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Extending seal life in limestone gearbox


During the drying process of limestone in manufacturing cement, a conveyor drive gear seal leaked profusely.

The existing seal is a thin ‘V’ shape, two-step ring which only lasts six months. The centring of the seal case is challenging due to the large equipment size and equipment run-out issues.

Root cause: oscillating equipment and case misalignment.

Objective: reduce oil leakage and extend seal life.


After a root cause analysis, Chesterton Specialists selected the Chesterton R22KN5 Split Rotary Seal, a proven design with a long lip and robust structure for slow-rotating applications exposed to large shaft run-out.

Chesterton R22KN5 Split Rotary Seal– high-performance, proved design for slow rotating applications exposed to large shaft run-out.

  • Flexible, dynamic lip design for large shaft run-out compensation
  • Split configuration simplifies installation
  • Allows stack set arrangement and provides stability
  • Excellent abrasion-resistance; withstands demanding environments

Chesterton R22KN5 Split Rotary Seal


The original V seals were replaced every six months due to oil leakage.

Labor cost: USD 230×2 men×12 times = USD 5,520

Packing cost: USD 1,500×2 rings×12 times = USD 36,000

After implementing the Chesterton solution, the machine has been in operation for over 69 months with only a small amount of leakage.

Labor cost: USD 230×2 men×1 time = USD 460
Packing cost: USD 2,200×1 ringx1 time = USD 2,200

Total Savings = USD 38,860 (in 69 months)

Chesterton R22KN5 Split Rotary Seal

About us

Chesterton® is a world leader in helping process industry companies and manufacturers improve the reliability and efficiency of their rotating, stationary, and fluid power equipment platforms. We are known across a wide range of industries for our award-winning pump and valve sealing solutions, applications expertise, equipment maintenance and wear-prevention products, and knowledgeable hands-on local service. Chesterton product range includes mechanical seals, packing and gaskets, industrial lubricants and coatings.

® Registered trademark owned by A.W. Chesterton Company

APAC0065.  Issued 01/2023.

Technical data reflects results of laboratory tests and is intended to indicate general characteristics only. A.W. Chesterton Company disclaims all warranties expressed or implied, including warranties of merchantability and fitness for a particular purpose. Liability, if any, is limited to product replacement only. Any images contained herein are for general illustrative or aesthetic purposes only and are not intended to convey any instructional, safety, handling, or usage information or advice respecting any product or equipment. Please refer to relevant Safety Data Sheets, Product Data Sheets, and/or Product Labels for safe use, storage, handling, and disposal of products, or consult with your local Chesterton sales representative

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