Repair of a slewing bearing

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
areaSlewing bearing betweenupper structure and
chassisProblemSome 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
382Hardener green
Chassis
6
Technical Data Sheet MM-metal SS-steel 382
7
Technical Data Sheet Hardener green
8
Repair of a slewing bearing
After the application of MM-metal SS-steel 382
(liquid type) with Hardener green.
9
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.
10
Repair of a slewing bearing
During lowering the bearing housing surplus
escaping MM-metal SS-steel 382 was
removed. Afterwards the bolts were inserted.
11
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.
12
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 MultiMetalls cold repair
technology facilitates a gentle material
treatment and a durable repair of damaged parts.
MultiMetallthe MetalExistenceCompany
13
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

14
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