Repair of a slewing bearing Data Object Bucketwheel

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 t Damaged area: Slewing bearing between upper structure and chassis Problem: Some areas of the bearing showed damages outside the acceptable tolerance 1

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 Polymer. Metal® made by Multi. Metall – was chosen. All concerned damaged areas were prepared with shims. 2

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 Polymer. Metal resulted from the clearance between the shimms. 3

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 MMmetal SS-steel 382 were determined under consideration of the clearance to be filled up. 4

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

Repair of a slewing bearing After the application of MM-metal SS-steel 382 (liquid type) with Hardener green. 8

Repair of a slewing bearing Immediately after the application the 4 hydraulic cylinders were lowered stepby-step (cylinder per cylinder), carefully watching the pressure of each cylinder. 9

Repair of a slewing bearing During lowering the bearing housing surplus escaping MM-metal SS-steel 382 was removed. Afterwards the bolts were inserted. 10

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. 11

Polymer. Metall® made by Multi. Metall Germany invests for more than 40 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 Polymer. Metals can be preventatively protected against above mentioned stresses. Furthermore Multi. Metall’s cold repair technology facilitates a gentle material treatment and a durable repair of damaged parts. Multi. Metall the Metal. Existence. Company® 12

Multi. Metall & 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: 13

Essential parts of this publication are based on the presentation and information, kindly provided by EMHA technisch bureau b. v. is our exclusive partner in the Netherlands, who successfully carries out repairs by using our Polymer. Metals for many years. EMHA B. V. Noordeinde 13 3341 LW Hendrik Ido Ambacht Netherlands Multi. Metall P. O. Box 12 02 64 41720 Viersen Germany Tel: +31 180484343 Fax: +31 180418581 info@emhabv. nl www. emhabv. com Tel: 0 21 62 -97 00 9 -0 Fax: 0 21 62 -97 00 9 -11 info@polymermetal. com www. polymermetal. com Polymer. Metall® • Multi. Metall® • Ceramium® • Molymetall® • Sealium® • XETEX® Close presentation 14