3pt Help!

chriswh · May 29, 2013

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 · May 30, 2013

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 · May 30, 2013

winston1 said:
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 · May 30, 2013

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 · May 30, 2013

winston1 said:
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 · May 30, 2013

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

Only thing you did was replace the loader hoses?

chriswh · May 30, 2013

Midniteoyl said:
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 · Jun 1, 2013

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

chriswh · Jun 1, 2013

runningbird said:
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 · Jun 1, 2013

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