Line sizes for 25 gpm

[Wayne County Hose]

The oil is 10/30 motor and the temps never gets above 50 f according to the temp read out in the loader. (that things got a good oil cooler, rarely see 120 even in the summer)

The pressure rarely sees 1000 psi when splitting.

I can see by the charts my flow is excessive for 1/2" hose

I'm just wondering how much the pressure will drop for the $200+ bill this will create. Wonder if I should consider a bypass loop on the cooler?

Too good of an oil cooler, like jb said. You could run a temp bypass on it, only goes through the cooler when the oil reaches a certain temp.

This is a little tough for me to explain but I'll try my best. When you have too small of a hose, you do lose pressure but it is directly related to flow. The higher the flow, the more pressure you lose. Lets say you're splitting wood, bringing the wedge forward to the wood. Not much pressure, but a lot of flow. Let's say that for this, your pressure drop across the entire circuit is 500 psi. When your wedge hits the wood, flow slows and pressure builds. Pressure drop comes down because flow came down. Now, if you run the splitter cylinder to the end of it's travel and there is no flow, pressures equalize. So you will always have the same max psi in your system no matter what size hoses. It's just that between 0 and max psi, you will lose some because of the restrictions in the circuit. Make sense?

Andy

 

[skidsteer.ca]

Andy
I (believe) I fully understand what your saying about how flow affects pressure.
Just seems to me 200 psi drop would be alot better for just circulating oil, but maybe thats impossible unless I lighten the oil.
Even with no cooler I have to warm the components of the system, which can be a challenge at -10f
Was not aware of "thermostats" for hyd system but thats what I should have.
Can you email me a link, info, ?
Can you source 3/4 flat couplers?
Wonder if I have room for it? SSL's are tight.
Thanks
Ken at skidsteer.ca

 

[Wayne County Hose]

3/4" FF couplers are here, Bailey Hydraulic Cylinders Manufacturer. p70.

Let me research the oil coolers. Little busy here today.

Andy

 

[Farmerford]

Ken:

The 20W/30 fluid is as big a culprit as the 1/2" hose. Guessing at the viscosity as 150cP, the pressure loss for 20' of hose and 6 90deg adapters is 600psi, and half of that comes from pushing the thick oil through the 90deg fittings.

The ISO22 fluid that others use would reduce the loss to under 200psi. You are clearly right that the skid steer has a very capable oil cooler. I would probably block the cooler enough to get oil temps to 140-150 like Andy and JB said and live with it.

 

[skidsteer.ca]

Andy
If you get time, its pretty snug in there too. The fan blows through the cooler then the rad so I put a piece of cardboard between them with a 9" center hole. I'll have to watch the water temp when plowing snow.

Also ordered the 3/4 inch couplers and will post when its updated to bigger hoses.
Thanks guys, for the advise and info, I'll see what happens and let you know.
Don't think its going to make a big noticable difference, but hopefully I can get it down to 300...
Ken

 

[skidsteer.ca]

Well it took me long enough but.....
I got some 3/4 inch couplers for this only to find the ones on the loader are 5/8" So I tracked the 5/8" down, switched the hoses to 3/4" and replaced 2 90 degree fittings at the splitter valve with 45 degree. Also using the large couplers eliminated 4 more 90 degree fittings on the loader and when it was all said and done the pressure dropped to 450 psi at wot, 24 gpm. So it helped but not as much I hoped. I freed up about 2 hp.
I have a couple of flow selector valves kicking around the shop, So I though I would set them up to bypass the cooler for next winter.
Ken