Something You realized can do with your tractor...

[clemsonfor]

folks you cant lock ur 3pt hitch from going up any farther, there is no direct connection to do that. there is a ploating piston in a cyl. to go up it hits the rockshaft to move your arms up, to go down gravity from arms/implement pushes fluid out th valve when lowered. locked unlocked you can still lift arms up if u can lift them and or the implement. dont matter if u got a ford,jd, yanmar, there all that way, unless some of these super new machines are different than tractors have been for 60yrs?

 

[winston1]

Good point clemsonfor, #16 in this 2000 parts drawing is not attached to the piston as you stated. Therefore nothing to hold the lift down. Yanmar Tractor Parts: HYDRAULIC_LIFT

 

[deepNdirt]

somthings holding my lift down, or either the back edge of the scrape is digging into the ground enough to allow the tires to be lifted, I do note by curling the bucket under it back backward on the tractor forcing the bucket edge to dig into the ground, Though I try this without locking the hydraulic and it only pushes the tractor, the tractor also has a floating adjustment lever that is not hooked to anything under the left side of the seat, I've flipped it back and forth at times to see if makes any different, It does seem to have effect on the lift maintaining itself in a position, not sure if this is in conjunction with why it is able to this this,

 

[npalen]

Many years ago, I mounted a coulter blade in lieu of one of the front wheels on my Case 446 (16 HP) very compact utility tractor. My idea was to slit sod for landscaping border. This was not a heavy tractor by any stretch but it sunk the 16" diameter (or thereabouts) blade down to the 5-bolt hub. Will admit that it wasn't the easiest thing in the world to steer but very effective otherwise.

 

[clemsonfor]

DND, so u say without it locked you cant lift the rear in the same way? i would put money on the top of the hydros on the 1700 is the same as the 2000? but if the piston is connected how can one replace the o ring on it? i wonder, maybe you have to diconnect the rock shaft and pull it like a engine piston? seems strange that they have them connected, i know old john deeres are set up just like mine, pretty sure massey and ford are the same as well?

 

[npalen]

Some of the sub-compact tractors use a two way cylinder on the 3PT which allows down pressure on the implements. This is very handy in some situations such as getting a rear blade to cut instead of float. There is a limit though as too much downpressure simply raises the rear tires. I'm surprised that there is not an aftermarket kit of some sort to accomplish 3PT down pressure on larger tractors. Especially with all the rear remotes, TopNtilt etc. "out there" it seems that having down pressure available would be good tool on the tractor. I believe that some 3PT post augers have optional down pressure kits but not sure how that is accomplished.
With that said, I hope this topic eventually will get back on track.

 

[clemsonfor]

The problem with an addon down pressure kit is that the lift is only designed to go one way on tractors designed that way. The back of a yanmar cyl or the other side of the lift piston that normally does not have fluid is open to the hydraulic fluid. What this means is that any fluid on the rear of the piston will just run out the back of the cylinder back into the sump, there is no head to hold pressure and the way its designed there cant be, the rock shaft runs through the middle of the bore on all tractors designed this way, you would have to have a hydro cylinder design with a shaft and wipers and a head on the back to keep pressure on the rear side of it. The only other way to get down pressure is to hook an external hydo cyl onto a roll bar or something up height to create the pressure needed to push down.

Sorry for more of a hijack I just want to try and explain the system better for folks that may not realize how they work.

 

[npalen]

I believe you're correct on external cylinders being required for a double acting 3PT.
Double-Acting Hitch Control EHR - YouTube
This video lists some of the advantages of a double acting 3PT, which I didn't know existed.

 

[Bob77064]

I believe you're correct on external cylinders being required for a double acting 3PT.
Double-Acting Hitch Control EHR - YouTube
This video lists some of the advantages of a double acting 3PT, which I didn't know existed.

Thanks for posting.

 

[California]

I've seen down pressure described as a feature on large tractors and I think on some specialty tractors such as the articulated ones from Italy - but not on the little CUT's we own. As noted it would just lift the rear tires.