splicing in hydraulics

Cord · Nov 28, 2005

When you add a loader to the Yanmar tractors, most people have been cutting the supply and return lines between the pump and the transmission. This is fine for a gear shift model, but I have a power shift transmission and I'm a little leary of doing this. I'm concerned about reducing the pressure to the clutches causing them to slip resulting in damage. In theory this could be a problem as the clutches will need full pressure to push the loader into the pile at the same time the loader needs full pressure to scoop. The solution would be a dedicated loader pump, but this isn't a easy install. How many members out there use their power shift tractor and loader? I'm not talking about mowing grass with a loader attached, I'm talking about really working the tractor and loader.

I know that Yanmar installed loaders on their American tractors, but again they were all gear shift models. Does anybody know how Yanmar plumbs the loaders on their powershift tractors? Pics? Documentation?

mark777 · Nov 28, 2005

Cord,

I have plumbed power shift models for a FEL install. There was no noticeable difference from before and after. Using an open center controller simply extends the pressure in the loop and the return line is not required. One splice only and it worked flawlessly.

Mark

Tractors4u · Nov 28, 2005

</font><font color="blue" class="small">( I know that Yanmar installed loaders on their American tractors, but again they were all gear shift models. )</font>

Not correct, Yanmar sold Powershift models new in the US.

I had a loader plumbed via splicing the hydraulic supply line on an FX26D and a YM2610D, both were powershift models and I experienced zero problems and believe me, I worked those tractors.

Mickey_Fx · Nov 29, 2005

I'll second Brent and Mark for having my loader plumbed this way and no problems noted. With that said I don't know what the pressure is down stream of the loader control valve when the valve is directing fluid flow to the loader. Also don't know what pressure and flow is needed to keep clutch/bands on the powershift from sliping. I wouldn't think it anywhere near the peak pressure of about 2k psi or flow rate the hyd pump can provide.

Cord · Nov 29, 2005

I think you hit upon my concern. Nobody really knows. That's what was bothering me. I was hoping to have more members post here saying they have a power shift tractor and nary a problem.

How about this question...anybody know what the hydraulic output and pressure of the little 1110d's pump is?

pruntyc · Nov 29, 2005

I believe that is what Brent was saying, nary a problem. He may not have them now, but did and worked them hard, and didn't have a problem. Does it matter that he had and don't have now?

Gjamtrac · Nov 29, 2005

I have 4 different models of Yanmar and they all are Power Shift, YM146,YM187,YM226 and YM336. All these models have two pumps; one internal pump for the Power Shift and one on the side of the engine for loader/ three point hitch. So you don't need to worry about starving the clutches. What model tractor do you have? Somebody must have a parts or service manual that tells how many pumps your tractor has.

Cord · Nov 29, 2005

I have a 1110d. So the power shift clutches are driven by a internal pump? I had assumed they were driven off the engine pump. Is anybody able to confirm if the powershift tractors have a second internal pump? If there is truly a second pump on my tractor, then my concern has no foundation-that would be awsome.

lens12 · Nov 29, 2005

I have all US & most Japanese parts books. All powershift models have an internal powershift pump that is driven directly by the clutch shaft. The US models with Yanmar loaders were plumbed with the loader inseries with the 3 point. This is just the same as cutting the line & installing the valve in series. You aren't going to starve the powershift transmission. It uses a very small amount of oil to engage the clutches.