John Deere 4410 Hydro drive problem

[morte001]

I am new to forum but looks great for owners

I have a John Deere 4410 Hydro and have tried to calibrate it and have tested everything and it all seems ok
I can do the foot pedal calibrations ok and the throttle calibration but when I do the drive calibrations there is no output voltage to the proportional valves
so the wheels don't turn and there is only a slow pulse from the MFWD sensor
The error code after the throttle calibration is Slow Slow Long Slow and Slow Long Long Long

Have replaced flywheel sensor and MFWD sensor

Any clues or questions guys

 

[4310]

I don't know anything about calibration other than to NEVER attempt it but I thought I would chime in with my ignorance.

Why are you calibrating it?

 

[morte001]

Thanks for response
I have got instructions on how to do calibration off local dealer and have replaced some of the sensors even though they tested ok, but still cant get any drive

 

[dfkrug]

The error code after the throttle calibration is Slow Slow Long Slow and Slow Long Long Long

What does the Technical Manual say about that code? If you don't have it, you can usually
buy the PDF version for a reasonable price.

That said, there are interlock safety switches for the PTO, seat, go-pedals, and brakes. These
often fail and need attention. I have never owned an eHydro, but the safety switches in other
JDs are a regular problem, esp as the tractors get older.

 

[morte001]

The code says it could be the flywheel sensor which I have tested and the MFWD which is working but wont give me correct reading until the drive is running but there is no voltage to the proportional valves.

 

[Slowlk]

Hi did u fix your tractor? I have same problem

 

[morte001]

Hi did u fix your tractor? I have same problem

I simulated a small DC voltage on to the proportional valve to get it a small amount to drive then proceeded with a calibration, Its a long time since I did it so the detail is a bit sketchy