3pt Help!

[chriswh]

New member but long time lurker.

I have a 3810 thats been no trouble but after replacing 3 hoses on my loader today the 3pt is acting up. I'm no career mechanic but I know my way around a shop, this however has me stumped. My guess at this point is debris in the control valve but lets see what you all think.

With draft control disengaged I have about 3 inches of room on the lift control until it takes off all the way up, fully lifted. When it gets to the top, the engine bogs down and pump whines. When draft control is engaged you can pull the control lever nearly to the top before any response, again it goes all the way up and tries to continue pumping. If I push the lever down half an inch it will drop slowly and stop just as normal. While descending however the ram is always in the neutral position regardless of control lever position.

Link to YouTube video for a visual on the problem..... Yanmar 3810 3PT hydraulic issue - YouTube
Any help at all is greatly appreciated..the good news is I can still lift my flail and the 3pt floats in order to mow, I'd like it to work correctly though.

 

[winston1]

It sounds just like your feedback rod is out of adjustment. Did you mess with it in any way when changing the hoses? Another stupid question, could you possibly have got the power beyond hose and return hose from your loader swapped?

 

[chriswh]

It sounds just like your feedback rod is out of adjustment. Did you mess with it in any way when changing the hoses? Another stupid question, could you possibly have got the power beyond hose and return hose from your loader swapped?

The hoses I swapped were to rams on the loader. The PB and return were untouched.

Is the feed back rod associated with the draft control?

 

[winston1]

The feedback rod has a turnbuckle and goes from lift arm shaft to the control valve shaft. When set properly it keeps your lift from continuing to lift when the rockshaft is at its upper most position. I can't believe that is your problem though since this just happened when you changed hoses. Several guys on here have the 3810 so maybe they can chime in with drawings are manual information. :confused3:

When you use the term draft control I am believing you are talking about the lift control handle. Draft control actually has a handle of its own. That is if you have draft control. Are we confused yet? No matter, your video makes it plain what is happening, bottom line for me is I don't know.

 

[chriswh]

The feedback rod has a turnbuckle and goes from lift arm shaft to the control valve shaft. When set properly it keeps your lift from continuing to lift when the rockshaft is at its upper most position. I can't believe that is your problem though since this just happened when you changed hoses. Several guys on here have the 3810 so maybe they can chime in with drawings are manual information. :confused3:

When you use the term draft control I am believing you are talking about the lift control handle. Draft control actually has a handle of its own. That is if you have draft control. Are we confused yet? No matter, your video makes it plain what is happening, bottom line for me is I don't know.

The tractor does have draft control, it's a separate lever behind the seat. I also have the 336 manual but concerning this situation it's been no help.

Thanks for giving it a shot, I really appreciate it.

 

[Midniteoyl]

Were the old fittings on the old hoses flow control/restricter type?

Only thing you did was replace the loader hoses?

 

[chriswh]

Were the old fittings on the old hoses flow control/restricter type?

Only thing you did was replace the loader hoses?

No flow restrictors to my knowledge. Looked like standard 3/8 flare.

And yes just the loader hoses. Perplexing isn't it?

 

[runningbird]

is there a chance that one of the new hoses is rubbing on a feed back rod? or restricking movement?

 

[chriswh]

is there a chance that one of the new hoses is rubbing on a feed back rod? or restricking movement?

No hoses rubbing but after messing with it a bit yesterday and after everyones feedback, it is indeed the feedback rod and draft linkage causing the problem. I was able to get it full range back by pushing the feedback rod manually, then it made a pop like it set back in place. I think today I'll pull the lift arm off and reset everything and give it another shot.

While descending though it is still in a floating position, no downward force, what would cause this?

 

[Car Doc]

I see 2 things first the draft engaging lever is in auto draft position up (3pt control wont work) that's the one on the right rock shaft needs to be flipped down to use the draft lever. And the little lever for the lowering speed under the seat on top of the 3pt control block is set to far back that is if its anything like mine it needs to be either in the middle or a bit forward. hth

Fact there is another thread on a 336 3pt problem on here that we helped another guy and I posted some pics on mine maybe that will give you a better idea. I start of by telling the guy the wrong info I didnt have my tractor nearby but the next page I mention how it should be fwtw. hth

Oh and there wont be any downward force only lift force these are not power down hyd systems.

http://www.tractorbynet.com/forums/yanmar/279732-yanmar-336-three-point-hitch.html

 

[chriswh]

I see 2 things first the draft engaging lever is in auto draft position up (3pt control wont work) that's the one on the right rock shaft needs to be flipped down to use the draft lever. And the little lever for the lowering speed under the seat on top of the 3pt control block is set to far back that is if its anything like mine it needs to be either in the middle or a bit forward. hth

Fact there is another thread on a 336 3pt problem on here that we helped another guy and I posted some pics on mine maybe that will give you a better idea. I start of by telling the guy the wrong info I didnt have my tractor nearby but the next page I mention how it should be fwtw. hth

Oh and there wont be any downward force only lift force these are not power down hyd systems.

http://www.tractorbynet.com/forums/yanmar/279732-yanmar-336-three-point-hitch.html

I usually have the drft control down but in that position I only had about a 3" range of motion on the position lever before the 3pt would raise all the way to the top. Im pretty sure I've got it all worked out now. Thank you all for the help.

Chris

 

[Car Doc]

I usually have the drft control down but in that position I only had about a 3" range of motion on the position lever before the 3pt would raise all the way to the top. Im pretty sure I've got it all worked out now. Thank you all for the help.

Chris

Welcome! Do you mind sharing what you found? We all use this forum as a resource and as of late there seem to be quite a few 3pt threads looking for help you may well have info that could help the next guy might even be me never know! :thumbsup:

 

[chriswh]

Welcome! Do you mind sharing what you found? We all use this forum as a resource and as of late there seem to be quite a few 3pt threads looking for help you may well have info that could help the next guy might even be me never know! :thumbsup:

What I think happened is I the draft control (stupid option in my opinion) half way engaged itself the last time I used the hitch. This caused the feedback rod to get out of adjustment. How I fixed it was disengage draft control, set the position lever all the way down the manually manipulated the feedback rod in order to get the 3pt to the fully raised position, at this point I pulled the position control to the rear position where it should be for the fully raised position. All works fine now. Any questions just ask.

This was just one of those weird things that took a little thinking to figure out. You all got me on the right track with the feedback rod though. Thanks!

 

[Car Doc]

Ok that sounds like something that could happen to any of us glad you got it thanks for the update! :thumbsup:

I experimented with mine at first thinking that it would be a cool thing to have operational. I spent quite a bit of time messing with it I either had it too sensitive or not enough and I gave up. Its fairly involved making all the settings to spec.

Granted it could be useful if a person had long stretches of ground to work which I dont other than my driveway and I use a heavy drag on it. I am with you on it being an option that is probably not getting a lot of use here in the US just my guess?

 

[Midniteoyl]

Thought dragft cntrol was just for plowing? You turn it off for most implement use..

 

[Car Doc]

Thought dragft cntrol was just for plowing? You turn it off for most implement use..

In the rice paddys where these came from they use tillers mainly. But yes you are right it wouldn't get a lot of use except plowing or tilling or box bladeing.

 

[winston1]

A lot of the rice paddy tiller draft controls were hooked up like mickeyfx did his. That is a cable that goes from the tiller to the three point control. That is the way my 2002d draft control is suppose to work although I have never tried to do it and won't. Just from my reading your larger models draft control is different.

 

[Car Doc]

Yeah ours uses the tension actually put on the lift arms to adjust the depth, you set the depth first and then flip the lever btw . The lift arms essentially work backwards on the control when its engaged the harder the load pulls down the more it raises the arms.

There is a 3 position spring for lack of better terminology the top link is attached to that gives the "reading" to the draft control rod assy. For all other uses the top link is in the top (less movement) position.

 

[winston1]

Yeah ours uses the tension actually put on the lift arms to adjust the depth, you set the depth first and then flip the lever btw . The lift arms essentially work backwards on the control when its engaged the harder the load pulls down the more it raises the arms.

There is a 3 position spring for lack of better terminology the top link is attached to that gives the "reading" to the draft control rod assy. For all other uses the top link is in the top (less movement) position.

Now that is a good explanation of how it works. :thumbsup:

 

[Car Doc]

Thanks.