Combine Settings Guide and Trouble Shooting

Wheat (10-30 bu/ac)Wheat (30-50 bu/ac)Wheat (>50 bu/ac)Rice
Feeder House Face PlateTilted back towards combineTilted back towards combineTilted back towards combineTilted back towards combine
Feeder House Drive Sprocket26 tooth26 tooth26 tooth26 tooth
Feed AcceleratorFastFastFastFast
1st ConcaveSmall wireSmall wire Small wireRound Bar
2nd ConcaveSmall wireSmall wireSmall wireRound Bar
3rd ConcaveSmall wireSmall wireSmall wireRound Bar
Concave Closer BandsFitted 1st, 2nd & 5th positionFitted 1st, 2nd & 5th positionFitted 1st, 2nd & 5th positionNone Fitted
Separator Grate Closer Plates3 rows on left3 rows on left3 rows on left3 rows on left
L/H Auger Bed DeflectorExtendedExtendedExtendedExtended
R/H Auger Bed DeflectorDownDownDownDown
Sidehill Chaffer PlatesRemovedRemovedRemovedRemoved
Concave Position0-40-40-64--8
Combine Rotor Speed (rpm)650600550500
Cleaning Fan (rpm)1200 (*900)1250 (*1000)1350 (*1150)1350 (*1150)
Top Chaffer17171922
Bottom Sieve67822
* Applies to 60/70 series and S660/670/760/770 JD combines not 50 Series

Combine Feeder House Chain PositionHeaders with retractable fingers in the auger, chain should be up. Headers with NO retractable fingers, fully flighted auger with paddles, chain should be down.
Front Dust CoverTop section removed if retractable fingers fitted in auger and feeder house chain up, if no retractable fingers fitted then all sections fitted.
Header Rotor Speed (rpm)Stripping rotor should be run as slow as possible and still stripping the grain from the head.
Header Auger Speed (rpm)Header auger speed is fixed and is determined by auger drive sprocket, should always be under 200.

JD Rotary Combine Trouble Shooting

The most critical aspect of setting up a Rotary combine and stripper header is ensuring that an even load of material is maintained across the full width of the sieve from the rotor and that the material is split evenly between the rotor and sieves for separation. The direction of the rotor naturally tends to load the left side of the sieve, this then leads to losses on the left side and under-utilisation of the right side of the machine. In order to create an equal loading the sidehill sieve dividers and plates must be removed to allow the material to spread out, the right side shoe feed auger deflector must be removed and the left side auger deflector must be adjusted all the way out. Rear Separator blanking plates can then be used to fine tune the job, generally either 2 or 3 rows (8 or 12) are needed. It is very important to perform a ‘kill stop’ (stop the combine fully loaded) to check the grain and material other than grain (M.O.G.) distribution patterns within the combine.

The combine is not feeding smoothly Ensure that the feed accelerator roller at the top of the feeder house is in the fast position (inner pulleys) and that the large (26 tooth) feeder chain drive sprocket is fitted on the right side at the front of the feederhouse.
If ‘slugging’ is still experienced it may be necessary to lower the concaves.

Combine rotor loss is experienced Raise concaves to ensure grain is forced through, adjust rotor speed & check grain loss monitor.

Combine sieve loss is experienced Generally opening up the sieves more and increasing the fan speed will give greater sieve capacity, ensure that the balance is correct of splitting the load between the sieves and rotor, it may be that the rotor is way under capacity yet you are overloading the sieves. In this case it will be necessary to fit more blanking bands in the rotor to prevent such a high proportion of material falling onto the sieves.

Unthreshed heads appear in grain sample In this case it will be necessary to either close the concave a little to provide better threshing or fit additional concave blanking bands. It is initially recommended to fit these in position 1, 2 and 5. It may be necessary to fit these in position 3 also. In particularly tough threshing varieties it might be beneficial to close the bottom sieve and run these unthreshed heads through the combines return system.

See Mobile App for additional troubleshooting info.