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  1. Some of you will be familiar with the 4586 that we went through and rebuilt in the winter/spring of 2018/2019. If not there is a rebuild thread in the Projects section. You can view it here. The Backstory So, when we first got the tractor up and running last July, the first thing we did with it was hook it to a 25' danish tine field cultivator. We figured that big gal would pull it easy, as all the other tractors on the farm would, that are much smaller than a big 4wd. Well, we were kind of disappointed. Oh it pulled it, but not at speeds we thought it should. Took a long time to recover throttle when crossing ditches or turning around. I really thought it had a lot to do with the fact the tractor had been sitting at least 10 years, maybe longer, before we purchased it, so it stood to reason that the fuel system might have been a little "sticky" inside. Fast forward several hours of field time with 25' equipment and it still had not really "come to life". We had run some fuel system cleaner through it, but did not see many results. One day when I finally got to run it hours on end, I noticed that the vent on top of the fuel tank cap was covered in dirt. I thought it odd. Next time I stopped, I took the lid off and almost couldn't pull it off under the vacuum. I thought, "Ah-ha!! Found the problem!" Well.... a new fuel cap did help. But, no.... it still was a dog. Mind you there was no visible signs this thing had any kind of fuel problems. No excessive smoke of any kind. Black or otherwise. It just did not have any power it seemed. We all did some research on the problem. Talked to guys who ran these machines years ago and no one said they had low power like we were experiencing. Matter of fact, a lot of them were running up to 40' field cultivators on 4586's and said they pulled them fine.... yet here we were with 25' tools and struggling. 150+ hours were put on the clock and season was over. Put it to sleep in the shed and winter set in. New Findings The water pump was loose we noticed, and noisy, back when we rebuilt the tractor. A replacement couldn't be found, so we ran it that season and hoped to make it until winter when it could be pulled off and sent out to be rebuilt. We dug the tractor out and put it in the back corner of the shop in around January this year. Pulled the pump and sent it off. It took around 4 or 6 weeks before we got it back. During the install, two of the guys were putting things back together and one of them just happened to notice some light oil film lines on the compressor housing of the turbo that were running up. Up?? How can oil run up something in an engine compartment with all that air from the fan blowing back? They hollered at me (I was working on the 9330 we had just gotten) so I went over and they pointed it out. We got a ladder and climbed up. There in the intake manifold was a small approximately 5/16" hole just below the compressor housing on the turbo. I stuck my pocket screwdriver in it and it never hit bottom! There was an open hole in the intake manifold! Looked it over really well. No signs anything had been removed. Matter of fact, it kind of looked like nothing had ever been in it. We found it to be an 8th inch pipe hole, so we screwed a plug in it. This plug would have been behind the original brace work for the stack that came out of the hood that we removed when it was converted to a side stack. No way anyone could have accessed this hole without a lot of trouble. I do kind of recall seeing it during turbo removal, but didn't really give it much thought. Figured it was a mounting hole for some accessory in a different application. After all, the DV800 was in a lot of other applications. A Whole New Tractor When the time came to finally put it to the test this spring, we found a new tractor again. It was put on the first tool it ran back in July of last year. We were able to go up another gear, which on that tractor, is a big jump. We can now pull that same tool over 7mph, and if you throttle back to the nearly idle speed of 1000 RPM, you can leave the tool in the ground and throttle back up. That is what we had expected out of a DV800! Poor thing was losing quite a bit of boost with that hole in the intake! Funny thing was, she didn't smoke. Just a very light hint of black when under load, which we figured was pretty normal from an engine of that era. The old diesels didn't make near the boost pressure of the newer engines. Several of our tractors push light black smoke when loaded. Closure Late the other night after finishing up and heading home, something happened. Either a tire kicked up a rock, or a small bolt in the fan shroud came out. Either way, the fan grabbed something and threw it into the radiator. Pencil lead hole spraying coolant everywhere. Put the tractor in the shop and went to work pulling that massive cast iron tank, copper core radiator out. During the work, I dropped a nut. Never saw where it went. Got a magnet out and went searching in the forever deep V between the heads on that 800, under the injection pump. Pulled my magnet out, and what is that?? Some rusty chuck of something on the end, but wasn't a nut. Wiped it off with a rag..... There it was! A 43 year old rusted to nothing 1/8" pipe plug! So now you all know, the rest of the story.
  2. Just wondered how much he a spicer trans will handle in ih 4586
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