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Chesterton® PLS Fits Petro Chemical Air Fin Gearbox Oil Seal


Case study APAC0033 – Chesterton products – Chesterton EPS

Chesterton - Global Solutions, Local Service



The input shaft of a gearbox was suffering from frictional corrosion (fretting) causing oil leakage which needed frequent repairs. With the elevated position of the gearbox, it is difficult and expensive to repair and replace elements within, and so our client was looking for a solution to stop the fretting at its root. The Chesterton® PLS (Polymer Labyrinth Seal) was suggested and has provided long lasting results for over five years.

Products featured in the case study:

Chesterton® PLS



The input shaft of a gearbox was suffering from frictional corrosion (fretting) causing oil leakage which needed frequent repairs.

Root Cause

The location of the gearbox is in an elevated position, so replacing the seals is difficult and expensive.


Sealing Solution to prevent fretting corrosion.

The input shaft of a gearbox was suffering.



Gear box manufacturer: Nippon Gear Co., Ltd.
1170rpm: Input shaft

Model: FS28, 32, 36, 25, G7C TB35511: 3 pieces

TB456812: 15 pieces TB507212: 2 pieces

TB325211: 3 pieces


35 x 55 x 11: 3 pieces, 45 x 68 x 12: 15 pieces

50 x 72 x 12: 2 pieces, 32 x 52 x 11: 3 pieces

Chesterton® PLS—Polymer Labyrinth Seal

Made from Chesterton’s proprietary polymer material technology, the Chesterton, patent-pending Polymer Labyrinth Seal (PLS) is a non-contact bearing seal designed to provide protection for pumps, motors, gearboxes, and other rotating equipment in splash applications. The unique design eliminates fretting caused by conventional lip seals, and hel ps increase bearing and gearbox life by extending the mean time between equipment repairs.

Chesterton® PLS



Client Reported

The Chesterton PLS was installed in March 2016 and is still perfectly functional. Extended equipment life and uptime.

Installed in 2016 and still functional.


About Us

Chesterton global solutions, local service

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​.

Mentioned in this case study:


Exclusive Distributor of Chesterton products – Japan



® Registered trademark owned by A.W. Chesterton Company
Case Study APAC0033 – Issued 08/21

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