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Data: Object Bucket-wheel excavatorConcerned part Slewing bearingDiameter 4371 mmBearing clearance ≤ 0,3 mmAxial force 700 t

Damaged area:Slewing bearing betweenupper structure and chassis

Problem:Some areas of the bearing showed damages outsidethe acceptable tolerance

Repair of a slewing bearing

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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.

Repair of a slewing bearing

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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.

Repair of a slewing bearing

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The quantity and position of the “lines” of MM-metal SS-steel 382 were determined under consideration of the clearance to be filled up.

Foam strip to avoid MM-metal SS-steel 382 being pressed out

Repair of a slewing bearing

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Bearing housing

Bearing

Chassis

Shims

Technical Data Sheets

MM-metalSS-steel 382

&Hardener green

The MM-metal SS-steel 382 was thoroughly applied above the bearing

Repair of a slewing bearing

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Repair of a slewing bearing

After the application of MM-metal SS-steel 382 (liquid type) with Hardener green.

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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.

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Repair of a slewing bearing

During lowering the bearing housing surplus escaping MM-metal SS-steel 382 was removed.

Afterwards the bolts were inserted.

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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.

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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®

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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:

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PolymerMetall® • MultiMetall® • Ceramium® • Molymetall® • Sealium® • XETEX®

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.

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

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