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Loss of Ear Corn in the Field
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Gatherer points set too high.
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Adjust gatherer points so tips just touch the ground when row unit skid plate is 1 in. above ground.
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When picking low hanging ears, raise front tip of gatherer points and run corn head with the skids close to the ground.
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Ground speed too fast or too slow.
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Operate at a speed to meet field and ground conditions. Too much ground speed can bend stalks forward and cause ears to fall ahead of gatherer chains. Too slow ground speed can cause gatherer chains to jerk stalks and snap off ears letting them slide out forward.
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Operate at a speed where gatherer chains help guide stalks into the rolls.
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Not picking planter rows.
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Pick rows as they were planted. It will be easier to follow the rows and eliminate loss of ears.
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Row units not centered on rows.
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Adjust corn head row spacing to equal row spacing of corn in field.
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Ears sliding out over gatherer chains.
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Use ear savers.
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Gatherer chain speed too fast or too slow.
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Change speed of variable speed feeder house or increase ground speed.
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| Symptom |
Problem |
Solution |
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(4420 Only) Get correct gatherer chain speed by changing feeder house powershaft drive sprocket or change variable ground speed of combine.
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Auger paddles throw out ears.
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Remove paddles if ear throwing is excessive.
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Install strippers on feeder house.
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Ear Shelling at Stalk Rolls
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Deck plates not adjusted correctly.
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Adjust deck plates.
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Machine operating too high.
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Raise point tip and run head lower.
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Shelled Corn Coming Out Rear of Combine
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Excessive trash intake from corn head.
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Increase variable drive speed or change sprocket drive ratio to increase corn head speed.
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Open deck plate spacing on corn head.
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Too much material in combine. Check corn head for too much stalk breakage that could be from rolls not being timed or deck plates closed too far.
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Ears Sliding Out Through the Throat
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Ear savers not adjusted right.
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Adjust ear savers.
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Ear savers worn out.
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Replace ear savers.
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Pulling up Corn stalks
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Deck plates set too close together.
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Spread deck plates, a little at a time, until stalks feed through rolls more freely.
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Traveling too fast for gatherer chain speed.
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Slow down to meet crop conditions or increase row unit drive speed.
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Gatherer chain flights digging into cornstalk roots.
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Lower gatherer points.
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Corn too dry or down.
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Remove ear savers.
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Worn stalk rolls.
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Replace stalk rolls.
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| Symptom |
Problem |
Solution |
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Plugging
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Stalks breaking in stalk rolls or deck plates.
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Adjust opening of deck plates. Check stalk roll timing so stalk roll flutes do not break stalks. Also be sure deck plates are set equally and centered over center of rolls.
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Trash winds around stalk rolls. Loose gatherer chains. Not picking planter rows.
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Set trash knives closer to stalk rolls. Check gatherer chain mechanism. Pick rows as planted. It's easier to follow the rows, reduce plugging, and eliminate loss of ears.
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Material catching on sheet metal.
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Check for broken or bent sheet metal. Remove rust and coat with TY6247 Slip-Plate Lubricant.
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Ground speed too fast, causing too much material to go into corn head too fast.
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Slow down. Operate at a speed to meet yield and ground conditions. Faster speed causes plugging.
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Material not flowing through auger.
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Check auger housing for obstructions and roughness. Check auger for 22 mm (7/8-in.) clearance.
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Auger plugs up from worn or curved paddles. Corn stalks plugging in gatherer throat opening. Worn stalk rolls.
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Reverse, double up (with cupping to center) or replace. Remove ear savers. Replace worn stalk rolls.
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Loss of Ear Corn From Weakened or Broken Stalks. Problem is Caused by Disease (Stalk Rot) or Insects (Corn Borers)
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Contact of stalk with ear savers.
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Remove ear savers.
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Ground speed too fast.
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Reduce ground speed.
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Feeder house speed incorrect.
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Find the correct speed for your conditions by trying different feeder house speeds.
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Stalks and ears badly "down" or "lodged" or loose ears on the ground.
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Retime gatherer chains so flights are opposite each other.
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Worn stalk rolls.
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Replace stalk rolls.
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