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I am buying a used 790 from a dealer, and the one thing that was really ugly on it was the battery terminals. One had a golf ball sized gob of blue green corrosion on it. I asked that after they clean it up the inspect it and if the battery cable was at all questionable (which I was confident it would be), that they put new battery cables on it. They ended up not only changing the cables, but the battery too, put in a brand new JD battery even though it had cranked fine.

I have had pretty good success with putting a bunch of wheel bearing grease all over battery terminals to seal out the oxygen and prevent corrosion. You've got to really work it up into the end of the wire and the underside of the clamp, but my battery terminals stay nice and clean. Keeping the top of the battery clean is also very important.

JD790 Battery Terminal Corrosion - Electrical Problem
John Deere Tractors
Replies 9 Post by tomrscott

denwood:

You make a good point!

1) Which size did you use?
2) Where did you get them?
3) What brand did you find?
4) And what did you pay for them?

Thanks!

Which Hydraulic Disconnects to Use
Operating and Attachments
Replies 13 Post by tomrscott

Yeah, pretty sure. I am reading that number right off of the JD parts book drawing which somebody posted. It shows the couplings to interrupt the power line between the FEL valve PB output and the rocker shaft P input. It brings these out to some rear connections and requires a jumper betwteen them for when you aren't using the rear connections. It would only be useful for a rear implement with it's own oc/pb control valve.

I don't want to hook up that way, but want to use those connections to run to my TNT valve and then put quick disconnects on the four work lines. I might also include a third pair with PB and P also (like the JD kit), but I think I would use a ball valve to bypass it rather than require a jumper hose.

JD MP19826 Rear Aux Kit for 790 Instructions
John Deere Tractors
Replies 3 Post by tomrscott

I am adding a control valve that will have seven ports, four work ports (for two double acting cylinders) and three system ports, the power in (P), power beyond (PB), and return to tank (T).

A couple JD techs have shown me where the hard line is that you remove to get between the FEL controller PB, and the 3pt rocker shaft P. Basically I need to plumb from the FEL PB to the new valve's P, and from the new valve's PB to the rocker shaft P.

That's all pretty clear, but I haven't identified where the return to tank (T) line needs to tee in. There should be a T line from the FEL and probably another from the rocker shaft, but I haven't spent enough time looking at the tractor to figure that out yet.

Was supposed to take delivery yesterday, but dealer prep got delayed, should get it next week. I've "visited" it in the shop a couple of times in the last week. ;-)

Thanks for your help.

Anyone Put MP19826 kit on JD790
Operating and Attachments
Replies 7 Post by tomrscott

I've heard from at least one other guy in a direct email that the selector valve is more expensive than a second joystick and takes more hoses. I guess the more hoses makes sense.

So I guess it is going to be a second 4 way joystick controller, and figuring out the plumbing to add that and the rear auxiliary hydraulic kit. I guess I should be able to run from the power beyond port on the loader controller to the inlet of the new TNT controller, and then from it's power beyond port to the rear auxiliary connections. Then both the new TNT controller's return line and the new rear auxiliary return line have to Tee into the return line from the loader controller. Does that sound about right?

Now I just have to figure out where all of those are and what hoses will be required to set it up.

Top and Tilt questions
Operating and Attachments
Replies 3 Post by tomrscott

Anybody know where the Army Welding link went? It seems to be no longer linked. Did anyone download this that could email it to me?

Thanks!

Learning to weld
Parts and Repair
Replies 62 Post by tomrscott

What kind of warranty does the CNC TNT kit come with?

What would shipping be to Oregon?

And with due respect to Ironpeddler, has anyone here had any experience with these?

Thanks! I'm about to order something and would like to hear what someone thinks.

Best value top and tilt JD790
Operating and Attachments
Replies 18 Post by tomrscott

The drive is an existing road bed that was last groomed about five years ago with only very crude dragging since then.

So maybe the real deal would be a good heavy box blade with adjustable scarifier teeth, and a "top n tilt" option to be able to shape the crown and ditches.

The box blade I am looking at is a Frontier 65" that weighs about 537 lbs. I am quite sure it will dig in just fine. Then the question is whether the rear blade offers any benefit or if the box blade alone will do the job?

Thanks for the help! I finally went ahead and registered for a premium membership because the info has been so worthwhile. Thanks!

Road Crown
Operating and Attachments
Replies 21 Post by tomrscott

To all: So this seems like a pretty useful resource, but he doesn't have a lot of data yet. I noticed that he didn't have anything for a 790, so I sent him a pretty complete set of data for it.

May I suggest that others take a few minutes to fill out a similar table for any tractor they have the data for? If everyone takes a few minutes, we can build up a pretty good source of data that we'll find useful.

If everyone does a little, it's not a very big job.

Thanks!

Tractor Specs online
John Deere Tractors
Replies 5 Post by tomrscott

Just takes twice as long to grade it if you can only go downhill. The extra foot isn't worth it if you mostly do hills and it keeps you from working uphill.

Buying a 790 419 Frontier BB
John Deere Tractors
Replies 15 Post by tomrscott

I am about as new to tractors as you are, but you should be able to keep those turnbuckles from turning and losing the adjustment. One way I've seen is to use a safety wire between one side of the turnbuckle body and some other fixed surface. If the turnbuckle body can't turn it won't lose adjustment. I agree with others that if your links are rubbing on the tires, they've gotten too loose. Assuming they didn't start that way, they've got to be turning.

4110 3 point hitch link
John Deere Tractors
Replies 13 Post by tomrscott

I have a VERY steep gravel driveway/road ~1000' that I need to groom with a box blade. Two wheel drive pickups do NOT visit me unless they walk up the hill! Planning to get a 790/419/ w/ 6' Frontier Box Blade. I have seen several comments on Calcium, but not found a complete discussion of the pros/cons. I have had two dealers recomend Calcium in the tires. Planning R4s instead of AGs for more surface-area/traction on packed gravel. Comments?

Wheel weights for JD 4400
John Deere Tractors
Replies 35 Post by tomrscott