John Deere 6420 - Weird Beeps at Startup but No Error Codes? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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Old 08-03-2011, 12:25 AM   post #1 of 4
s3nt3nc3d
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Default John Deere 6420 - Weird Beeps at Startup but No Error Codes?

I've been having issues with our JD 6420 at work that it's never done before... when I first start it (or even just kick the ignition on), it gives 2 short beeps, 1 REAAAAAALLY long beep, and 2 short beeps. No lights flashing anywhere and no error codes when I go into diagnostic mode on it.

It just started doing it yesterday...

I have been having issues with one particular code...can't remember the code off the top of my head but was an SFA code that said something like TLS stuck in the "down" position. When that code is thrown, I get a light on the side panel with the suspension symbol or whatever and it beeps at me with the info light on the dash. Tractor continues to operate fine...I'm assuming it's related to the stabilizer system or something. Usually if I shut it down and restart it, it'll reset and work fine...though the code is obviously still stored. It has been doing it a lot more lately though.

Anyone know the cause of that code...if it's just a sensor, the part number for a replacement and location of the sensor so I can change it out without paying a service tech to make a service call from an hour away?

Also if anyone has any clue on the beeping...I'd love to know what that's all about. Thanks!
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Old 08-03-2011, 09:18 PM   post #2 of 4
jd110
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Default Re: John Deere 6420 - Weird Beeps at Startup but No Error Codes?

Parts number 1 and 2 is for the sensor on the suspended front axle(SFA). The sensor could be bad or the linkage attaching it(#12 or 14)could be unhooked or broken. You also could have a broken wire somewhere between the sensor and the controller. I am thinking that if you get this repaired, the beeping will go away.
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Old 08-06-2011, 02:54 AM   post #3 of 4
s3nt3nc3d
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Default Re: John Deere 6420 - Weird Beeps at Startup but No Error Codes?

Thanks for the info...will definitely look into that. I had issues with the code last year and then it went away. Might just be a bad connection...we shall see.
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Old 11-09-2011, 07:46 AM   post #4 of 4
MightyReek
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Default Re: John Deere 6420 - Weird Beeps at Startup but No Error Codes?

Quote:
Originally Posted by s3nt3nc3d View Post
I've been having issues with our JD 6420 at work that it's never done before... when I first start it (or even just kick the ignition on), it gives 2 short beeps, 1 REAAAAAALLY long beep, and 2 short beeps. No lights flashing anywhere and no error codes when I go into diagnostic mode on it.

It just started doing it yesterday...
That's probably the service alarm.
It you come out every 250 hours (or whatever interval you have at BCU 035).
There are two ways to turn it out:

Make the engine run just over 1500rpm.
Turn the key off and then turn it on again before the engine shuts down.
Repeat it five times and the alarm will be out.

Or just keep working with it, after a few hours it will disappear...
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