JD 4720 Error Code Question

Furu · Jul 7, 2012

I have a 2007 JD 4720 that has been a fantastic machine. Two days ago I had an interesting "malfunction."
I was using my brush mower on a rather steep slope backing down the slope and then going back up the slope to cut some scotch-broom.
I suddenly had no response from my HST pedals and looked at the dash and the Malfunction Indicator was flashing and had an Error Code 1.
I thought maybe I had cavitated the hydraulics due to the slope causing the nose high pitch of the tractor.

After getting home I found the following description.

Manual description (Hope the formating makes the below readable)

Value-------Description-------------Problem Source------------Machine response---------Action
Err01---Forward and reverse pedals---Both pedals are depressed--Machine does not drive---Release both pedals and depress one at a time

While I did not think I depressed both pedals at the same time it is possible but I do know that after I saw the problem I depressed each one individually and had no response from the HST. It took maybe 10 -15 seconds before the malfunction light went out and the tractor would respond. This happened twice and I quit working the hill as it was not a comfortable feeling to be on that steep a hill and have no response and to have the tractor slowing drifting down waiting for it to go out of control. After getting home I looked up the code.

Does anyone know if it is normal to have a such a long delay, 10-15 seconds, for the reset before the code clearing and is there any other source/problem that could cause the code. I have been saying I am going to get the service manual and this may be the impetus that forces me to do so.
Thanks

arlen4720 · Jul 7, 2012

For the most part, I think that is normal. If you were creeping a bit, I wonder if you have to come to a stop, adding further to the delay???. I did that quite a bit in my first few hours of operation, and thinking it was kind of a long delay also.

Cocre · Jul 7, 2012

On the 3x20 series when you depress both pedals the tractor comes to an immediate halt and starts flashing an error. It remains flashing until both pedals are released and only one pedal depressed. Just coming off both pedals does not reset the display.

sunnyside360 · Jul 8, 2012

Had that happen a few times on both the 4320 and 3720 ehydro's. It does take several seconds to clear the error code. I've also reset the code by just turning off the ignition switch and starting again. Just figured it was legit with my big foot hitting both pedals at the same time. But, if it happens a lot it may be something else like an adjustment.

SwLWildcat · Jul 9, 2012

I wonder if there is a software update? I have a 2012 4720 and out of curosity I went out and hit both pedals at the same time. I did not get any error codes, nor did the tractor move. Maybe the dealer could update your computer?

arlen4720 · Jul 9, 2012

SwLWildcat said:
I wonder if there is a software update? I have a 2012 4720 and out of curosity I went out and hit both pedals at the same time. I did not get any error codes, nor did the tractor move. Maybe the dealer could update your computer?

I have a 2012 4720 and it throws the error when you press both pedals.

Furu · Jul 9, 2012

When I get back to the state I will have to experiment a bit to see what may or may not change the reset interval if anything. I just was not at all comfortable on a pretty steep slope (30-35 degree+/-) with no control and the tractor slowly drifting backward down the hill. At the time I had never seen an error code of any type in 5+ years of operating this unit. Guess I have been lucky that I never hit both pedals together before.

nhutlove · Sep 19, 2014

I have a jd 4720, my problem is, start the engine but could not move the screen .. error codes out of 03, 13 and 14 .. anyone have any experience in this case, give me direction reference Guides are not .. thanks a lot.