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Cylinder Not Getting Full Speed Range
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Loose belts.
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Adjust belts.
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Slugging or Overloading of Cylinder.
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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 cylinder belt slipping at slow speed.
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Adjust sheave gap.
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Hydraulic problem.
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See your John Deere dealer.
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Concave-to-cylinder spacing too close or too wide.
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Adjust concave-to-cylinder spacing.
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Cylinder speed too slow for crop.
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Increase cylinder speed.
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Too much material entering cylinder.
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Reduce ground speed.
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Backfeeding of Cylinder.
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Engine not up to correct speed.
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See your John Deere dealer.
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Separator curtains slowing crop too much.
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Remove front curtain.
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Beater grate in upper position.
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Lower beater grate.
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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 combining.
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Cylinder speed too slow.
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Increase cylinder 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 not level.
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Level concave. See your John Deere dealer.
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Cylinder to concave spacing too wide.
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Close cylinder-to-concave spacing until tight bar ticks to increase threshing action.
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Unthreshed heads passing through concave.
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Install concave cover plates to keep unthreshed heads from passing through grate.
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Uneven feeding to cylinder.
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Check feeder conveyor 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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| Symptom |
Problem |
Solution |
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Too Much Cracked Grain In Tank.
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Cylinder speed too fast for crop.
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Decrease cylinder speed just enough to stop grain cracking, but still do a good threshing job, and/or open concave slightly.
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Cylinder-to-concave spacing too close.
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Open cylinder-to-concave spacing just enough to stop cracking.
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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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Reduce fan speed.
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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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Using wrong type of rasp bars.
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See rasp bar information in the Separator section of this manual.
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| Symptom |
Problem |
Solution |
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Grain Loss Over Straw Walkers.
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Damaged or missing straw walker curtain.
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Install new curtain.
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Straw walker overloaded due to incomplete threshing or late threshing at concave.
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Reduce cylinder to concave spacing and/or increase cylinder speed to increase threshing action.
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Straw walker openings plugged so threshed grain cannot drop through to walker return pan.
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Clean out openings in straw walkers.
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Straw walkers overloaded so grain cannot get through material to walker return pan.
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Reduce ground speed. Check to be both curtains are in place.
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Raise platform to cut less material.
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Beater grate in low position.
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Move grate to high position.
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Material over threshed and pulverized.
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Cylinder-to-concave setting too close and/or cylinder speed too fast. Increase spacing.
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Straw walker pans not extended.
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Extend walker pans.
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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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Material Lodging On Straw Walker and Not Being Evenly Discharged From Rear of Combine
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Material catching on straw walker curtain and building up on front of walkers.
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Remove front curtain.
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Material not flowing evenly to walkers.
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See "SLUGGING OR OVERLOADING OF CYLINDER".
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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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| Symptom |
Problem |
Solution |
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Too Much Trash (Ground Up Weeds) in Tailings.
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Chaffer and extension too far open for weedy conditions.
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Close chaffer and extension.
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Cylinder too fast or concave too tight.
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Reduce cylinder speed and/or open cylinder-to-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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Pre-cleaner open.
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Close pre-cleaner.
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Cylinder not threshing enough.
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Increase cylinder speed and/or close cylinder-to-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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Pre-cleaner too far open in corn or pre-cleaner not closed in grain crops.
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Adjust or close pre-cleaner.
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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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Pre-cleaner closed (corn only).
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Open pre-cleaner.
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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 Feedrates or High Feedrates).
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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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Pre-cleaner not open far enough.
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Open pre-cleaner.
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High Grain Losses (Occurs at High Feedrates Only).
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Fan speed too low.
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Increase fan speed.
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Unloading Auger Will Not Shut Off.
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Cylinder rod stop out of adjustment.
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Adjust stop.
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Cleaning Shoe Sensors Plugging Up with Trash.
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Trash is getting caught between plastic fingers and sensor.
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Remove fingers over the sensor.
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