Agricultural Dryer Maintenance Checklist for Feed Producers

Let’s be honest: an idle dryer during harvest costs more than repair bills. We have seen feed producers lose entire batches because a burner failed or a moisture sensor drifted out of calibration. Regular maintenance prevents these surprises. This checklist focuses on seasonal tasks for your grain dryer—specifically the burner, fans, heat exchangers, and moisture sensors. Following these steps keeps your grain dryer running when you need it most. Even if your equipment comes from different grain dryer manufacturers, these core components require similar attention.

Burner Inspection: Clean the Flame Pattern

The burner is the heart of your grain dryer. Before each drying season, inspect the nozzle and ignition electrodes. Remove carbon buildup from the flame sensor. A yellow, lazy flame indicates incomplete combustion, which wastes propane or natural gas. A blue, sharp flame means proper air-fuel mixture. We recommend running the burner for 10 minutes and watching the flame through the sight glass. Also check the gas pressure at the manifold. For a typical grain dryer, manifold pressure should match the specification from your grain dryer manufacturers—usually between 5 and 10 inches of water column for natural gas. Record the pressure each season. A sudden drop points to a clogged filter or failing regulator.

Fan and Airflow System: Check Belts and Bearings

Fans move heated air through the grain column. A loose belt reduces airflow by 20% or more. Before you start drying, turn the fan by hand. Listen for grinding noises from bearings. Then run the fan for 30 minutes and measure air velocity at the exhaust. For a mixed-flow grain dryer, you want consistent velocity across all discharge points. Tighten belts to manufacturer specs. Lubricate bearings with high-temperature grease. Worn bearings cause shaft misalignment, which damages the fan housing. We have replaced several fan assemblies simply because a bearing failed mid-season. A simple weekly check prevents that.

Heat Exchanger: Look for Cracks or Leaks

The heat exchanger separates combustion gases from the drying air. A crack allows carbon monoxide into the grain, which poses safety risks and off-flavors in feed. Before each heavy use period, inspect the heat exchanger tubes or plates with a bright light and a small mirror. Look for soot streaks or rust lines. Small cracks can be welded if caught early. Large cracks require replacement. For a grain dryer that runs 1,000 hours per year, schedule a professional inspection every two seasons. Some grain dryer manufacturers offer endoscope checks for hard-to-reach areas.

Moisture Sensors: Calibrate Against a Reference

Moisture sensors are useless if inaccurate. A 1% error in reading means over-drying (wasted fuel) or under-drying (spoilage risk). At the start of each season, take a manual grain sample and test it with a certified moisture meter. Compare that reading to your grain dryer’s online sensor. Adjust the sensor offset accordingly. Also clean sensor surfaces with a soft cloth. Dust buildup creates false readings. For multi-crop operations, recalibrate every time you switch grain types. Corn and soybeans have different electrical properties that affect sensor response.

A seasonal maintenance checklist keeps your grain dryer reliable. Burners need clean nozzles. Fans need tight belts and fresh grease. Heat exchangers need leak checks. Moisture sensors need calibration against a known reference. At FAMSUN, we design dryers with service access in mind, but the maintenance principles apply across all grain dryer manufacturers. Spend one day on these tasks before harvest. That single day saves weeks of frustration later. Your feed quality—and your schedule—will thank you.