Posted by karl f on July 21, 2009 at 22:39:20 from (172.129.7.49):
I did some research...in the book and inside the tractor. Thanks for the input from everyone a few days ago.
Those with concerns about affecting the tractor like I had, do not worry about it because: a)the differential is lubed from the oil cooler circuit, which will not be affected from this procedure b) there will be a good dousing of oil inside the lift cover while the engine runs, and the remaining oil film coating shoud be sufficient to keep parts lubed while sitting over time. c) there is an added benefit of knowing you have drained ALL of the oil when you drain the transmission housing--otherwise you have to remove the seat, and the draft control cover and take the tall plug out, then put it back, and repeat at the next oil change.
There are 2 ways to do this. The first is remove the front plug as Allen and a few others have talked about. The second is to remove the actual drain pipe in the rear of the lift housing--I opted to do this but also replaced the pipe with a shorter one that will keep the oil about an inch deep, same as the front plug when removed. If you need to remove the cylinder assembly, you may as well remove the rear drain pipe. I decided this route mainly because it can drain off faster than the 1/4" pipe hole the front plug covers and because i had the cylinder out. bc had mentioned observing his cavity filling faster than the small front hole could keep up, and since the cquadrant leaks are from too high oil level, I think the larger drain out the back is the way to go since the oil will be less likely to bottleneck and rise. The rear drain pipe is only threaded on tractors with draft control. For those like bc, without draft control, you could maybe unbolt the plate from underneath and just let it dump out the 5x5 hole, or cut the tube short.
Now that I know how the thing works, I am not scared of this method and I will help recommend this modification to anyone with the 656 666 686 models.
-karl f ps might be good info for 504 and 544 too, YMMV
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