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Repair of a slewing bearing

Repair of a slewing bearing.

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Repair of a slewing bearing

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  1. Repair of a slewing bearing Data: Object Bucket-wheel excavator Concerned part Slewing bearing Diameter 4371 mm Bearing clearance ≤ 0,3 mm Axial force 700 tDamaged area:Slewing bearing betweenupper structure and chassisProblem:Some areas of the bearing showed damages outsidethe acceptable tolerance

  2. Repair of a slewing bearing Pre measurements showed differences up to 1,6 mm For the solution of this repair problem the high performance repair material MM-metal SS-steel 382 - a PolymerMetal® made by MultiMetall – was chosen. All concerned damaged areas were prepared with shims.

  3. Repair of a slewing bearing Arrangements The upper structure was lifted with 4 hydraulic cylinders. The new bearing was brought into position by hanging it under the upper structure on 6 thread rods leaving 50 mm space underneath. The required quantity of the PolymerMetal resulted from the clearance between the shimms.

  4. Repair of a slewing bearing Foam strip to avoid MM-metal SS-steel 382 being pressed out The quantity and position of the “lines” of MM-metal SS-steel 382 were determined under consideration of the clearance to be filled up.

  5. Repair of a slewing bearing The MM-metal SS-steel 382 was thoroughly applied above the bearing Bearing housing Shims Bearing Technical Data Sheets MM-metalSS-steel 382&Hardener green Chassis

  6. Repair of a slewing bearing After the application of MM-metal SS-steel 382 (liquid type) with Hardener green.

  7. Repair of a slewing bearing Immediately after the application the 4 hydraulic cylinders were lowered step-by-step (cylinder per cylinder), carefully watching the pressure of each cylinder.

  8. Repair of a slewing bearing During lowering the bearing housing surplus escaping MM-metal SS-steel 382 was removed. Afterwards the bolts were inserted.

  9. Repair of a slewing bearing Operation of the cylinders took a (scheduled) period of 2 hours. The pot life of MM-metal SS-steel 382 was extended by using the special Hardener green (instead of the standard Hardener yellow). To reduce the final curing time heat was applied by the use of welding mats with a temperature control system(maximum temperature 45 °C) to avoid an overheating of the bearing.

  10. PolymerMetall® made by MultiMetall MultiMetall Germany invests for more than 30 years in polymer-metallic material technologies for the maintenance of metals and alloys. In plants and constructions often functional particularly important components are exposed to stresses like break, tear, corrosion, cavitation, chemical or thermal demands. Components treated with PolymerMetals can be preventatively protected against above mentioned stresses. Furthermore MultiMetall’s cold repair technology facilitates a gentle material treatment and a durable repair of damaged parts. MultiMetallthe MetalExistenceCompany®

  11. MultiMetall & Internet Please feel free to visit our website! At www.polymermetal.com detailed information on our products and their usage can be found. Here are some screenshots of our website:

  12. EMHA technisch bureau b.v.P.O. Box 542980 AB RidderkerkNetherlands Tel: +31-18 04 84 34 3Fax: +31-18 04 18 58 1info@emhabv.comwww.emhabv.com MultiMetallP.O. Box 12 02 6441720 ViersenGermany Tel: 0 21 62-97 00 9-0Fax: 0 21 62-97 00 9-11info@polymermetal.comwww.polymermetal.com Essential parts of this publication are based on the presentation and information, kindly provided by EMHA technisch bureau b.v.. EMHA technisch bureau b.v. is our exclusive partner in the Netherlands, who successfully carries out repairs by using our PolymerMetals for many years. PolymerMetall® • MultiMetall® • Ceramium® • Molymetall® • Sealium® • XETEX® Closepresentation

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