Hello from North Carolina

blasley · Aug 11, 2016

Hi All,

My name is Brian and I'm from Greensboro NC. My wife and I are in the process of building a home on 6 wooded acres with a long (800 foot) gravel driveway. I am an engineer by degree and enjoy the outdoors, camping and hiking, and my hobbies are welding yardart and trying to learn blacksmithing.

I have just purchased a 2000 JD 790 which needs a few repairs so I was hoping to find some tips here to help with that. If anyone as any experience with a dashboard that has illumination lights and a working tachometer but the warning lights and gas gauge as well as the temperature gauge not working Id appreciate your knowledge. I haven't even started to check the fuses yet. I just ordered an operators manual and I might try and find a service manual to help me as well.

The sway control on the 3 PT hitch arms needs work as well as I think they are frozen with rust and not properly adjusted because the scrape blade hooked up to it made the arms hit the tires.

One of the hazard flashing lights isn't working so I need to figure that out.

So that's whats going on here. I've read several threads on here and have found much knowledge already. I hope I can contribute some of what I find out as a first time tractor owner.

Thanks

Brian

Wagtail · Aug 11, 2016

G'day Mate and welcome to TBN from Downunder.

Enjoy the site... someone will be along to advise you shortly (we're a helpful bunch here).

mguitas · Aug 12, 2016

:welcome:

TBN Support · Aug 12, 2016

:welcome:

I'm going to move your thread over to our John Deere section to see if we can find you some answers.

JFoy · Aug 12, 2016

Hey Brian,

I'm a Kubota guy but I'm over in Clemmons, south of Winston-Salem.

Welcome,
John

SDiver40 · Aug 12, 2016

Hello and welcome from Concord

fixitman123 · Aug 12, 2016

Welcome Brian from Garland in SE NC!

beenthere · Aug 12, 2016

Welcome, and some pics of what you are asking about will help with some suggestions. As will the service tech manual when you find one. Mine covers the 790 so may be able to answer some questions or post some schematics, etc.

Walt 2002 · Aug 13, 2016

Welcome,

Walt Conner

blasley · Aug 13, 2016

Hey I found out what the issue is with the electrical. There was a 3A fuse that was being held into the fuse block with some wood slivers and small metal strips because the spring contacts in the fuse block were broken off. I pushed it back in and the warning lights and gauges work fine now. I'm afraid its temporary because it will most likely vibrate loose at some point without being able to replace the contact on the wire in the fuse block.

I took the sway adjustment off and got one end on both of them broken loose but now I'm trying to figure out how to break loose the other end without messing up the threads. I got one end loose on one side then in the process the other end broke loose but I got the initial end freed jammed and can't get it back out. Im still figuring that one out. If I can get the threaded rod out I think I can replace that part without ordering it from JD.

Thanks for any help you can offer.

kebo · Aug 13, 2016

blasley said:
Hey I found out what the issue is with the electrical. There was a 3A fuse that was being held into the fuse block with some wood slivers and small metal strips because the spring contacts in the fuse block were broken off. I pushed it back in and the warning lights and gauges work fine now. I'm afraid its temporary because it will most likely vibrate loose at some point without being able to replace the contact on the wire in the fuse block.

I took the sway adjustment off and got one end on both of them broken loose but now I'm trying to figure out how to break loose the other end without messing up the threads. I got one end loose on one side then in the process the other end broke loose but I got the initial end freed jammed and can't get it back out. Im still figuring that one out. If I can get the threaded rod out I think I can replace that part without ordering it from JD.

Thanks for any help you can offer.

View attachment 477454

Hi Brian, welcome to the forum! I also have a JD 790 and love it. I can probably help out with some of your questions. As for the adjustment links on your sway bars, it might be best to replace the one that's frozen. The threads on it look like they are pretty well boogered up anyway. Once you get them figured out, raise the implement and adjust the links so that the implement is centered behind the tractor, and has minimal movement side to side. Once they are adjusted correctly, make sure you put the little pins back in them so they won't move out of adjustment. Believe me, they will move too, without that little pin to lock the threaded shaft in place.

Does your 790 have the loader on it? If you do, most likely it's the model 70 like mine. If you have it, there's a little trick you can do to safely increase the hydraulic pressure and get a little more lifting capacity on the FEL, and on the three point lift as well. It only costs a few dollars, I did it to mine several years ago and have not had any problems with it. Something you can consider if you want too. Anyway, good luck with it.

joecdeere · Aug 13, 2016

Welcome Brian, those will be a lot easier to break free mounted back on the tractor, heat the frozen end up with a propane torch and touch it with some bees wax and let it cool, works almost every time. Remember one end is RH thread, the other end is LH thread.

If you shoot me your email, I have a PDF of the technical manual you're welcome to, I'm on vacation for a week, but will send when I get home next Saturday

blasley · Aug 13, 2016

Hi,

Thanks for your suggestion about the sway links. I'm trying to determine how to free the other end. I was thinking of welding a nut in the middle and using a wrench to grip it since its buggered anyway. It does have the Model 70 loader. Its missing the rod on the RH side of the tractor to take the loader off. I'd like to know what you did. Thanks

Brian

blasley · Aug 13, 2016

Hi joecdeere,

Thanks for the tip. I'll try that. I'd appreciate the manual too. I have some bees wax since I've gotten into blacksmithing a bit.

Brian

blasley · Aug 13, 2016

I forgot my email address. It's lasleyb@asme.org. Thanks again.

Brian

kebo · Aug 15, 2016

blasley said:
Hi,

Thanks for your suggestion about the sway links. I'm trying to determine how to free the other end. I was thinking of welding a nut in the middle and using a wrench to grip it since its buggered anyway. It does have the Model 70 loader. Its missing the rod on the RH side of the tractor to take the loader off. I'd like to know what you did. Thanks

Brian

Not sure what you are asking there? If the rod to unlatch it is missing on the RH side, you'll either have to purchase a new one (should be available from JD for lots of $$$$), or you can see about fabricating one. I would opt for the latter, if it were me. It doesn't seem to be very complicated or difficult.

jenkinsph · Aug 16, 2016

blasley said:
Hi,

Thanks for your suggestion about the sway links. I'm trying to determine how to free the other end. I was thinking of welding a nut in the middle and using a wrench to grip it since its buggered anyway. It does have the Model 70 loader. Its missing the rod on the RH side of the tractor to take the loader off. I'd like to know what you did. Thanks

Brian

A large pipe wrench should be able to break the threads free. Then chase the threads inside and install new rods. If you had the proper nuts for this you could try double nutting together and see if that will free the rod.

blasley · Aug 20, 2016

kebo said:
Not sure what you are asking there? If the rod to unlatch it is missing on the RH side, you'll either have to purchase a new one (should be available from JD for lots of $$$$), or you can see about fabricating one. I would opt for the latter, if it were me. It doesn't seem to be very complicated or difficult.

I was referring to how you increased your lift capacity for the FEL and 3 PT arms. Was it something to do with shims? Thanks

Brian

kebo · Aug 21, 2016

blasley said:
I was referring to how you increased your lift capacity for the FEL and 3 PT arms. Was it something to do with shims? Thanks

Brian

Yes, you can add shims to the relief valve and it will increase the hydraulic pressure by a modest amount. You will need a 0-3000 PSI pressure gauge to check the pressure before and after shimming it. Just don't go over 2500 PSI. The factory setting is supposed to be 2050 PSI.

Here's one of the many threads on it. Scroll down and you will see a pic of the JD shim kit with their part number on it.

http://www.tractorbynet.com/forums/john-deere-owning-operating/231046-790-3005-hydraulic-shimming.html?highlight=shim+790

Here's a pic of the gauge I bought from a local hydraulic repair shop for less than $30. The gauge was like $20, and the quick connect fitting was a few more dollars.