Have this 1964 M R S --Mississippi Road Supply---Tractor. It has the Detroit 4-71 engine. Question----It has power steering--the steering wheel operates the front tires and a foot pedal and or lever operates a hydraulic cylinder to turn the rear wheels. It will turn very sharp with this set up BUT I would like to have the steering wheel operate all four tires. Any ideas on how to do this??
- Thread starter lenray
- Start date
fastfarmall
Well-known Member
So you got a A-80, i got a neighbor that had a bought one new, that was the first 4 wheel drive in the area in 1962 or 63, a powerful tractor in it's day! But cant help you with it, it been 45 years since i seen one!
Been years since I worked on any of those things and as problematic as the steering was on them when new I sure would not want to go messing with the thing now. I do know the rear steering is a separate set up and not certain you want to try and tie them together. I know one of the old case tractors did what you want but it had a mode selector that allowed normal, or where bot steered the same way called crab and the the other where the rears went in revers of the front. I suppose if I were contemplating making the change I would look for a junk case and try to use that system or valve.
fastfarmall
Well-known Member
Hi i am pretty sure was a A-80, it even had a PTO shaft.He had a TD 15 IHC crawler, traded for the MRS, he hooked 2-5/16 plow's together and handled them good, had about a 9 or 10 foot blade and would go to town and push out the alley for his dad in the winter, I thought it was kool, i was in high school at the time!
Steve@Advance
Well-known Member
I suspect it could be done, but it would take some careful calculations.
I'm thinking flow dividers would be needed to keep everything operating in sync, and even that could gradually "creep" and get out of sync. Hydraulics, like any other power source, will seek the path of least resistance.
Cylinder displacement will need to be considered too. If the front cylinders are different size than the rear, they won't operate at the same speed. If single ended cylinders, they will displace more extended than retracted, another variable to consider.
Hydraulics are expensive and exacting. Best spend a lot of time at the drawing table before jumping into this!
I'm thinking flow dividers would be needed to keep everything operating in sync, and even that could gradually "creep" and get out of sync. Hydraulics, like any other power source, will seek the path of least resistance.
Cylinder displacement will need to be considered too. If the front cylinders are different size than the rear, they won't operate at the same speed. If single ended cylinders, they will displace more extended than retracted, another variable to consider.
Hydraulics are expensive and exacting. Best spend a lot of time at the drawing table before jumping into this!
caterpillar guy
Well-known Member
Like JM said there are several things to look into. And All valid points. One thing you might be able to do is use the switching/valving from a Skytrac for the control to the rear wheels this would allow you to switch from front only to both not just sure what all would be needed.
I am going to look into something like that for a 4166 and dispense with the link between the front and back wheels for the front and rear steering on that. Or just switch it to 4 wheel steer only.
I am going to look into something like that for a 4166 and dispense with the link between the front and back wheels for the front and rear steering on that. Or just switch it to 4 wheel steer only.
Thanks fellas for the good info. I think it is way beyond my pay grade to try and make a change. I just use the ole beast to pull other stuff out of stuck situations. If I had it in a field for a day--I probably would have a feel on how to make the turns. As it is maybe only using a few times per year--none last year..It is always an adventure to get the front and back working together--plus b eing 75 probably isn't a good fit.....saw that 4166 sitting out back--nice looking tractor.............
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