OK, it was last October when I brought this problem to your collective attention but I finally got around to delving into it this past week. Warm weather makes a big difference in my motivation.
Initially, I fired it up, put the back wheels off the ground a bit with the stabilizers, popped it into fourth and then shoved the shuttle lever into forward. I left it run like this for about 45 minutes at around 1000 rpm so that all the oils would be nice and warm.
I then used the bucket and stabilizers to jack the entire tractor as high as it would go off the ground to make it easier to work on. Armed with a 1" open/box end wrench and two plastic 5 gallon pails, I noticed one drain plug just behind the engine itself, in the bell housing area. I figured that this was the one so I undid it and let the oil fall into one of the empty pails. About all I got out was 2 to 3 quarts.
That surprised me but since the tractor was on a pretty good angle to the rear, I figured that I had to open the next drain plug about a foot back from the first one. More oil came out but once it quit, the bucket was perhaps 1/3rd full at best. That really had me scratching my head because I expected more than 5 gallons. So back under I went again and found a third drain under the differential. This time I used the other empty pail. Good thing I did because the contents came real close to filling my bucket.
It was immediately obvious that the greyish crap that came from the last drain hole was totally different in viscosity to the oil from the first two drains. So, off I went to my local Case/New Holland dealer five minutes down the road. After considerable discussion with the Service Manager and the Parts Manager, it was decided to use the Case HyTran fluid everywhere since this was an old 580B and if a leak developed internally, no contamination would result.
After all, this unit has been permanently retired to occasional duty around the farm. No one's making their living from it and it rarely gets roaded anywhere. Armed with a new $20.00 filter and two pails of HyTran at a cost of about $210.00, back I went to the yard. The filter housing resides in front of the rad on the left side. Four bolts to take out with a 9/16" socket on a ratchet and the filter got changed. Just have to make sure that all mating surfaces are 100% clean and that you place the O-ring correctly.
I used some chassis grease to hold the O-ring in place the first time and the **** thing leaked on me. Pulled the top off, cleaned everything meticulously before putting it back together and that solved the leak issue.
One full pail of oil went directly into fill hole just behind the shift lever before the level was high enough to reach the notch on the stick. My SIL was under the impression that this was the hole for the shuttle. WRONG. After scraping about an inch of crud off the top of the transmission housing in front of the shift lever, I discovered a second fill plug. After washing this area clean with solvent first, I then opened up the fill plug and began adding oil from a gallon jug that I was filling with oil from the 2nd pail of HyTran.
Too hard to use the 5 gallon pail in this area because that fill plug is right up by the dash. It took around three gallons of oil to reach the mark on the dipstick. After checking everything for tightness, I started up the tractor and checked for leaks. That's when I dealt with the leaking filter housing mentioned above. Once that little problem was looked after, I dropped the tractor down to the ground and took it for a spin. What a difference. Put it into fourth and had no problem taking off at road speed. Put it into first gear and waded into a pile of topsoil dumped last year. Pushed right through that pile with no problem.
I am so pleased that this was nothing major.
If it had been the shuttle, I doubt that my SIL would have wanted to spend the money to have it repaired. Thanks to one and all for the help given last fall. I'm going to make sure that the SIL keeps on top of these maintenance issues from now on. He's just as bad as his father is when it comes to looking after machinery.
It'l be a struggle but I think that he can be trained.