Is there any way to slow down 3PH?

[etpm]

I have a YM2310. I have posted about this before. My 3 point hitch rises very fast even when the engine is spinning slowly. It seems to jerk up because it moves so fast. This is especially problematic when drilling holes and the post hole digger is being stabilized by a helper using the supplied handle. It moves down nice and slow but then comes out of the hole scary fast, which always takes the helper by surprise. Any thoughts?
Thanks,
Eric

 

[JasperFrank]

Hydraulic flow control knob?

 

[Yander]

Yep, what he said.... Most tractors have a circular knob under the seat that you turn to slow it down or speed it up. My dealer told me never to close it off completely because apparently with Yanmar it can cause seals to blow. No reason I would ever do that anyways.

 

[5030]

Restrictor washer in either fitting.

 

[Tinhack]

Yep, what they said. And another, don't move the lever so fast.

 

[bmaverick]

Yep, what they said. And another, don't move the lever so fast.

Best answer.

I typically set the daisy flower valve under the seat to slow the 3PT lift for the PHD, otherwise, yes, moving the lever slower is the trick.

 

[etpm]

I have been told, and my manual says the same thing, that the knob under the seat is for locking the the 3PH in position. That is it's only function. There is a lever near it that is for controlling the lowering speed, but it doesn't have anything to do with raising the 3PH.. Moving the lever that controls the 3PH slower is not the answer. No matter how slowly the lever is moved the 3PH raises very fast. So even tiny increments of lever movement results in very fast rising of the 3PH. Even if it is a very small amount. This is why it seems to be jerking. I barely move the lever and the 3PH rises quite fast. I cannot raise the 3PH smoothly. I guess I will try closing the valve with the knob so I know it is bottomed out and then open it a little and then operate the 3PH to see what happens. I have been warned not to do this because it might dead head the hydraulic pump. Which may then break stuff. But I gotta try something. I am having a hard time believing that Yanmar did such a good job designing and building the rest of my tractor but neglected the 3PH.
Eric

 

[oldballs]

How's this for a guess...........Maybe cut back on the throttle (engine rpm) before you raise the attachment.

Cheers,
Mike

 

[bmaverick]

I have been told, and my manual says the same thing, that the knob under the seat is for locking the the 3PH in position. That is it's only function. There is a lever near it that is for controlling the lowering speed, but it doesn't have anything to do with raising the 3PH.. Moving the lever that controls the 3PH slower is not the answer. No matter how slowly the lever is moved the 3PH raises very fast. So even tiny increments of lever movement results in very fast rising of the 3PH. Even if it is a very small amount. This is why it seems to be jerking. I barely move the lever and the 3PH rises quite fast. I cannot raise the 3PH smoothly. I guess I will try closing the valve with the knob so I know it is bottomed out and then open it a little and then operate the 3PH to see what happens. I have been warned not to do this because it might dead head the hydraulic pump. Which may then break stuff. But I gotta try something. I am having a hard time believing that Yanmar did such a good job designing and building the rest of my tractor but neglected the 3PH.
Eric

Depending on the Yanmar model and the hydraulic system under the seat, you may find a tiny lever to adjust in small 10 degree increments to slow the drop and lift speed. This is what one looks like on a YM2500, YM2610, YM3000, YM3110, YM4300 and possibly others.

Flip the seat forwards and look for this tiny lever to make adjustments.

 

[winston1]

looking at videos of the 2310 I see is has a 6 star handle adjustment which on some models would be a lock out valve only. On other models it also serves as a drop control. However, I see the 2310 also has another shaft coming out in the same area with a straight pin coming out of it. Do you know what that controls? (drop speed?) That handle can be seen in the first few seconds of this video.

 

[etpm]

Depending on the Yanmar model and the hydraulic system under the seat, you may find a tiny lever to adjust in small 10 degree increments to slow the drop and lift speed. This is what one looks like on a YM2500, YM2610, YM3000, YM3110, YM4300 and possibly others.

Flip the seat forwards and look for this tiny lever to make adjustments.

View attachment 781367

Please see my reply to winston1.
Eric

 

[etpm]

looking at videos of the 2310 I see is has a 6 star handle adjustment which on some models would be a lock out valve only. On other models it also serves as a drop control. However, I see the 2310 also has another shaft coming out in the same area with a straight pin coming out of it. Do you know what that controls? (drop speed?) That handle can be seen in the first few seconds of this video.

My tractor has the knob and the shaft with the pin coming out. Turning this shaft only controls the drop speed. The manual also says that's what it does and says the knob is only for locking the 3PH in position. There are no other shafts to turn under the seat. I am going to post a link to a video tomorrow showing how fast the 3PH rises even with the throttle set low. My son is going to help me video the operation. I am not sure how to post the video but am thinking YouTube will be the best option.
Eric
Eric

 

[npalen]

I've not heard of a 3PH with speed control on the upstroke, only the down stroke. I don't think there would be any place to install a restrictor for the up stroke as most tractors have internal plumbing for the 3PH.

 

[California]

Maybe relevant? My first YM186D 3-point rose fast, too fast for grading a surface smooth. That tractor may have had some non-pro mechanical work on the hydraulics and/or other aspects.

My present YM186D, the one with loader and power steering, allows gentle use of the lift lever for a more precise amount of lift. Probably as Yanmar intended.

 

[kwbretired]

Does your tractor have draft control on it? If so make sure it is in the down position completely. If all the way up, it will make the 3 point very sensitive to upward adjustments.

 

[etpm]

Does your tractor have draft control on it? If so make sure it is in the down position completely. If all the way up, it will make the 3 point very sensitive to upward adjustments.

My tractor does indeed have draft control. Though I have never used it I can describe it. There is a lever coming out of the main casting. Near the base of the lever is a hole through which the end of a rod passes. This rod, which is about 8 inches long, is threaded for much of its length. The rod has a spring around it for the complete length. This spring bears against a little rectangular block that is threaded at one end to accept the rod. The block is turned to a 10mm diameter at the other end and there is a 1.5mm hole cross drilled through the 10mm diameter. This hole is for a hairpin retainer. On one arm of the 3PH is a plate that rotates with the arm as the arm raises and lowers. This plate has hole for the 10mm diameter. So as the arm moves the rod is pushed and pulled which then moves the lever coming out of the main casting. At the end of this lever is a fitting for a cable end. About 6 inches below the end of this lever is a plate with a hole. This plate accepts a cable sheath. The other end of the sheath connects to a plow or some other implement. When the plow moves up and down it pulls or releases the cable running through the cable sheath. I disconnected the rod with the spring around it and then tried raising the 3PH. Though the position of the lever does make a difference of when the arms move as the control lever is moved it has no effect on the speed. So I put everything back together. Tomorrow I am going to try changing the position of the block on the rod to see if it makes any difference in the rising speed. I am not optimistic. This morning my son made a video of the 3PH rising just so other folks can see how fast and jerky it is. The video was made with the engine running at 1200 RPM. I just need to figure out how to post the video to YouTube because it has been at least 10 years since I posted a YouTube video.
Eric

 

[etpm]

OK, I just uploaded a video to YouTube of my really fast rising 3PH. The orange cylinder hanging from the rod is a counterweight to keep the auger pointed down at the desired angle. Link:

The engine us at 1200 RPM. BTW, also on my channel is a video I posted about following error in CNC machines. I made the little setup to show someone how it worked.
Eric

 

[ponytug]

@etpm thanks for the video. It seems like there is a lot of bounce (backlash) in your system, at least compared to ones that I am used to. Has it always been that way?

Your other video brought back memories! That used to be something I was tasked with reducing/driving below measurement levels. One of my favorites was finding a worm screw (drive screw) that had a significant (to us) difference between the axis of the screw, and the axis of the cylinder, causing half the angular steps to be too large and half to be too small.

All the best,

Peter

 

[bmaverick]

OK, I just uploaded a video to YouTube of my really fast rising 3PH. The orange cylinder hanging from the rod is a counterweight to keep the auger pointed down at the desired angle. Link:

The engine us at 1200 RPM. BTW, also on my channel is a video I posted about following error in CNC machines. I made the little setup to show someone how it worked.
Eric

I can only see the jerking as the up lifting from the control lever is just touched in small increments.

I would assume some sort of flow control device seal has gone bad.

My machine will do this same jerking fast up lift when the tiny lever is in the wrong place under the seat. Or the lift just doesn't function at all. It's sure puzzling how your machine doesn't have that tiny adjustment lever.

Now your trick to keep the 3PT auger level is niffty. I'll have to do mine as well. Thanks!

 

[etpm]

@etpm thanks for the video. It seems like there is a lot of bounce (backlash) in your system, at least compared to ones that I am used to. Has it always been that way?

Your other video brought back memories! That used to be something I was tasked with reducing/driving below measurement levels. One of my favorites was finding a worm screw (drive screw) that had a significant (to us) difference between the axis of the screw, and the axis of the cylinder, causing half the angular steps to be too large and half to be too small.

All the best,

Peter

No backlash, it just rises super fast. It is very hard to adjust when using the back blade. It has always been like this.
Eric