Hydraulic pump - Capacity??

California · Sep 1, 2011

My YM240 (YM2000) has the optional adjustable-width front axle. I thought I read somewhere that this 7cc/rev hydraulic pump was also a step-up, to sell as a 'loader-ready' tractor. Anybody know?

This works fine for farm use if you aren't in a hurry. But I would want faster hydraulics if I used the tractor primarily as a loader.

Also: Is the hydraulic pump turned 1:1 with crankshaft speed? What is 7cc/rev, in gallons per minute?

I wonder how this system is designed - revving the engine doesn't seem to make the loader faster above moderate speed, maybe 1400 rpm.

mrmikey · Sep 2, 2011

Don't know if the pump is driven 1:1, if it is, 7cc per rev at 1800rpm would be 12600 cc or 3.33 US gpm or 2.77 IMP gpm. (140kg sq.cm is 2000 psi btw in case you weren't sure)
If the ratio is different, multiple accordingly, i.e. if it'd driven 2:1 it would be double etc.......Mike

HoyeTractor · Sep 2, 2011

The 7cc is the standard pump. The upgrade was a 9cc pump.

California · Sep 2, 2011

mrmikey said:
if the pump is driven 1:1, ... 7cc per rev at 1800rpm would be 12600 cc or 3.33 US gpm

Thanks! That is the math I was looking for.

Presuming it runs 1:1 and they rate it at pto speed then 2200/1800 x 3.3 = 4.54 gpm, which I think is the spec for the standard pump.

And thanks Aaron. Do you sell the larger pump?

HoyeTractor · Sep 2, 2011

And thanks Aaron. Do you sell the larger pump?

Yes. You can find it here-

Yanmar Tractor Parts: HYDRAULIC PUMP

.

kenmac · Sep 2, 2011

California said:
My YM240 (YM2000)I wonder how this system is designed - revving the engine doesn't seem to make the loader faster above moderate speed, maybe 1400 rpm.

My loader will move a little faster with the engine revving . But, I'm usually above the 1400 mark. Going from 2000-2250. It would be great to have it move a little faster

J_J · Sep 24, 2011

GPM is a function of engine speed, the more rpm's, the more GPM will flow. If it is not producing more flow at higher speed, then I would suspect a worn pump which is bypassing.

Using a larger pump will provide more GPM's. It will also take more HP to run it.

Lee River · Jul 2, 2014

I have a Yanmar 186D ,should the hydraulic PSI should be around 1900 psi ? the factory releaf valve is set at 2062 psi .
thx
Don

284 International · Jul 3, 2014

Just because it might be useful to people searching for similar things in the future, there is a wonderful project put together by Scotty Dive with fairly comprehensive data on the majority of Yanmar machines, including some with hydraulic pump info. You can find it here: https://docs.google.com/file/d/0B85YoHWb2pqbWkVqOUdQZXZja2c/edit

There is also a little more info not yet put into his spreadsheet at post 4 here: http://www.tractorbynet.com/forums/yanmar/220495-original-brochures.html#post2522417

Anyone who has unlisted tractor models could look at their hydraulic pump late and share their rated engine speed, and we can update the chart with that information too.

winston1 · Jul 3, 2014

When not in use the fluid just circulates and is not pressured. When in use the pressure would run at whatever is required by the on hand task. Could be any range up to 2062psi.

J_J · Jul 3, 2014

The load will determine the pressure developed.

Total pressure will be regulated by the relief valve which is designed to protect the pump.

The adjustable relief valve is set close to the pumps max pressure potential.

Install a hyd gage and check the pressure by maxing out the cyl. Full extend or retract.

If you can't get the stated pressure then you have some worn parts, be it the pump or cyl piston seals leaking, or relief valve.

normde2001 · Jul 3, 2014

winston1 said:
When not in use the fluid just circulates and is not pressured. When in use the pressure would run at whatever is required by the on hand task. Could be any range up to 2062psi.

What is "not in use"? When running, the pump should pump at rated psi.

J_J · Jul 3, 2014

No, not true.

Yes, the pump is pumping, but not under pressure in an open center hyd system.

In a Closed center hyd system, and all valves are in parallel.

You might have some standby pressure ready for use at each valves IN port.

The pump only pumps at rated psi when you have max load.

chriswheeler · Jul 3, 2014

I bought one of the higher cap pumps from Hoye couple of years ago. The pump made a night and day difference how the loader moved on my YM3000, price was right as well. I would recommend this pump to anyone with a loader on a Yanmar. If you are just running arms on a 3 point think the standard pump would be fine, larger pump sure makes a difference with a loader.
Chris

winston1 · Jul 3, 2014

normde2001 said:
What is "not in use"? When running, the pump should pump at rated psi.

J_J explained it better than I could.

normde2001 · Jul 3, 2014

winston1 said:
J_J explained it better than I could.

Are you saying the warnings of high pressure spray from a broken output line causing injury are untrue?

winston1 · Jul 4, 2014

No, all I am saying is the hydraulic system on these old Yanmars do not have high pressure on them until the system is being used. The fluid is just in constant circulation. Lot's of scenarios here. For instance, if a tractor (Yanmar) is not running but has a loader bucket full and raised then yes there is pressure on the line from the loader cylinder to the control valve but not on the discharge line of the pump.

Usage determines line pressure.

normde2001 · Jul 4, 2014

winston1 said:
No, all I am saying is the hydraulic system on these old Yanmars do not have high pressure on them until the system is being used. The fluid is just in constant circulation. Lot's of scenarios here. For instance, if a tractor (Yanmar) is not running but has a loader bucket full and raised then yes there is pressure on the line from the loader cylinder to the control valve but not on the discharge line of the pump.

Usage determines line pressure.

So if I loosen an output line on my yanmar, with no hydraulics in use and start the tractor, the fluid wll not squirt out under pressure, but will only trickle out.

winston1 · Jul 4, 2014

Probably come out less than 20lbs. In fact, not today, but sometime in the near future I am going to put a gage on mine to better and more accurately answer that question. I will do it with a load and without a load, that is if I can fine a place to put a gage and I likely will.

Back again. I did find a place to tee in and necessary fittings plus my glycerin filled gage. Might do this tomorrow.

Nice to be at the stage in life you can just do whatever you want to when you want too. Big plus is still being able too.

Scotty Dive · Jul 4, 2014

Here is video I made recently of my gauge going through a full bucket curl and back. If you look closely you can see that without a load the system pressure is about 50-100 psi and then spikes up to 2200 psi when the cylinders are fully retracted and extended.

http://youtu.be/6l-svq7kiFQ