OMCQ74935

Symptom	Problem	Solution
Slugging or Overloading of Separator.	Engine not up to correct speed.	See your John Deere dealer.
	Single tine separator variable drive belt is slipping as slow speed.	Adjust sheave gap.
	Concave to separator spacing too close or too wide.	Adjust concave spacing.
	Separator speed too slow for crop.	Increase separator speed.
	Too much material entering separator.	Reduce ground speed.

Backfeeding of Feed Accelerator.	Separator speed too slow for crop.	Increase separator speed.
	Accelerator speed in slow speed position.	Change accelerator speed to high speed position.
	Feed accelerator wings on smooth wear strip.	Switch to serrated wings.
	Dirt and sap buildup on feed floor.	Clean feed floor.

Grain Not Threshed.	Crop not ready to thresh.	Test moisture of crop before threshing.
	Separator speed too slow for crop.	Increase separator speed enough to do a good job of threshing, but do not increase speed to the point where grain cracks.
	Concave spacing not even from front to rear.	Adjust to specifications.
	Concave spacing too wide.	Close separator to concave spacing until tight bar ticks, to increase threshing action.
	Uneven feeding to separator.	Check feeder conveyer chain tension and float in feeder house.
	Not enough material entering combine for proper threshing action.	Increase ground speed.

Too Much Cracked Grain in Tank.	Separator speed too fast for crop.	Decrease separator speed just enough to stop grain cracking, but still do a good threshing job.
	Concave spacing too close.	Open concave just enough to stop cracking.
	Feed beater speed too fast for crop.	Decrease feed accelerator speed by switching to low speed drive.
	Too much clean grain in tailings, causing grain to crack when rethreshed.	Open sieve slightly to reduce tailings.
	Not enough straw entering combine.	Increase ground speed.
	Dented auger housings or bent auger shafts cracking grain between flights and housings.	Remove dents from auger housings and/or straighten bent auger shafts.
	Serrated beater wings.	Install smooth beater wing strips or back swept.

Separator Grain Loss

Separator overloaded due to incomplete threshing or late threshing at concave.

Reduce separator to concave spacing and/or increase separator speed to increase threshing action.

Broken cob pieces in grain tank.

NOTE: Spacers should be used in corn and soybeans only. Remove spacers for all other crops.

Install separator grate spacers to reduce broken cob pieces.

Almost No Chaff in Tailings. Grain Tank Very Clean.

Fan speed is too high and/or chaffer not open far enough.

Reduce fan speed and/or increase chaffer opening.

Some Chaff in Tailings. Grain Tank Clean.

Sieve is closed too tight.

Open sieve.

Heavy Chaff in Tailings. Grain Tank May Range from Good to Dirty.

Sieve is closed too tight and fan is too slow.

Open sieve and increase fan speed.

Too Much Trash (Ground Up Weeds) in Tailings.	Chaffer too far open for weedy conditions.	Close chaffer.
	Separator too fast or concave too tight.	Reduce separator speed and/or increase concave spacing.

Dirty Grain Tank (Unthreshed Heads).	Sieve too far open.	Close sieve.
	Separator not threshing enough.	Increase separator speed and/or decrease concave spacing.

Dirty Grain Tank (Mostly Chaff).	Fan speed too slow.	Increase fan speed.
	Cob deflector installed.	Remove cob deflector.

Dirty Grain Tank (Small Pieces of Cob).

Broken cob pieces in grain tank.

NOTE: Spacers should be used in corn and soybeans only. Remove spacers for all other crops.

Install separator grate spacers to reduce broken cob pieces.

Damaged chaffer/sieve elements.

Cob deflector not installed.

Install cob deflector.

Loss of Grain Over Cleaning Shoe (Grain Tank is Clean).	Chaffer closed.	Open chaffer.
	Fan speed incorrect.	Adjust fan speed. Check tailings, losses and grain tank.

High Grain Losses (Occurs at Low Feed Rates or High Feed Rates).	Fan speed too fast.	Reduce fan speed.
	Chaffer not open far enough.	Open chaffer.

High Grain Losses (Occurs at High Feed Rates Only).

Fan speed too low.

Increase fan speed.

VisionTrak Cleaning Shoe Sensors Plugging Up with Trash.

Trash is getting caught between plastic fingers and sensor.

Remove fingers over sensor.

OUO6075,0000709-19-20070328