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We run a 2003 9750 sts with yield monitoring and mapping. The problem we have is the ground speed reading on the cornerpost does not match the speed reading of the gps receiver. Because of this the acres counter reads high on every field. In the past i just changed the header size from 30 to 27 to offset the acre difference. Now with yield mapping this doesnt work. Is there any way to change what the combine uses for a speed reading or can you calibrate the combine groundspeed?

Thanks
 

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Yes, it's a matter of changing the tire radius on the display.
Sounds like you need to reduce it by 10% to get accurate reading.
I just played with mine until I got it to read the same as gps.
Sorry though I can't remember how to do it, but I'm sure someone here does.


Don
 

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There was when 1100 45R/46 tires weren't on the chart.

1100's are the only tire you can fit on that takes over 1000mm radius,
I believe it was 1022mm for the correct speed reading.

Don
 

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Cornerpost C03
112
_ _ _ _
nnnn
DISPLAY/MODIFY: Tire Rolling Radius in Millimeters
0 = undefined

346 = TRACKS

758 = 24.5 X 32 - R3

760 = BELTED

775 = 30.5L X 32 - R3

785 = 30.5LR X 32 - R1

790 = 18.4R 38 - R1

800 = 24.5 X 32 -R1

810 = 1050/50 R32

813 = 18.4 R38 - R2

813 = 20.8 R38 -

815 = 30.5L X 32 - R1

816 = 800/65 R32 R1-W172

825 = 68 X 50 - 32

827 = 20.8 R38 - R1

830 = 24
 

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You can more accuratley do this with a tape measure. Mark out say 5 complete tyre revolutions in mm, divide this to get 1x revolution which is the circumference, divide by 2x and then divide by 3.14 to get radius and this will provide a fairly accurate measurement to enter into above address C03 - 112.
 

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You COULD do that.
In the meantime I could try a setting, do a run to compare with gps and then final set it.
From the seat.

As accurate or more so then any other way.
Coarse if your not using gps your way would be the best way.


Don
 

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Ok 9750saskatchewan, you have your solution. Now go fix it and quit ordering all this rain around here. We need to get harvest started.


P.S - How much rain have you got total this week?
I've had 3 and 4 tenths so far.
 

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If you are mapping doesn't your ground speed read of your gps? I know my gps and radar read different on my sprayer.
 

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You guys have it easy! We've had over 4 inches in spots around here and Red River gumbo does not dry easily, especially with a crop canopy over it. Once again a muddy, messy harvest.
 

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Tom, I did a rolling check yesterday and came up with 950 for a CAL number for 20.8 X 42 - R1 tires on a 9760. Does that sound right?
 

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Tom, I did a rolling check yesterday and came up with 950 for a CAL number for 20.8 X 42 - R1 tires on a 9760. Does that sound right?

Don't what happen to these tire sizes, but that looks about right.


830 = 24.5 X 32 - R2

834 = 30.5L X 32 - R2

835 = 18.4 X42 - R1

838 = 18.4 R42 - R1

856 = 20.8 R42 - R1

860 = 650/75 R32 R1-

884 = 710/75 R34 R1

902 = 35.5L X 32 - R2

905 = 20.8 R42 - R2
 

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Tom,
I have another question for you. When mapping and showing the yield on a GS1 monitor, what speed does the monitor use? The ITC receiver (WAAS) or the CAL for the transmission that is being discussed here ------- or both?

Thanks,
 

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cornerpost HELP

Hi,
Could somebody here explain the proceedure for cornerpost speed calibration. ie "what to go into to adjust the calibration and step by step explanation", because I cant find it in the manual anywhere.
Manual has "How to Calibrations" for everything else but the speed.

Hoping somebody can help me out here.
Harvester type : 2003 9750sts, tyre size : 30.5LR 32 R1


Cornerpost C03
112
_ _ _ _nnnn
DISPLAY/MODIFY: Tire Rolling Radius in Millimeters
0 = undefined

346 = TRACKS

758 = 24.5 X 32 - R3

760 = BELTED

775 = 30.5L X 32 - R3

785 = 30.5LR X 32 - R1

790 = 18.4R 38 - R1

800 = 24.5 X 32 -R1

810 = 1050/50 R32

813 = 18.4 R38 - R2

813 = 20.8 R38 -

815 = 30.5L X 32 - R1

816 = 800/65 R32 R1-W172

825 = 68 X 50 - 32

827 = 20.8 R38 - R1

830 = 24
 

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  1. <LI class=list>Prepare the combine for Calibration:
    • Turn the Key Switch to the RUN position
    <LI class=list>Select Diagnostic Mode:
    • <LI class=list>Press the Diagnostic Button on the Cornerpost Display 2 (CPD2).
    • The Cornerpost Display 1 (CPD1) will display:
    -: Table

    Line 1
    _ - - -
    Line 2
    _ dIA
    Line 3
    _ _ _ _

    <LI class=list>Go to the desired controller:
    • <LI class=list>Press the Up Arrow and Down Arrow Buttons on the display to access the controller number (E01 shown).
    • The CPD1 should display:
    -: Table

    Line 1
    _ _ _ _
    Line 2
    _ E 0 1
    Line 3
    _ _ _ _
    • Press the Enter Button.
    <LI class=list>Go to desired address:
    • <LI class=list>Press the Up Arrow and Down Arrow Buttons on the display to located the desired address (117 shown). <LI class=list>Line 1 will show the address alternating with “InP”. This indicates that this address is one where numbers can be input.
    • The CPD1 should display:
    -: Table

    Line 1
    _ 117
    Line 2
    _ _ _ _
    Line 3
    _ n n n

    <LI class=list>Input the desired value:
    • <LI class=list>Press the Enter Button. <LI class=list>The first number of the value shown in Line 3 will flash. <LI class=list>Press the Up Arrow and Down Arrow Buttons on the display to increase or decrease the value of the flashing digit. <LI class=list>When the desired value is flashing, press the Calibrate button to move to the next digit. <LI class=list>Continue changing the value, one digit at a time until the desired value is shown on the CPD1.
    • Press Enter Button to enter the new value into memory.
    <LI class=list>Return to normal operation:
    • <LI class=list>Press the Back Arrow Button on the CPD2 twice to return to normal operation.
    • Turn the Key Switch OFF.
    • The next time the machine is started, this calibration information will be used by the combine
 
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