2021 John Deere 9620RX sets multiple communication faults and speed is de-rated to 6 mph. 

What a great customer, 19 hour machine broken and he is not going crazy. Lucky for him you were on the job, highly skilled, determined to fix it and got the job done.

Way to go, JD engineers. Two boxes, same part number, different boxes. And the customers new machine is down for two days.

This IS why I absolutely hate the new stuff of today. I know everything is getting pushed to go electronics but, this proves my point about that. The old equipment was and still is so simple and easy to fix. Great video. Cheers :)

As an industrial electrician of 40 years experience I can fully appreciate the frustration off a fault like that. It must have been so satisfying eventually finding that, well done 👍. Strange thought when the wire wasn’t even fully broken. Bet you weren’t looking forward to replacing the wiring loom if that hadn’t fixed it!

Worked on a CAN bus problem on a CT patient table and found a very bad chassis ground splice/star point. Drove us crazy for 2 days. CAN bus hates bad grounds and once fixed, we got flawless operation. Great video!! Thanks!!

As a automobile master tech, I can state can lines can be quite tricky, you can have one strand left in the wire, and still have perfect ohm readings until you hit a bump on the road, in most cases I run a temporary CAN wire outside of the harness between the two points of failed communication to save time finding the problem before judging modules. Great job. Love your videos.

Hey I’m a Deere Road tech up in Sask Canada, I love that stubby impact and fluke meter. Your videos are awesome, good work man

I hate intermittent CANbus faults. Drive me nuts. Techs usually says it's got to be in the programming. I tell them to check the wiring because if it's in the program all the units would have the problem. A few hours later they tell me they found the issue. It was in the wiring. Usually a pin that was not seated or a wire like you found. Keep up the good work, I enjoy the videos

That’s one clean, well equipped service truck. That was one of those jobs. Customer needs to work, parts take time, intermittent problem. About half way through I said, “ oh well at least it isn’t raining “ lol

In my first job/career, I performed customer field service work (office automation equipment) and during the 14.5 years i did that, I had two similar issues of replacing everything that myself and Tech support could think of and it ended up being pinched wire on one and an intermittent pin contact in a harness on the other. The fix in both cases was very simple but, finding both issues was a nightmare to say the least. After that experience, I stopped assuming it was always the big items and started looking for simple comm issues first. It served me well.

I started playing Farming Simulator 22 and now RU-vid is recommending your videos to me like crazy and I find it very interesting. The degree of realism in that game is amazing when compared to the real thing.

Sometimes diagnostics takes trial and error. I work in computer repair for the past 10 years. Cannot tell you how many times I have had still things like this. You are chasing your tail for 2-3 days in a row till you finally find it. But damn nice find. Single wire caused you all that headache. I once had a single wire on a power supply that was not plugged in all the way. You walked past the computer and the damn thing would turn off

Had a 1770nt planter that kept crashing and rebooting the planter controller. Didn’t crash anything else just the planter controller. The tech and I were working on it for something like 5 hours checking literally everything. Finally narrowed it down to the wheel speed sensor on the planter. Put a different sensor on and everything was fine. It was a wire on the sensor that was rubbed through the insulation grounding out on the frame intermittently causing the controller to crash. Extremely frustrating. Intermittent wiring issues can be the hardest to diagnose and repair. Good catch finding that bad wire! Wiring harness quality control is not something to be taken lightly.

Great work. Good to see how you're able to cooperate with your customers!

I've troubleshoot CAN buss issues - they can be tough - great job!!!

Good job, those types of faults are a nightmare to fix.

Persistence pays off. Hope the customer was understanding and happy to finally get her back. Good job.

It's usually the simple things that turn out to be culprit...been there, done that. It's frustrating, but still pays the same. Cheers, brother!

Fantastic video, I glad the people who made that wiring loom don't work for the aircraft industry, terrible wiring,

Great job finding the issues. That could get old in a hurry

Oh right on! Good find! Some tractors are just like that! Surprised you could send the farmer for parts, here is Southern Manitoba were I worked at a ag dealership (not a Deere dealer) we always did that ourselves unless it was a older tractor but never on a new new. Interesting how things are different in different places. Great video, keep it up!!

I would love to see a service truck walk through. I'm a john deere field tec as well. It's always cool to get ideas from other tecs on organization and tools to have. Keep up the good work!

You have the look of complete satisfaction at the end of this video!

Nice job Zeth! Sometimes just the smallest thing can cause huge problems.

I had a wire like that on a 790 last fall I got lucky though and found it quickly but I have definitely had to chase problems like that when you are just about ready to kill something then you find it great video

Sandvik drill Tech , had a CanBus issue also that was interesting, Can low wire had rubbed through against frame of drill causing Can low in backbone circuit to ground . Went to know connector points to install bridge cable and the first wire I put my hand on was the wire with the copper exposed on the rubbing part of that cable just at the connector, luck of the Irish!!

"The more complicated the plumbing, the easier it is to gum up the works". Lt Commander Montgomery Scott Chief Engineer USS Enterprise

LOVE THES VIDEOS! 10 year jeep tech and i had something very similar not too long ago with a communication would drop out for a split second. very frustrating to figure out

Great, patient troubleshooting

You do a great job, but I have to admit, I am saddened by the many problems you are seeing on new and newer machines.

They used to make wonderful tractors

A $500,000+ machine with 20 hours useless for 2 whole days time is money great quality control John Deere !

One little wire shuts down the operation....amazing!

High fault counts equal connection issues. loose pin terminals, broken wires etc.

I’m former truck engineer who moved on to transport refrigeration units and those CAN-modules are pain in the butt to troubleshoot. You can only diagnose everything else and if ok, replace the module and pray - and customer will pay and cry. Did you have to put back the modules you replaced that were ok? I’d imagine so as it’s a warranty job. Anyways really interesting to watch the repairs, subbed!

From a fellow tech I enjoy the videos keep up the good work

I can empathize with your frustration. These kind of issues are terrible to deal with

I'll tell u what amazes me with this technology today is that a database isn't set up for the field tech to look at the problems, solutions and the hits for each problems along with d tech to cut downtime. Like this video on that pink wire almost cut thru. That tells me it is the wire harness quality issue when built and should have been tested for shorts, vibration, salt water ,freeze and so forth .

In my experience working at the Volvo truck dealer, OEM wiring troubleshooting steps for both Volvo, MACK & Cummins are wildly inadequate, guys who follow them often end up needlessly replacing modules & smart devices because their troubleshooting led them to no fault found in the wiring; which is less of a problem when you can get warranty to foot the bill but when its starts coming out of the customers pocket it get's ugly. In cases that are not immediately obvious I've had a lot of success isolating the harness, load testing the powers and grounds to each module in question, isolating the CAN line between connectors applying an alternate power and ground with a load in place, typically an incandescent bulb and wiggling the harness. A single conductor inside the insulation will give you good resistance but will not carry a load, while the serial data messages do not load the circuit per say, a nearly broken wire like you found, or a loose female terminal creating intermittent contact will absolutely wreck the traffic on the network. Good find, nice to see guys getting after it in the field.

Blows my mind a brand new tractor can have so many issues

What a nightmare. I had a Cat 745 one time that would crank and crank and had injection disabled. On the the third day of t/s, found a ground that was barely loose. Had half the cab torn apart for it

👌good job finding the bad can wire!

That’s a good find. Can lines always cause some crazy issues

👍👍👍you are the man with the right attitude never give up 👌

glad I found your channel. I've watched a few of your videos. One thing strikes me as a little strange. Most everything I have watched you repair seems to have wet paint from the factory. Wut up with that. I can't imagine buying something that expensive only to find myself sitting in a field somewhere on the phone troubleshooting codes. Cheers from Louisiana.

These tractors are far to complicated they will develop so many faults has they age they will have no secondhand value

Crazy complicated and delicate. Arguably planned obsolescence.

i come from germany and i did the same job as you. i have been out of the job for 20 years. In my day it was unimaginable to connect a laptop to a tractor. Today nothing works without it, it seems to me

Great video, I've been an aircraft electrician and avionics technician since 1978. I've run into your little problem many times! Cut wires aare a bitch to find. Have your shop invest in a megger. It's a megaohmmeter. It shoots 50,000 volts down a suspect wire and it then reads the resistance oof that wire. High resistance, you only have a couple strands of wire . It'll ohm good but won't pass a voltage thru it. A Fluke meter only sends about 5vdc thru the wire. You have to have both ends disconnected from electronic devices or you'll nuke them. 3 kinds of wire problems, short, open, or a few strands. A Milliohmmeter would be good to have too! That reads milliohms to check your ground connections. A fluke can't read that low. Have fun.

Looks like Dear John breaks the same in the states as it does in Blighty haven’t worked on a big plant but small ones had been giving enough trouble Anyway enjoyed your videos ever so easy to work with the dealer equipment Well swapnostics sometimes only way to figure it out Well to say cars giving enough trouble as well You take care and all the best

With the greatest respect to you sir it’s a sad state of affairs that you cross your fingers a lot. Which reflects on JD not your good self.

Nice detective work keep them coming.👍

It seems like lots of the new large John Deere tractors have some pretty major problems. Is this common? What about other manufacturers, do they too have lots of problems with the new equipment also? Too bad there is all this electronic crap in everything now days.

Another good show

Nice job some of the stuff is hard to find though.

“But… but… but… the computer tells you what’s wrong with it so why do you charge a diag fee?!” as I was told 5438.3 times in my career as an auto tech.

That was a head scratcher. Nice job

Yowza! You are tenacious!

That's the toughest part of being a tech facing the customer. They on the hook for getting the crop in the ground. They got million dollar investment.

I love john deere tractors but lately they seem to be having a lot of issues and these big tractors are super expensive to begin with

Damn even i got frustrated cant imagine how you have felt. LoL. What happens to me often is that when things looks like its complicated and i cant figure it out, it end up to be something very simple and easy which i didnt thought about. Than i slep myself on the forehead like: How could you not have come up with it earlier

Having SO Many break downs gets you techs VERY familiar with the tractor innards. I am NOT impressed with JD. Probably all the other brands are intha same boat. THanks

Nice job your videos are sick man

Huge respect though I’ve watched some of your other videos and some of those parts you change are huge and I’m sure are ungodly heavy

Great job. Unbelievable strange 👍fault. 👍👍

First I don't work in Ag or on tractors. I watched this video and was wondering. Does the tractor owner have to pay for the different boxes and use of a new tractor from the dealer. Farming has to be very expensive maintaining those huge tractors. Great video.....

And that, friends, is why you purchase an original, not a copy.....🤣🤣🤣 Glad you got it figured out though!!

Wow. What a saga. Frustrating in a new machine. Now picture the same machine in Outback Australia away from the internet, a workshop nearby, replacement machines, quick parts and the US field support. Supersizes frustration.

JD needs a fleet of parts-flying drones

Can't wait till the start using fiber optics for CAN bus

If that tractor was not under warranty, what would the bill have been? $5k+ easily.

What I find funny is that that huge tractor uses the same ignition key as my 3 series.

Nice good find. That's bad workmanship on an employees part from what I can see. Never should fold a wire lol

GREAT VIDEO.. I'm surprised that you didn't need to solder the broken wire... Good find.

Good find 👍

Came off the manufactures floor that way

Did this happen by the electrical posts by the road? That wire would prob pick up disturbance from any electro magnetic field it would encounter. Happened to me with a car (bmw) I worked on years ago.

Love the videos....except the loud music just all of a sudden l 👍

those are the "FUN" jobs ; you test correctly .... but that last little strand or 2 fools the meter easily .... we dont have Xray vision

That wasnt an intermittent problem, that was a recurring nightmare problem

I’ve had continuity/resistance checks mislead me before the wire was showing .3 ohms but it will still have continuity even if 1 or 2 strands are still connected I do not work tractors but I’m sure the can lines have small voltage between the high and low lines I wonder if it would have shown a voltage drop comparing the 2 lines

the one big problem with that plastic tubing is it rubs in the riges its a crap way of doing it . you get the same problems with air con units where it vibrates . the same type but made out of metal . then ribs are the problem . you need smooth piping to cure that problem .

I think your service manager needs to get you a flow meter. Just as important as a multi-meter.

I wonder how you make repairs. Love the diagnosis. Does Deere has their own approved wire splices or does Zeth have HIS ? Eric O working on salted cars shows us what he uses. Sells them too. You work for a humongous company. Thatsalota Deere.

So, in the end did you put all his original components back on since everything should have been working correctly in the first place? I thought from the beginning that there has to be a loose or broken wire. That is the only thing that would cause this kind of issue. Throwing in a ton of components at it and still doing the same thing just proved it. Good find!

There you go the Deer screws itself instead of the customer !

Whoever it is in manufacturing that identifies three different, incompatible items with the same part number needs a good slap.

I would have first checked the flux capacitor. They go bad all the time in these new rigs.

All that work only to find it was 1 damaged wire but with the mess of wires and tech on equipment these days you never know if it's going to be a simple 5 minute fix or a fix that could take several hours.

I’m in school at Vincennes university to be a John Deere tech but I won’t ever work on anything this big I’m from east central Kentucky and all we work on is lawn mowers to 6 thousand series

Imagine paying half a million dollars for a new tractor and 19 hours later it’s broke down for 2 days. Like how does that happen??

How were they able to tell that it was the wrong steering box?

Hey man, great videos. What tools would you say you absolutely need at a JD service tech. I’m about to go work for a JD store and just curious to see what you recommend. Thanks in advance!

Well done my friend. Sam we go to true north in Kennedy minn.jd dealer.sam

Excuse me for asking. If the tractor is so new why the ffff aren’t JD out there busting a gut to repair it under warranty?????

Great vids

Good good..... Dirkie south afrika

Why did you have to blur your tool?

Can you still buy a mechanically injected tractor that doesn't come with all of the electronic gremlins and emissions equipment? It seems like they would be a lot more reliable if you were willing to turn the wheel and shift the gears yourself.

I'm sure the owner was starting to get impatient with his expensive tractor not getting any work done. Even the new stuff has problems.