Repair lubrication solutions

Lubrication system repairs

“The decisive advantage of repair lubrication is that the girth gear drive remains fully operable and that high loads even increase the success of repair lubrication.”

Not long ago, the only way to make repairs to large girth gear drives involved costly mechanical procedures and the dreaded downtime.

Klüber has a better idea. When it comes to repairing the tooth flanks of large girth gear drives, repair lubrication provides a number of advantages over mechanical processing.

Even the operation of seriously damaged gear drives can be improved through repair lubrication so that replacement can often be postponed for several years. Further advantages are life span extension of girth gear drive components, and the ability to repair the girth gear drives in operation. To the operator this means that the girth gear drive can remain in operation and production can continue. No costs for gear outage arise. As the procedure is complex, it is recommended to consult experts before undertaking it.

Principle and Effect

Repair lubricants wear off material. They contain specially developed compounds that are highly active and effective. These compounds subject metallic surfaces to mechanical, chemical and corrosive wear. Thus a small amount of lubricant can remove just the right amount of flank material—corresponding to the customer’s repair needs and technical feasibility—in a short period of time.

Limitations of Repair Lubrication

Repair by controlled wear is limited by the degree and type of damage. Depending on the drive’s base material, removal of a few hundredths to several tenths of millimeters can be achieved. Generally, “only” a few hundredths millimeters are removed, but this can lead to significant operational improvement.

It is not recommended to use repair lubrication for the repair of burrs at the tip and the side of the teeth, material elevation, wear steps at the tooth root, sharp edges and deep pitting. These types of damage have to be repaired mechanically by milling (end-milling cutter, spherical cutter) or grinding (cutting-off wheel for material steps or abrasive buffs for flank treatment).

Ref: Wolfgang Gerhold