4720 auto track issues - The Combine Forum
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post #1 of 11 (permalink) Old 04-24-2019, 06:27 PM Thread Starter
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4720 auto track issues

Yesterday early morning I got the sprayer out for the first time to do some work for the season. Goal was 400 acres of avadex to spray out. everything was working great till about 240 acres in

I run a 4720 jd sprayer with a gs2 2600 display for the auto track and a brownbox as the rate controller. Everything worked including engaging straight trac until I stopped for my 4th fill at 9am. Go to hit auto trac and it grabs the line and starts to track however it pulls aggressively to the left and right of the line never staying true to the center. it "hunts left then right then left then right never finding a straight path. Changed ab lines to go east/west instead and same conditions. try adaptive curves and same thing.

So now I'm back on shift at the plant here for the next 4 days wondering what could cause this. first things that comes to mind is to
1) Calibrate wheel angle sensor/and or replace
2) Calibrate hydraulic (EH) steering valve/and or replace
Never had to do either before but simple enough. Anything else I should be checking or looking at?

Anyone ever delt with this issue before and what was the cause? have owned this sprayer for 5 yrs and has never done this. Buddy said switching from the skinnys to float tires but I dont buy it as I have been switching them for yrs with no effects.

Much appreciated

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post #2 of 11 (permalink) Old 04-24-2019, 06:43 PM
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Had an issue like that quite a few years ago with the brown box gps. If I remember correctly I had to take the GPS in and the reciever to John Deere for them to do an update. That fixed it.

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post #3 of 11 (permalink) Old 04-24-2019, 09:14 PM Thread Starter
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ok that sounds like the simplest route to try first. I'll rip in the brownbox and starfire1 in for an update to see if that works. Thank you
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post #4 of 11 (permalink) Old 04-24-2019, 10:19 PM
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When our eh valve went out, the oil began to bypass inside the valve as the oil heated up and thinned out. Steered fine for the first tank or two, but then got worse with the same constant wandering/overcorrecting your describing. Also included a ssu fault that needed to be cleared before engaging autotrac again. If the autotrac works fine when the oil is cold, then its likely the eh valve.
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post #5 of 11 (permalink) Old 04-24-2019, 10:57 PM
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Originally Posted by helmach View Post
ok that sounds like the simplest route to try first. I'll rip in the brownbox and starfire1 in for an update to see if that works. Thank you
I think you mean, take the 2600 and starfire in.
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post #6 of 11 (permalink) Old 04-24-2019, 11:42 PM
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How much is it hunting? Little swings or extreme wide ones?

Once our 4830 started swinging in extremely wide arcs hunting the line. Turned out there was a frequency change for the signal that had to be input into the 2600. Was able to do it over the phone with our dealer.
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post #7 of 11 (permalink) Old 04-25-2019, 02:21 AM
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Ours did the exact same thing. It was the EH valve. It actually had a code that came up that said EH valve if I remember right but it's been a few years now. Clearing the codes in the gs2 would let u carry on for a while before it acted up again. The first time it acted up I was rolling along and it swerved left so violently I **** near cranked my skull into the glass. I should add that clearing the codes made it so u could use auto track again but it still wandered badly until that valve got changed.
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post #8 of 11 (permalink) Old 04-25-2019, 08:53 AM
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Our 4710 did the same thing, it was the EH valve.
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post #9 of 11 (permalink) Old 04-25-2019, 01:03 PM Thread Starter
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this was the only code from the other day. "receiver not receiving on alternate frequency"

but it let me use straight track for 2 tanks then died?

leaning towards verifying the correct frequency and or replacing that eh valve. the symptoms are the same as you are describing... cold oil works fine hot oil **** hits the fan and is a roller coaster ride.

thanks guys appreciate the fast feedback!!
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post #10 of 11 (permalink) Old 04-25-2019, 01:06 PM Thread Starter
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it swings probably 2 feet on either side of the line never disengaging but is very violent at 13 mph. boom sway and wear on the scissor suspension is severe

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