JD 20 series computer settings

[Flat 10]

Didn't know what to call this thread but 2 questions;
If I change the wheels will the speedo readout on the dash be incorrect?
And for some reason when you put it into forward from reverse it defaults to 3 powershift which is really annoying. My 6620 doesn't do this. Can it be set so that it either stays in the same powershift forward as back or defaults to 1. Must be able to be changed. It has the later 20 series dash.
@Tractortech, @Phil P @NZ Tech

 

[Phil P]

Didn't know what to call this thread but 2 questions;
If I change the wheels will the speedo readout on the dash be incorrect?
And for some reason when you put it into forward from reverse it defaults to 3 powershift which is really annoying. My 6620 doesn't do this. Can it be set so that it either stays in the same powershift forward as back or defaults to 1. Must be able to be changed. It has the later 20 series dash.
@Tractortech, @Phil P @NZ Tech

To set the forward reverse ratio put the tractor in P then hod the f/r leave up in the N position, the dash will the display + or - 1 to 3. Use the power shift buttons to alter the display to 0.

To alter the speed you’ll need to know the rolling circumference of the tyres you’ve fitted. It can then be adjusted in the bcu. However if you have a radar fitted it should do an auto calibration. I think it may give the tyre settings in the back of the manual, I’ll have to look it up myself.

 

[Flat 10]

That’s really helpful thank you. Not changed wheels yet so no rush. Just wanted to know if it was possible. I don’t think it has radar.