Plumbing a loader on a Yanmar 276D

[Barry 1]

That's just how they are.All you can do is idle it down,but it doesn't help much.

 

[old grayfellow]

My tractor is the YM 186D . And the block is mounted on the side and the 1/4 " plug you are referring to is located in the PBY port on the block . And the PBY hose is connected to the PBY port on the control valve . And this PBY port has the PBY fitting installed that the hose connects too .Based on what you are explaining it would suggest I am not getting the full fluid circulation . This explains why I was able to confirm there is definitely to much pressure at the 3 point hitch .Could not see your photo .
thx
Don

I believe the supply hose coming from your divider block should be running to the input port on your loader valve, rather than to its power beyond port. I just recently plumbed up a loader on my 186D and the speed of the three point hitch was not affected, it works fine.

 

[old grayfellow]

Yes. The US Yanmars come with a divider block just before the hydraulic line goes into the 3-point assembly. The default is fluid comes in one side of the block and out the other side, straight through as if there were no block. If a loader is added, an internal plug in that block is moved to send fluid out one port to the loader then the fluid comes back in the other port and onward to the 3-point. (With this series arrangement, the loader's control has to be plumbed to pass the full volume of fluid at all times except when lifting/curling the loader).

I put a photo in this recent thread showing the block on YM240. My YM186D is similar except the block is bolted to the side of the transmission so the porting isn't as obvious as YM240 but it works the same. I expect YM276D has this later style.

I don't see how plumbing a loader this way could affect the 3-point lift speed.

Yes I agree with California on every point. Stock plumbing on the 186D puts the entire hydraulic pump output through the three point hitch (via the divider block when there's no plug added) so I don't think there's any way that changing the plumbing could make the fluid flow any faster to the 3pt than the stock arrangement.

The headless plug is just added to interrupt normal flow straight to the three point, and route it instead through the hose to your loader.

By the way, I expect you already know this, but don't forget to reconnect the supply and return hoses to each other (or remove the headless plug again) if you ever disconnect your loader. Otherwise otherwise the pump will be deadheaded.

 

[California]

I believe the supply hose coming from your divider block should be running to the input port on your loader valve, rather than to its power beyond port.

Bingo! I think this is the issue. Per the YM240 manual output from the diverter block goes to loader control input, loader control output goes to the other port on the divider block and onward from there to the 3-point.

PBY (Power BeYond) isn't used at all, or is used as an output to some other attachment per Yanmar's setup diagram. And that 'other' attachment has its own return direct to the sump.

PBY is always an output from the loader control, not an inlet, no?

Most important of all: heed old grayfellow's advice. There must always be a fluid path available from the pump, through something, and back to the sump. Capping or using a disconnected quick-connect, so the fluid has nowhere to go, will destroy the hydraulic pump instantly.

 

[winston1]

"PBY is always an output from the loader control, not an inlet, no?" Your are correct.

 

[Lee River]

Yes. The US Yanmars come with a divider block just before the hydraulic line goes into the 3-point assembly. The default is fluid comes in one side of the block and out the other side, straight through as if there were no block. If a loader is added, an internal plug in that block is moved to send fluid out one port to the loader then the fluid comes back in the other port and onward to the 3-point. (With this series arrangement, the loader's control has to be plumbed to pass the full volume of fluid at all times except when lifting/curling the loader).

I put a photo in this recent thread showing the block on YM240. My YM186D is similar except the block is bolted to the side of the transmission so the porting isn't as obvious as YM240 but it works the same. I expect YM276D has this later style.

I don't see how plumbing a loader this way could affect the 3-point lift speed.

When you mention the 1/4" plug in the divider block is moved , do you mean removed ?

 

[Lee River]

Yes the supply hose is running to the inlet port from the block . And the PBY hose is connected to the other port on the divider block .

 

[Lee River]

Do you have the Yanmar set up diagram you are referring to ?

 

[California]

I asked the same questions when I replaced the dribbly 30 year old loader control on the YM240.

See this thread. I asked all the beginner questions and got some good advice, after much discussion:

http://www.tractorbynet.com/forums/yanmar/269934-power-beyond-vs-series-loader.html

This thread may lead to answers quicker than that one:

http://www.tractorbynet.com/forums/yanmar/221299-loader-plumbing.html
Maybe helpful

http://www.tractorbynet.com/forums/yanmar/220599-hydraulic-system-diagrams.html#post2522872

http://www.tractorbynet.com/forums/hydraulics/229020-how-much-loader-drop-acceptable.html

http://www.tractorbynet.com/forums/yanmar/269934-power-beyond-vs-series-loader.html

Found another thread discussing this:
http://www.tractorbynet.com/forums/yanmar/368840-hydraulic-yanmar-flow-power-beyond.html

 

[Lee River]

Re: my ym186d plumbing and 3pt hitch rising to quickly . A big thx you to all those who replied putting all those ideas together was extremely helpful .
- back pressure to the sump is 150 psi . I am assuming being under 500 psi is good .
-tractor hydraulic system has never worked better .
- the pressure at the 3 pt hitch above normal which increases to the lift speed but i feel I can live with this condition .
Just now wondering if the tee handled control under the seat that locks the 3 pt hitch in any position if almost closed will slow the speed of the 3 pt hitch ?