housing connection,in case gap to mechanize to repair or level up to avoid bolts serew down to distortion that infuence slewing 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 soft one on ring).(Picture5-2).
Checking backlashto insure gear meshing accuracy and keep proper backlash while mounting. During opetation,ensure that the meshing backlash at the highest point of the pitch circle runout of the large gear ring (3 painting green marks teeth)meets the requirements of design accuracy.(Picture5-3).
A dopt high strength bolts while mounting,according slewing bearing press condition to select intension class,bolts sizes and 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 are strictly prohibited.
When radial load>10%axial load,slewing bearing need radial orientation,after radial orientation,moment wrench has the same pre-press by low,mid,high pre-pressing,and cross 180"direction symmetry screw down(Picture5-5) to insure the last bolts 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:
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Table6-1:bolts yield limits
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Table6-2:Diferent dia bolts pre-load
Inspection after mounting
I )Before debugging slewing bearings,should fill in proper grease, move slowly while filling to make grease equally spaced.
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 abnormal ringing.After rotation,anew to check backlash data and take a note.(Picture6-1)
