Questions about John Deere 790

[loggin]

My thoughts exactly

I think it’s the implement design, not the width that’s the problem. When I shopped for my 8’ blade I wanted one that was designed to be rotated 360 degrees without touching the tires. Some brands couldn’t do this, while some were built for 360 rotation. It’s how long the mounting beam extends from the 3ph. The cheaper brands and models couldn’t be rotated 360 degrees.

My thoughts exactly. The blade I have does not allow the cutting edge to get near the tires. It also rotates 360 degrees.

 

[Reddogs]

My thoughts exactly


My thoughts exactly. The blade I have does not allow the cutting edge to get near the tires. It also rotates 360 degrees.

I never said anything about the blade, its the whole implement that swings and the sides with the links "scrape" the tires which does the damage.

 

[RoyJackson]

I never said anything about the blade, its the whole implement that swings and the sides with the links "scrape" the tires which does the damage.

You can try tightening up the anti-sway chains...best done when the blade is off the ground somewhat.
However, as any 790 owner knows, those chains still allow a degree of sway.
I used a 5' blade...even then I never angled it all the way

 

[jyoutz]

I never said anything about the blade, its the whole implement that swings and the sides with the links "scrape" the tires which does the damage.

That has nothing to do with blade width. It has to do with your hitch adjustment.

 

[marhar]

You can try tightening up the anti-sway chains...best done when the blade is off the ground somewhat.
However, as any 790 owner knows, those chains still allow a degree of sway.
I used a 5' blade...even then I never angled it all the way

It sounds like you have identified the root of the problem. One must have a little "play" in the chains (or they will snap or worst) but the sway should not be so much that an implement can rub the tires on either side.

 

[RoyJackson]

It sounds like you have identified the root of the problem. One must have a little "play" in the chains (or they will snap or worst) but the sway should not be so much that an implement can rub the tires on either side.

As I'd written, early on in this thread, I owned a 790, so I know the good points and the not so good points
Great little tractor, except for the limitations of the non-synchronized transmission.
I replaced it with a Deere 4400 with a 12 speed reverser transmission

 

[loggin]

I never said anything about the blade, its the whole implement that swings and the sides with the links "scrape" the tires which does the damage.

My apologies Reddogs for misunderstanding but I am still a little perplexed..

Are you saying that the category 1 three point hitch is too wide for the JD790 to accommodate between the rear wheels??

 

[Reddogs]

My apologies Reddogs for misunderstanding but I am still a little perplexed..

Are you saying that the category 1 three point hitch is too wide for the JD790 to accommodate between the rear wheels??

No, that a 6ft one on a 790 is just too big and heavy for it to keep it from swinging on the turns and scraping the wheels...

 

[Reddogs]

It sounds like you have identified the root of the problem. One must have a little "play" in the chains (or they will snap or worst) but the sway should not be so much that an implement can rub the tires on either side.

Hit it right dead center...and my hands are raw from tightening it to say nothing of my patience...

 

[Santarick]

I just purchased a beautiful JD 790 4x4. The tractor only has about 400 hours and came with a loader but no other attachments. I first want a back blade as I am going to be grading driveways. I was just assuming I should buy a 5' size since it is just wider than the rear wheels. But would 6' be better since this is in fact a 30hp tractor? I think my little 20 horse Yanmar had a 5' blade.

I'm looking for recommendations on rear blades and box scrapers. It seems inventory is kind of thin right now. The high quality, heavy rear blades seem to be out of stock in my area. Apparently Land Pride is 9 months out or something, according to the dealer.

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[950deerehunter]

My apologies Reddogs for misunderstanding but I am still a little perplexed..

Are you saying that the category 1 three point hitch is too wide for the JD790 to accommodate between the rear wheels??

Click on the link in Reddogs #19 post. You can see tire marks on the 3-point lower arms. This is a flaw in the tractor design which is exacerbated by any implement that might impose a side force such as a blade at an angle.

 

[Reddogs]

Click on the link in Reddogs #19 post. You can see tire marks on the 3-point lower arms. This is a flaw in the tractor design which is exacerbated by any implement that might impose a side force such as a blade at an angle.

You got good eyes, yep thats a major flaw in my book..

 

[pretendfarmer]

Click on the link in Reddogs #19 post. You can see tire marks on the 3-point lower arms. This is a flaw in the tractor design which is exacerbated by any implement that might impose a side force such as a blade at an angle.

The same thing would happen on my old Yanmar 4x4. Not surprising this is basically a Yanmar, too. Oh well, I got a lot of good use out of the tractor despite that flaw.

 

[pretendfarmer]

As I'd written, early on in this thread, I owned a 790, so I know the good points and the not so good points
Great little tractor, except for the limitations of the non-synchronized transmission.
I replaced it with a Deere 4400 with a 12 speed reverser transmission

I was a bit bummed this 790 didn't have an HST trans, but the price was right so I bought it anyway. My next tractor will definitely be an HST. I'll add her picture here, too:

 

[tacticalturnip]

It's interesting that the 790 and some related machines are about ubiquitous here in rural Maine, or certainly were a decade ago, and I've never noticed the marks on the 3PH. I just hopped on TractorHouse and most of them have that rubbing!

 

[jyoutz]

It's interesting that the 790 and some related machines are about ubiquitous here in rural Maine, or certainly were a decade ago, and I've never noticed the marks on the 3PH. I just hopped on TractorHouse and most of them have that rubbing!

Maybe wheel spacers?

 

[tacticalturnip]

Maybe wheel spacers?

If that's the fix then it's a well guarded secret.

 

[950deerehunter]

It's interesting that the 790 and some related machines are about ubiquitous here in rural Maine, or certainly were a decade ago, and I've never noticed the marks on the 3PH. I just hopped on TractorHouse and most of them have that rubbing!

i was just thinking that if the 3 point hitch is empty the lower arms would be free to swing into the tires if they weren't bungee corded together.

 

[jyoutz]

If that's the fix then it's a well guarded secret.

Why wouldn’t that allow for more space?

 

[tacticalturnip]

Why wouldn’t that allow for more space?

I'm not saying it wouldn't, given that's the point of a spacer; I'm was just making a joke implying that the Deere 790 community must be unfamiliar with them.