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Slugging or Overloading of single tine separator.
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Engine not up to correct speed.
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See your John Deere dealer.
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Variable speed single tine separator belt is slipping at slow speed.
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Adjust sheave gap.
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Concave to single tine separator spacing too close or too wide.
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Adjust concave spacing.
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Single tine separator speed too slow for crop.
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Increase separator speed.
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Too much material entering separator.
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Reduce ground speed.
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Backfeeding of Feed Accelerator.
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Single tine separator speed too slow for crop.
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Increase separator speed.
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Accelerator speed in slow speed position.
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Change accelerator speed to high speed position.
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Feed accelerator wings on smooth wear strip.
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Switch to serrated wings.
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Dirt and sap buildup on feed floor.
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Clean.
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| Symptom |
Problem |
Solution |
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Grain Not Threshed.
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Crop not ready to thresh.
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Test moisture of crop before threshing.
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Single tine separator speed too slow for crop.
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Increase separator speed enough to do a good job of threshing but do not increase speed to the point where grain cracks.
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Concave spacing not even from front to rear.
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Adjust to specifications.
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Concave spacing too wide.
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Close single tine separator to concave spacing until tight bar ticks, to increase threshing action.
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Uneven feeding to single tine separator.
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Check feeder conveyer chain tension and float in feeder house.
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Not enough material entering combine for proper threshing action.
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Increase ground speed.
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Too Much Cracked Grain in Tank.
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Single tine separator speed too fast for crop.
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Decrease single tine separator speed just enough to stop grain cracking, but still do a good threshing job.
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Concave spacing too close.
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Open concave just enough to stop cracking.
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Feed accelerator speed too fast for crop.
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Decrease feed accelerator speed by switching to low speed drive.
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Too much clean grain in tailings, causing grain to crack when rethreshed.
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Open sieve slightly to reduce tailings.
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Not enough straw entering combine.
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Increase ground speed.
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Dented auger housings or bent auger shafts cracking grain between flights and housings.
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Remove dents from auger housings and/or straighten bent auger shafts.
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Serrated beater wings.
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Install smooth beater wing strips or back swept.
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| Symptom |
Problem |
Solution |
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Separator Grain Loss
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Separator overloaded due to incomplete threshing or late threshing at the concave.
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Reduce single tine separator to concave spacing and/or increase separator speed to increase threshing action.
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Almost No Chaff in Tailings. Grain Tank Very Clean.
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Fan speed is too high and/or chaffer not open far enough.
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Reduce fan speed and/or increase chaffer opening.
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Some Chaff in Tailings. Grain Tank Clean.
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Sieve is closed too tight.
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Open sieve.
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Heavy Chaff in Tailings. Grain Tank May Range from Good to Dirty.
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Sieve is closed too tight and fan is too slow.
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Open sieve and increase fan speed.
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Too Much Trash (Ground Up Weeds) in Tailings
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Chaffer too far open for weedy conditions.
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Close chaffer.
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Single tine separator too fast or concave too tight.
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Reduce separator speed and/or increase concave spacing.
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Dirty Grain Tank (Unthreshed Heads).
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Sieve too far open.
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Close sieve.
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Single tine separator not threshing enough.
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Increase separator speed and/or decrease concave spacing.
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Dirty Grain Tank (Mostly Chaff).
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Fan speed too slow.
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Increase fan speed.
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Cob deflector installed.
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Remove cob deflector.
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Damaged chaffer/sieve elements.
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Cob deflector not installed.
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Install cob deflector.
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Loss of Grain Over Cleaning Shoe (Grain Tank is Clean).
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Chaffer closed.
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Open chaffer.
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Fan speed incorrect.
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Adjust fan speed. Check tailings, losses and grain tank.
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High Grain Losses (Occurs at Low Feed Rates or High Feed Rates).
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Fan speed too fast.
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Reduce fan speed.
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Chaffer not open far enough.
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Open chaffer.
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