Novexa 55 rue Linné 26500 Bourg les VALENCE
Contact us+33 (0)4 75 25 14 18 France

Defects treated (tires)


They are generally due to:

  • A problem of meshing gear in the case of a pinion/girth gear harness
  • Differences in diameter driven by friction
  • Poor adjustment or poor alignment

The on-site machining by Novexa solves this defects durably.


This phenomenon is entailed by high Hertz pressures. A poor load distribution, undersizing, flatness defects and steps often trigger these types of damages.
These defects must be taken seriously as their development are underlying, and are irreversible.

We therefore recommend a machining intervention to take care of them.


These types of damages are common and can occur for different reasons:

  • Presence of graphite linked to an abrasive environment
  • Substantial Out-of-true on rolling elements
  • Insufficient hardness on rolling elements
  • Excessive opposite steering of 2 rollers on a single tire
Material discharges

Numerous factors can trigger this type of deformation:

  • Change of lubrication mode without changing adjustment measures
  • Too much slipping effort linked to an excessive friction coefficient
  • Rollers' lack of parallelism
  • Insufficient hardness (creeping on the edges)

A high-hardness roller or tire is less likely to be subject to creeping. However, risks of chipping are high.
The same reasoning is valid for gears.
Hardness measurements, conducted on every rotative element are therefore essential.

Steps and flatness

Steps and flatness defects can block the tube's shaft and trigger:

  • Cracking on the ends
  • Concave/convex wear on tires and gears
  • Pressure on bearings with a risk of breakage during operation