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Hi, Last year I chewed up the pinion and large gear in the front end (the final gears which drive the four wheel drive). I chatted with the JD tech and he indicated that they were having some incidents of this with the 870 and that they were advised that sufficient ballast in the back was...

I was backing my John Deere 790 tractor up to the edge of the pond and ended up in so that water was half way up the entire tractor. After some work, I managed to get out. I checked my engine oil and it looks fine (though I will change it anyway). The hydraulic oil, however, definitely has...

I notice my side panel was lower than it should be, and when I removed it one of the brackets it rests on against the frame was opening up. It is still holding on due to the weld on one side, but the spot weld on the other side is no longer holding (see pics below). Any ideas how to reinforce...

This isn't entirely tractor related, but most of you come up with good solutions, so I thought I would ask. I recently re-acquired an old Stevenson single-shot shotgun that I had when I was a kid. It has literally sat in a cabinet for several decades and has rust all over the barrel...

Does anyone have any long term (ca. 2+ years) report on increasing the hydraulic pressure via shims to 2500 psi? In frequent applications I could use any extra lift, but I have so far been hesitant out of concern that it could degrade the life of the pump. What would be even better is if...

I know this is not quite a tractor question . . . but you guys appear to have really done your homework on the oil issues, so I thought I would ask your opinion on the best synthetic for a 2006 Toyota Sienna mini van. It has 15,000 miles and has one year more of warranty (so I am obligated to...

Interesting Hydraulics Problem Discovered Today I had bought my 2005 JD 790 this June with 33 hrs. on it. It had sat in storage by the prior owner a good portion of the time. Today it was finally warm enough to go out and warm it up sufficiently to change the trans./hydraulic fluid. I had...

I like to follow the recommended maintenance schedule on things I own--except when it clearly runs contrary to common sense. My JD 790 manual is pretty explicit about dumping the coolant AND replacing the thermostat at two years or the number of stated hours. I am not going to change out a...

I have received excellent input from folks on this site, so I thought I would pose the following question in order to gather some collective experience/wisdom: In the spring I am strongly considering adding a backhoe to my 05 JD 790. I am aware of the need for the power-beyond kit, as well as...

I don't mind getting my tractor (JD) really dirty, or even scraping things up in the process of working. But I don't leave it in that state, since there is nothing more burdensome for me than to work on or maintain a dirty piece of equipment (or a dirty car for that matter). I have a bit of...

I recently bought an 05 JD 790 and I build up the hours on it rather rapidly in bursts (projects during breaks). Anyway, about a month and a half ago I did the 50 hour service, and just put the standard JD dino oil recommended at the JD dealer. I am now over 100 hours and will likely be at 150...

For my JD 790, I would like to get a good solid non-oem battery. I have read that Optima makes a fine yellow top. Any recommendations? Best prices? Thanks.

Before I go ahead and order a 790 service manual through JD, I wanted to see if anyone had a used one they would like to sell. It can be paper or electronic--does not matter to me. Mine is a 2005, though I am sure other years are fairly similar. PM me or shoot me a note at...

Hi, I have a 2005 JD 790 with only 60 hrs. on it. Today I went to start it after not running for two weeks and the battery appeared dead. Since it is 3 years old, I pulled the battery, used baking soda and water on all terminals, cleaned everything shiny--including the ground wire to the...

Hi, I have a JD 790 and was compacting soil on a steep hill. This required me going up the hill, pushing in the clutch, and then rolling back down the hill with the brakes on. I had to do this repeatedly on a rather large area of hill. Needless to say, this produced considerable heat in the...