Feeding Screw Blockage or Constant Cotter Pin Breakage
If your feeding screw is getting blocked or the cotter pin keeps breaking, this guide will help you understand the causes and how to resolve the issue effectively.
Initial Steps
- 🔧 Remove the feeding screw and motor reducer
- 🧼 Clean the inside of the screw tube — coal, wood particles, or debris may be stuck
- 💨 Clear out accumulated dust, especially after long usage
Possible Causes of Blockage or Breakage
- 🌧️ Corrosion due to wet coal and sulfuric substances
- 🔩 Worn or damaged screw surface (indentations, pitting, uneven areas)
- ⚠️ Increased resistance leads to blockages, broken cotter pins, and system alarms
Note: A rough, corroded surface significantly increases mechanical resistance, risking motor failure and safety system triggers.
Recommended Solutions
- ✨ Polish the feeding screw until the surface is smooth and shiny
- 🎨 Apply anti-corrosion paint
- 🔁 Replace the screw if damage is too extensive
Ordering a Replacement Feeding Screw
When ordering a new screw, be sure to provide the following:
- 📌 Boiler model and manufacturer of the feeder
- 📏 Length of the working part of the screw
- 📐 Length and diameter of the fitting (shaft) part
- 🧩 Whether the fitting shaft includes:
- a groove for a chock
- a hole for a cotter pin
Pro Tip: Regular maintenance and inspections help avoid unexpected mechanical failures and ensure smooth fuel delivery.
