Yanmar YM3000 3 Point Hydraulic

[jutas593333]

Hey everyone,
I have a Yanmar YM3000 and I'm a bit confused about how the 3-point hitch hydraulics are supposed to work. Right now, there's a lever that I can push or pull, and the hitch either goes up or down — but it's really hard to get it to stay in one place. It feels like it's either lifting or lowering all the time, with no "hold" or position control.


Is this how it's supposed to work? Or is there something wrong with it? I was expecting it to have some kind of position control so I could set the height and it would stay there. Right now it seems more like just up/down with no real in-between.


Any advice or info on how this system is supposed to work would be much appreciated!


Thanks!

 

[winston1]

YANMAR YM240 HYDRAULIC SERVICE MANUAL YT7707-165E

www.tractorforum.com

Yours is similar to this. Watch your control plunger where the linkage hits it making sure it is making or not making contact at the correct times.

 

[jutas593333]

YANMAR YM240 HYDRAULIC SERVICE MANUAL YT7707-165E

www.tractorforum.com

Yours is similar to this. Watch your control plunger where the linkage hits it making sure it is making or not making contact at the correct times.

Thank you for your reply. This manual is helpful thank you.

However as I look into that manual I assume it does not have position control ? Only RAISING or LOWERING, and switching into neutral should MAKE it stay fixed at any point ?
Do I understand correctly ?
Because I always assumed that hydraulic lift position fully depends on the control lever position.

 

[winston1]

Thank you for your reply. This manual is helpful thank you.

However as I look into that manual I assume it does not have position control ? Only RAISING or LOWERING, and switching into neutral should MAKE it stay fixed at any point ?
Do I understand correctly ?
Because I always assumed that hydraulic lift position fully depends on the control lever position.

When you move your control lever to any position your lift should go to that position and stay there. You are right in your thinking. Raise your seat and watch your controls as you actuate the lever.. Also make sure the rod on the control valve is not sticking as it moves in and out. What is your history on this problem. Been that way since you got it or this has just come up?

 

[jutas593333]

When you move your control lever to any position your lift should go to that position and stay there. You are right in your thinking. Raise your seat and watch your controls as you actuate the lever.. Also make sure the rod on the control valve is not sticking as it moves in and out. What is your history on this problem. Been that way since you got it or this has just come up?

I did cleaning and reseambling of control valve body. It moves freely, without sticking.
It has been this way since I bought this tractor.
I was looking a lot under seat how it works, and I can not understand how it should stop at any control lever position is pointed. Because control valve only does Raising or Lowering and Neutral, I assume somehow Control Lever - Feedback Rod (of hydraulic lift) - Control Valve Rod, should be in sync, but I have no idea HOW Control Lever can affect hydraulic lift so it is FIXED at that position that is proportional to Control Lever position.

OffTopic: Right now it is super hard to work with it, even attaching sprayer with triangle is super hard, because it can't stop raising or lowering. I found work around just close that little valve with tiny rod lever and hydraulic lift never lowers, just can go up at any position, and this is how now I can spray field, because before that it just kept raising or lowering until sprayer hits ground on its own... When I found Neutral Position it is very tricky, if sprayer gets lighter or heavier (as I fill it up) it raises or lowers... (gets out of neutral position)... It feels way more like Draft Control than Position Control... Super weird for me.

I attached some photos, maybe it could help a little

 

[careyo63]

Look under the cover the of Hyd. Valve. What looks like is happening is your handle is in the highest position. And the spring looks to be applying pressure to the control valve trying to lift if still. The spring should not have pressure on the control pin. fully lifted. Push the handle forwards the lowest position. And there should not be any pressure on the pin. " spring might be to tight" still trying to lift it. Unhook the spring to the control valve and see what happens . The pin sticking up on the side is the lower and lift rate. Neutral is pointing Straight up. I believe for words increases the lowering rate and Neutral to back wards is the lift rate. Control valve HV-451 which should be the same one. No doubt you clearly have a leak. The soaked rag is a good sign of that.

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[jutas593333]

Look under the cover the of Hyd. Valve. What looks like is happening is your handle is in the highest position. And the spring looks to be applying pressure to the control valve trying to lift if still. The spring should not have pressure on the control pin. fully lifted. Push the handle forwards the lowest position. And there should not be any pressure on the pin. " spring might be to tight" still trying to lift it. Unhook the spring to the control valve and see what happens . The pin sticking up on the side is the lower and lift rate. Neutral is pointing Straight up. I believe for words increases the lowering rate and Neutral to back wards is the lift rate. Control valve HV-451 which should be the same one. No doubt you clearly have a leak. The soaked rag is a good sign of that.

Attachments

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  002 (3) (600 x 450).jpg

  200.8 KB · Views: 202

I will try what you suggested, just wanted to quickly specify that soaked rag is not because of leak - I did that to prevent metal pipe rusting. To clarify it, there is original metal hose-pipe that goes from the front and into control valvebody, but is disconnected because Front Loader is attached and Hydraulic Hose is used. So metal hydraulic pipe is not removed (because I see it would be hard to get it out) and there is no point in getting it out, it doesn't interfere with anything, so I just soaked it a little in oil and put some inside so it does not rust quickly. (It was like this when I bought it).

 

[careyo63]

Rusted pipe could be the the problem. Should be all Aluminum tubing. Debris getting into the control valve.? Cyl. and a piston is pretty much all there is to it and that would cause a problem. Bet the Hyd. filter is super dirty! May want to pull and clean it. JS..

 

[jutas593333]

Rusted pipe could be the the problem. Should be all Aluminum tubing. Debris getting into the control valve.? Cyl. and a piston is pretty much all there is to it and that would cause a problem. Bet the Hyd. filter is super dirty! May want to pull and clean it. JS..

That pipe is disconnected, because front loader is attached and rubber hose is used.
Hyd. filter will be cleaned for sure anyways.

 

[ponytug]

To me, disconnected means "removed". So, as the pipe is clearly there, open on one side and loosely plugged with a rag, what is on the other end of that pipe? The hydraulic reservoir?

All the best,

Peter