Problem with 4520 Hydro Trans

[rjm5133]

I have a 4520 cab tractor with a hydrostatic trans. the issue I'm having is when the machine is in "C" range it is moving very slow (about 4mph) in forward and almost comes to a stop on the slightest incline. The engine doesn't bog down or anything and it moves at full speed in reverse (about 16mph) with no issues. "A" and "B" ranges seem fine in forward and reverse and the loader and 3 point hitch work just as they always have. Because everything works normally except "C" range forward, it leads me to believe its a transmission problem.

I was wondering if anyone has had this issue. any advice would be much appreciated.

Thanks, Rob

 

[beenthere]

Is that an E-hydro tractor?

 

[rjm5133]

beenthere, yes it is an E-hydro tractor

 

[beenthere]

Then, do you have any codes flashing?

May need a trip, or a visit, with the Deere guy and the computer to reset something, or to figure out which sensor is failing or over-reacting. Seems it could be a number of things...

Do you have the service technical manual to do some trouble shooting?

 

[rjm5133]

No codes flashing. I do not have a service manual currently but ill get one.

 

[wolfpack2]

Do you have the automotive cruise control. If so make sure to turn off the SpeedMatch. It may be limiting the max speed on you.

 

[arlen4720]

Try it with Loadmatch OFF. If that helps then there could be an issue with the throttle position sensor, or engine speed sensor.

 

[rjm5133]

It does have cruise control. I tried turning the load match off, it didn't seem to make any difference.

 

[arlen4720]

You can put it into a test mode and see the raw sensor values on the display to make sure the forward pedal is putting out the proper range

 

[rjm5133]

Arlen4720, Do you know the procedure to put it in test mode.