January 11th, 2021

Starting The Year Right!











I bet we can all agree we’re thankful for a new year! And now that we’re here in 2021, let’s kick the year off right! What better way than to start with maintenance. In this blog, we provide a checklist to ensure your extruder is primed for peak performance. Here are the 10 extruder components we suggest checking as part of a healthy maintenance plan. Each one of these items is recommended for quarterly maintenance unless otherwise noted.

Control Panel

  • Clean and inspect inside of the control panel. Look for burned wiring and signs of component overheating.
  • Make sure all terminal connections are tight.
  • Check that receptacles are grounded.
  • Test and monitor operating conditions. Check amp draw of three-phase motor input.
  • Check and calibrate all temperature and pressure controllers.
  • Check all ground connections and verify continuity (yearly).
  • Check and verify drive potentiometer speed, as equipped (yearly).

Feedscrew and Barrel

  • Clean and inspect pressure gauge transducer.
  • Measure and record feedscrew flight and barrel diameters (yearly).
  • Conduct Liquid Penetrate Non-Destructive Test (NDT) for cracks on feedscrew and barrel (yearly).
  • Clean and inspect feedscrew and barrel (as needed).

Bolted Connections

  • Check all bolt and mounting hardware throughout the entire system for tightness and damage.
  • Reference component torque requirements in your maintenance manual.

Electrical Connections

  • Inspect all conduits for wiring and damage.
  • Inspect electrical leads for cuts, fraying abrasions or other damage.

Feed Section and Hopper

  • Inspect feed section and hopper for excess wear and damage.
  • Clean and inspect feed section cooling passage.
  • Check feedscrew bushing for excess play and wear (as needed).

Barrel Heaters

  • Measure and record heater amperage and resistance.
  • Clean and inspect barrel heater fins.
  • Check all thermocouple and heater terminal connections.
  • Measure and record blower fan motor temperatures. 

Barrel Blowers

  • Clean and inspect blower intake and exhaust for proper flow and ventilation.
  • Measure and record fan motor temperature.
  • Lubricate blower motor (as needed).

Water Cooling System and Rotary Unions

  • Inspect pump seals for leaks.
  • Test and calibrate pressure and temperature regulators (yearly).
  • Check water flow from plant water supply lines (yearly).
  • Clean and inspect heat exchanger (as needed).
  • Check the zinc anode plug for deterioration and corrosion (as needed).

Electric Motors

  • Inspect all electrical connections and wiring for tightness and damage.
  • Check belts for excess wear and proper tension (deflection).
  • Clean and inspect internal component conditions of motor (yearly).
  • Test and record the condition of all operating components (as needed).
  • Lubricate motor bearings (according to manufacturer instructions).

Gear Reducer

  • Check oil cleanliness on lube system and oil filter.
  • Clean gearcase of sediment, sludge and metal particles.
  • Visually inspect gear sets for damage and wear through site glass.
  • Check bearing noise and vibration.
  • Check thrust shaft run-out and bearing play.
  • Check drive coupling for proper alignment (yearly).
  • Lubricate drive coupling (as needed).
  • Change oil in gear reducer (as needed or every 4,000 hrs.).
  • Clean and inspect heat exchanger (as needed).

For a complete checklist that includes daily inspection items, please refer to the maintenance instructions in your extruder’s operational and technical manual. Here’s to a productive 2021!

Download your free printable PDF checklist!

Have questions regarding this blog post? E-mail marketing at marketing@davis-standard.com

Do you need immediate service help? Contact +1 844 MY DAVIS


The D-S Connect Blog Team


(Please note, this post was repurposed and updated from the January 11, 2020 post)

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4 Replies to “Starting The Year Right!”

    1. Thank you kindly, Alexander! We’re happy to hear you find this information useful. Is there something you do or require your team to do at the beginning of the year or quarterly, that we did not list?

    1. Thank you kindly for your feedback Patil! What type of operational information are you looking for? The more specific, the better. If we do not have something you need in our blog already, I can bring up your topic to the team and see what we can do to get your request met.

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