Is it possible for a tractor to have limited slip?

[LBrown59]

To K7LN, Your are correct about limited slip differentials coming on the scene before 1965, *I did a little research:

n the 1950s and 1960s many manufacturers began to apply brand names to their LSD units. While Packard pioneered the LSD under the brand name "Twin Traction" in 1956, the most famous of these in the USA was Chevrolet's "Positraction". Since then, Positraction (often shortened to "positrac" or merely "posi") has become a genericized trademark for LSDs in the USA.

Also found a reference to Porsche having one in the 1930's, and Torsen making one in 1958. So I stand corrected, on LSD's.. but the first Posi-Trac by Chevrolet I have ever seen, was in the 1965 model year. I cannot find out exactly when it appeared for sure, but that is the first one I know of.

James K0UA

Back in 1958 a neighbor in the neighborhood I grew up in bought a new 1958 Rambler Ambassador.

It came with a limited slip differential
*I didn't have to do any research research_it came with the memory of the experence.

 

[k0ua]

Back in 1958 a neighbor in the neighborhood I grew up in bought a new 1958 Rambler Ambassador.

It came with a limited slip differential
*I didn't have to do any research research_it came with the memory of the experence.

I learn new stuff every day:thumbsup:

Famous quote from Men in Black "15 minutes ago you KNEW we were alone in the universe, what will you KNOW tommorow?"

James K0UA

 

[Surgeon]

Edit: I did not see this was already posted.



http://www.youtube.com/watch?v=yyVOl_Anlow

 

[charleyfarmall]

Here's the video on YouTube.

dcyrilc, if your tires were actually getting traction then they would not all of been spinning at the same time unless you had the differential locked. I know I have a foot pedal to manually lock the rear differential but the front is open. I don't know of any tractors with a locking front differential.

Some of the Landini's have locking front diffs. My McCormick GX50/ Landini Mistral America does.

 

[dcyrilc]

Some of the Landini's have locking front diffs. My McCormick GX50/ Landini Mistral America does.

Mine's a 30 year old Deere. I don't think it's going to have the perks of some of the new fancy tractors. Probably just due to limited traction as others have said.

I just thought about something. My axle lock doesn't work and one of the Deere mechanics I spoke with suggested that one of the ears which activate the lock mechinism could be broken. I wonder if the axle lock could be engaged and not releasing? I know the 4x4 cyliniod is bad and my 4x4 doesn't disengage. Maybe both are stuck on? I remember doing some hard pushing last summer and I was digging two holes from the rears spinning. Never thought anything about it until now.

Doesn't seem to bind any when turning though. Hmmm..... Something at least to think about.

 

[EE_Bota]

Mine's a 30 year old Deere. I don't think it's going to have the perks of some of the new fancy tractors. Probably just due to limited traction as others have said.

I just thought about something. My axle lock doesn't work and one of the Deere mechanics I spoke with suggested that one of the ears which activate the lock mechinism could be broken. I wonder if the axle lock could be engaged and not releasing? I know the 4x4 cyliniod is bad and my 4x4 doesn't disengage. Maybe both are stuck on? I remember doing some hard pushing last summer and I was digging two holes from the rears spinning. Never thought anything about it until now.

Doesn't seem to bind any when turning though. Hmmm..... Something at least to think about.

I would think with the duals, steering would be very difficult with the rear diffy locked. If you ever get it on gravel, you ought to feel some binding if you turn the front wheels to steer. My tiny tractor with turf tires will bind some in 4wd. I would imagine with duals, on gravel, if you take a hard turn, you ought to be able to tell...

rear locked...wants to go straight. 4wd locked too, wants to go straight and binds, and possibly hops a bit, as something breaks traction to allow the turn.

When I bought the tractor used, I used the binding hopping test to prove that the 4wd worked before I bought the tractor, otherwise it would have been difficult for me to even test.

 

[Heywood Jannockitov]

My JD 5425 has a chinese built Dana-Wuxi "Rimited Srip" front axle. :thumbsup:

 

[dcyrilc]

I would think with the duals, steering would be very difficult with the rear diffy locked. If you ever get it on gravel, you ought to feel some binding if you turn the front wheels to steer. My tiny tractor with turf tires will bind some in 4wd. I would imagine with duals, on gravel, if you take a hard turn, you ought to be able to tell...

rear locked...wants to go straight. 4wd locked too, wants to go straight and binds, and possibly hops a bit, as something breaks traction to allow the turn.

When I bought the tractor used, I used the binding hopping test to prove that the 4wd worked before I bought the tractor, otherwise it would have been difficult for me to even test.

We're going to be having high winds and/or rain for the next week, but when the weather breaks I'll see about taking some video of the tractor pushing against something immovable and we'll see what we get.

 

[jenkinsph]

dcyrilc,
Here in New Mexico we are headed for nice sunny weather for several days:thumbsup: No need for duals here unless you want them for stability on slopes.:laughing:

 

[EE_Bota]

We're going to be having high winds and/or rain for the next week, but when the weather breaks I'll see about taking some video of the tractor pushing against something immovable and we'll see what we get.

That sounds exciting! I look forward that that for sure.
Maybe you can use something hard to move, like a tree, instead of immovable, like my BX.

 

[milkman]

My JD 5425 has a chinese built Dana-Wuxi "Rimited Srip" front axle. :thumbsup:

Cracked me up.:laughing::laughing:

 

[dcyrilc]

dcyrilc,
Here in New Mexico we are headed for nice sunny weather for several days:thumbsup: No need for duals here unless you want them for stability on slopes.:laughing:

Please, just Cyril.

I like the idea of duels for side stability. I look at my tractor in my avitar and can't help thinking that it should be able to handle one heck of a side slope. Haven't tried it yet. Figure I'll wait until this summer.

I read some of the threads where someone has reversed their rears to gain a few inches and giggle to myself.:ashamed:

 

[dcyrilc]

That sounds exciting! I look forward that that for sure.
Maybe you can use something hard to move, like a tree, instead of immovable, like my BX.

I was actually trying to push over a tree last summer when it was digging the holes. I was figuring on trying the same tree again.:laughing:

 

[ovrszd]

I love threads like this. If all the opinions about how differentials work were true there would be a dozen varieties of differentials in existance. But in my world a differential is a differential and all are made alike. Planetaries are planetaries and all are made alike. Sun gears are Sun gears and all are made alike. And on and on and on.... :laughing:

P.S. The spinning tire doubles the speedometer reading. The speedometer is measuring driveshaft speed. When one tire is sitting still the driveshaft speed is doubled to the other tire by the spider gears.

 

[rjkobbeman]

(1) They're not all alike. Try Tru-Trac, No-Spin, Detroit Locker, eLocker and Air-Locker for a few examples.

(2) With the various ABS and anti-lock systems, this is no longer all the case.

(3) This needs a lot of explaining! :confused2:

No, they are not all alike, but in general the concept is the same. For all intents and purposes, they are kind of the same. Implementations of the limited-slip/locker do vary greatly sometimes. But the idea of a differential are the same.

How limited slip is implemented -- via a differential limited-slip/locker/etc. or ABS controlling each wheel via brakes -- certainly can come in many forms, varying drastically.

If both wheels are turing at the same rate and the RPM of those wheels are x, then one of the wheels is stopped... the other wheel's RPM will increase (assuming the drive shaft is turning at the same rate). I believe it is 2x.

 

[Jstpssng]

That sounds exciting! I look forward that that for sure.
Maybe you can use something hard to move, like a tree, instead of immovable, like my BX.

Sounds like a truck I once had... no matter how much I worked on it I couldn't get it to move.

Sorry, I just couldn't resist.

 

[EE_Bota]

Sounds like a truck I once had... no matter how much I worked on it I couldn't get it to move.

Sorry, I just couldn't resist.

It was bait, and you bit.
If I had Cyrils tractor, I could use it to store my BX on a shelf somewhere, for easier floor sweeping. The BX fights hardest when backed into a corner, and if the corner is two large oak trees, it is virtually immovable, yet collapseable for convenience.

 

[dcyrilc]

It was bait, and you bit.
If I had Cyrils tractor, I could use it to store my BX on a shelf somewhere, for easier floor sweeping. The BX fights hardest when backed into a corner, and if the corner is two large oak trees, it is virtually immovable, yet collapseable for convenience.

LMAO.:laughing::laughing:

 

[Jstpssng]

It was bait, and you bit.
If I had Cyrils tractor, I could use it to store my BX on a shelf somewhere, for easier floor sweeping. The BX fights hardest when backed into a corner, and if the corner is two large oak trees, it is virtually immovable, yet collapseable for convenience.

I know what you mean.
At 2800 lbs, my L275 is a lightweight. If I had bigger tractor, I'd just get into bigger trouble.

 

[dcyrilc]

I know what you mean.
At 2800 lbs, my L275 is a lightweight. If I had bigger tractor, I'd just get into bigger trouble.

My 2240 with the unloaded duels is just about 8,000# even. Imagine if the rears and duels were loaded.:confused2: