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Improved MTBM for Excavator

Challenge

Issue

A continuous surface lignite mine was experiencing severe leakage of worn, scored vertical and horizontal leg cylinders in the walking units of a bucket-wheel excavator (BWE). Leakage caused an unplanned shutdown and production loss.

OEM rubber seals were leaking shortly after installation. They had no ability to conform to surface irregularities of the damaged rods.

Upon inspection, the OEM rubber wiper was found ineffective. It led to scoring of the piston rod in an abrasive environment.

Excavator in operation.

Excavator in operation.

Solution

Recommendation

Chesterton’s local specialist recommended a cylinder upgrade solution with the ability for on-site installation, reducing mean time to repair. This included:

  • A high-performance, split wiper used in combination with split stacked set.
  • Chesterton® 21K – A positive rake profile that effectively wipes away contaminants and protects
    the cylinder.
  • Chesterton® 8K – A positive rake design that provides optimum operating conditions. Further dual material combination works on worn, damages rod surface.
Vertical and horizontal cylinders of the walking unit

Vertical and horizontal cylinders of the walking unit.

Results

The end-user was extremely satisfied with the performance, which resulted in less frequent downtime and shorter seal replacement works on site.

  • Improved performance and reliability.
  • Postponed the capital repair of large diameter, heavy-duty hydraulic cylinders.
Vertical and horizintal cylinders of the walking unit

Vertical and horizontal cylinders of the walking unit.

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