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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 beater 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.
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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 clean 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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| Symptom |
Problem |
Solution |
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High Grain Losses (Occurs at High Feed Rates Only).
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Fan speed too low.
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Increase fan speed.
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VISIONTRAK 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 sensor.
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Speed Range Selector Will Not Go in Reverse.
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Bent or broken parts in control linkage.
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Repair or replace as required.
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Linkages Binding.
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Frozen or worn ball joints on control cable.
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Lubricate or replace.
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Bell crank or pivots binding.
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Lubricate or replace.
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Control cable kinked or frozen.
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Replace if needed.
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System Overheats.
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Oil cooler or radiator plugged.
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Blow air through core and clean.
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Lack of charge oil flow.
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See your John Deere dealer.
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Engine fan belt slipping or broken.
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Check for worn or broken belt.
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Plugged oil filter.
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Change filter.
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Exceeding relief valve pressure.
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Shift to lower gear.
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Relief valve stuck closed.
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See your John Deere dealer.
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By-pass valve fails to close.
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See your John Deere dealer.
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High Oil Loss.
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Loose connections or leaking hydraulic lines, hoses or O-rings.
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Tighten connections or replace damaged lines, hoses or O-rings.
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Oil leaking into PTO gearbox.
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Replace hydraulic/steering pump.
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| Symptom |
Problem |
Solution |
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Combine Will Not Move Forward or Reverse.
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Transmission out of gear.
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Shift transmission.
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Low on oil.
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Check for leaks and correct. Fill reservoir.
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Air leak in system.
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Tighten connections.
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Control linkages broken or loose.
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Tighten loose linkages or replace as needed.
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Lack of charge flow or charge pressure.
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See your John Deere dealer.
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Plugged filter.
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Change filter.
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Exceeding maximum operating pressure setting.
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Shift to lower gear.
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Drive system unable to build up pressure.
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See your John Deere dealer.
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Relief valve open.
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See your John Deere dealer.
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Transmission Hard to Shift or Will Not Shift.
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Speed range control lever not in neutral.
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Move control lever to neutral.
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Transmission shift linkage out of adjustment.
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Adjust transmission shift linkage.
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Damaged, dirty, rusty or pinched shift cable.
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Inspect, clean, adjust or replace cable.
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Internal transmission problem.
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See your John Deere dealer.
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| Symptom |
Problem |
Solution |
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Ground Travel Speed Erratic.
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Low oil.
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Check for leaks and correct. Fill reservoir.
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Plugged filter.
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Change hydro charge filter.
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Exceeding maximum operating pressure setting.
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Shift to lower gear or engage four wheel drive.
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Speed control lever creeps toward neutral.
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See your John Deere dealer.
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System unable to keep charge pressure.
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See your John Deere dealer.
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Combine Will Not Stop When Speed Range Selector is in "N" Neutral Position.
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Control cable out of adjustment.
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Adjust cable for neutral position.
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Lack of Power or Lost Power. Combine Not Responding to Speed Range Selector.
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Low on oil.
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Check for leaks and correct. Fill reservoir.
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Plugged filter.
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Change hydro charge filter.
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Lack of charge flow or charge pressure.
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See your John Deere dealer.
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Dirty final fuel filter.
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Replace final fuel filter.
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Dirty pre-cleaner fuel filter.
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Clean precleaner fuel filter.
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Drive system unable to keep or build up pressure.
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See your John Deere dealer.
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