November 20th, 2018

Keeping the Extruder “Engine” Primed


At Davis-Standard, we like to refer to the gearcase as the engine of the extruder. Just as it’s important to keep the engine of your car well-maintained, keeping the gearcase in prime condition can significantly impact your bottom line. Energy consumption, processing efficiency, product quality and outputs are all influenced by gearcase operation. To ensure longevity and performance, we recommend regular maintenance and inspections. Here are five tips to keep the engine of your extruder running strong.

  1. Routine inspection – Visually inspect the gearcase on a regular basis, including listening for new noises.
  2. Oil and filter changes – This should be done every 4,000 machine hours with the same oil brand and grade.
  3. Monitor bearings – Look for increased bronze and steel particles and cast-iron powder. Build-up indicates it’s time for a replacement.
  4. Monitor temperature – The operating temperature of the sump oil should never exceed 71°C (160°F).
  5. Be proactive – The cost to rebuild before failure is less expensive than after failure.

If you think you may need a retrofit or rebuild, we can assist you with a thorough inspection. We quote standard parts and labor on all repairs and discuss recommendations with the customer prior to beginning work. This includes disassembly and inspection of all gears, pinion shafts, bores, feed section and bushing. In a typically retrofit, we replace, reassemble and reset all bearings, and install a new oil system if needed. The gearcase is then tested and repainted. Gearcases are typically shipped to our facility in Pawcatuck, Conn., and work is completed within a week. Gearcases are shipped back to the customer with a full factory warranty. On-site installation is optional.

If you would like more information on parts and upgrades, please visit our website page.  Also, if you have additional questions or would like to learn more about retrofitting or rebuilding your gearcase, please contact


The D-S Connect Blog team

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