No limited slip on 919 rearend

[Michiganmobileman 0]

Hello to all, Well this was the weekend for me to get back to work after 6 weeks of recovery. I was the cutter and my wife and sister in law (brother still in Iraq :() were the loaders. By the time I ran the saw out of gas and looked at the wood they had stacked on the trailer I figured the 919 would have to work a little to get to the wood pile. Started her up and inched the drive lever forward. One rear tire spun, was able to wiggle back and forth in seat and got other side to spin then but not at the same time. Ended up getting the chevy truck involved as i had loaned my 712H to a friend for mowing purposes (should have seen her smile with 2 acres to mow and only a push mower). What is the most likely cause, any exterior adjustments to this limited slip or am i looking at pulling the diff apart. Thanks to all Greg

[HubbardRA 19]

There are no external adjustments on the limited slip units. The only way that I know of to tighten those units is to shim the springs in the diff to produce more friction. I have one that I shimmed with washers. I also have a couple others that spin one wheel rather easily.

[ambler 0]

I think the limited slip is working, you need more traction, i.e. weight

[Tom Deutsch 0]

I had a similar problem while mowing with mine. If the uphill wheel was onslick grass, it would just spin without transferring power to the wheel that was just sitting there (plenty of traction, no juice). I was ready to break out the manual and bust a knuckle trying to do an "adjustment". But if I read the replies correct here, it's "working" when one wheel spins? I thought limited slip was when one wheel was spinning, the other wheel would get some power. ????

[Michiganmobileman 0]

Thanks Guys, But I had a trailer load of firewood hooked to the tractor and should have had plenty of weight and traction. May try simulating conditions when i get home tonight and see if more weight makes a difference or not. Greg

[HubbardRA 19]

Limited slip is not a fancy load-transferring differential. All limited has is basically a friction brake on the spider gears which turn when one wheel tries to go faster than the other. This keeps both wheels turning in very low traction conditions like on ice or in sloppy mud. If you are in a condition where one wheel has plenty of traction and the other has very little, it is very likely that you will spin the one with little traction. This happens when the torque going into the spyder gears becomes greater than the friction trying to prevent spinning. Once the force becomes higher than the friction the wheel spins freely.

[Michiganmobileman 0]

Thanks Rod, I almost wonder if I had TOO MUCH weight on the trailer tongue, should of taken a picture. I was basing this on my experience this winter with the 712H plowing snow. Many times both tires would drive at the same time. Did your washer shims make much of a difference, worth the time and effort? I will eventually be tearing this tractor down for a recondition, hopefully this summer, and figured that would be the time to get into the diff if needed. I hope to use this tractor mainly in the garden and plowing snow (until I get a snow blower then I will be blowing snow with it:D) as it is almost too big of a mower to get around some of the spots in our yard. Thanks to all, Greg

[ambler 0]

I used to use my 7112 to tow a camper trailer. lots of tongue weight and the front end would rise off the ground. I would have someone jump on the front for steerage, but it would never stop also surface wasn't slick like yours. Camper was 5000 with 350 lbs on tongue.

[HubbardRA 19]

Greg, Yes the shim washers made a tremendous difference. We have only had it stop once with only one wheel spinning. That was when dragging a telephone pole on a grade going from left to right. Upper wheel spun. As I said before, any of them will spin one wheel if the right conditions exist. The only way to stop one wheel from spinning is to lock the diff. That is easy to do, but they don't turn well with a locked diff. Been there, done that. Here is a picture of what was being pulled the one time that we did spin one wheel. The pressure treated electric pole was estimated to weigh around 3000 lb. There is a road on the right side, and where it started spinning is a slope with no flat area. I hooked onto his tractor, and in tandem we pulled the pole down to where you see the boys. These poles were being used to build a bridge for an Eagle Scout project.