Hydraulic Flow question

[blucoondawg]

I have the DK50SE, which according to Kioti's website produces 16.8 gpm of hydraulic flow. I wonder is this 16.8 the actual amount through the rear remote? I am wondering because I have seen a skidsteer implement which I may be interested in which requires 15.5 gpm, it is a firewood processor, I am wondering if the tractor could run it, I have a hard time believing it could.

 

[Boss 302]

That is a good question, I would be interested in knowing the answer to this also. Gotta love those Blue Ticks, I hunt Walkers.

Randall

 

[J_J]

That total 16.8 GPM flow might include any power steering you may have. So, Implement flow could be less.

No matter what it is, you can use anything hyd, might be a little slower.

 

[LD1]

My guess would be you have about 12 GPM for implement flow.

IT is deceiving but when you see the specs list "total" flow, they are including the powersteering, which is usually around 5GPM on a tractor that size.

And like JJ said, you can run it fine with lower flow, it will just be slower.

 

[the old grind]

Question for you hydraulically experienced guys:

Suppose 16GPM including 5 for the PS from a 'shared' pump. Driving with implement the PS can use "up to"(?) 5GPM and 11GPM 'min' is then available for other functions. So, could more than 11GPM be available to implements when standing?

It's easy to expect that there are frictional losses, and that implement 'requirements' may be based on tractor ratings rather than measured flow. Lord knows we often operate attachments on the fringes of those 'ratings', as LD1 says. (I don't see the OP spinning donuts in the yard while processing firewood. )

No one's response should be considered absolute or definitive, but some discussion could help those of us who wonder about stuff like this. Surely excess capacity is a good thing, but isn't there a bit more wiggle room than just the numbers imply?

 

[LD1]

I could be wrong but I think most tractors have a separate pump for PS. IE, 2 pumps, PS making 5gpm and implement making 12gpm and they list it as "total" 17gpm.

And even so, if there is only 1 pump, The power steering is likely an open center design. Therefore, it dont matter if you are using steering or not, 5gpm is running through the steering box and back to tank.

 

[buickanddeere]

Flow is also measured with the engine at max red line rpm.

 

[murphy1244]

I could be wrong but I think most tractors have a separate pump for PS. IE, 2 pumps, PS making 5gpm and implement making 12gpm and they list it as "total" 17gpm.

And even so, if there is only 1 pump, The power steering is likely an open center design. Therefore, it dont matter if you are using steering or not, 5gpm is running through the steering box and back to tank.

Your correct on that 2 pumps

 

[murphy1244]

Flow is also measured with the engine at max red line rpm.

Flow is at PTO speed.

 

[Coyote machine]

PTO speed IS red line speed.

 

[murphy1244]

I think we AGREE on that.

 

[LD1]

"rated PTO speed" is usually a few hundred RPM's less than redline. And "rated PTO speed" is where most of the specs are taken at. Travel Speed, Hydraulic flow, loader cycle times, etc.

 

[Sysop]

"rated PTO speed" is usually a few hundred RPM's less than redline. And "rated PTO speed" is where most of the specs are taken at. Travel Speed, Hydraulic flow, loader cycle times, etc.

Agreed, my engine RPMs are 2400 to get the PTO to the rated 540 but my engine doesn't redline until 3400RPM. This is similar to others I've operated.

 

[murphy1244]

Dk-40 is 2600

 

[J_J]

PTO has nothing to do with hyd flow except when you use a PTO hyd pump.

Hyd flow is dependent on the engine rpm and I believe the max flow is at max engine rpm.

You can still run a wood processor, it has a large splitter cyl and several smaller cyl and some hyd motors to move wood around.

Now, if you install a PTO hyd pump you may obtain more GPM's, and the pump size is based on your engine HP.

Your tractor does have Power steering, and I believe the one pump might have two sections.

 

[Coyote machine]

Dk-40 is 2600

Stated another way: It is the PTO actual red line on the tach at 2600RPMs for Cat 1 rated implements.

 

[murphy1244]

Stated another way: It is the PTO actual red line on the tach at 2600RPMs for Cat 1 rated implements.

PTO is 2500 rated max is 2600.

 

[mj007]

PTO has nothing to do with hyd flow except when you use a PTO hyd pump.

Hyd flow is dependent on the engine rpm and I believe the max flow is at max engine rpm.
.........................

That's what they're talking about - Hydraulic flow of tractor's pump AT the engine RPM required to turn the PTO @540 RPM ........ Roger?

 

[J_J]

blucoondawg asked what was the flow at max engine rpm to implements, and max engine to produce the max flow is at max engine rpm.

PTO rpm is at a lower engine rpm and therefore less GPM's to the implements.

This has been beat to death, let it go.

Not his engine. Just figures, but associated.

Max engine might produce about 12 GPM's.

Engine at PTO rpm might produce about 10 GPM's.

 

[LD1]

That's what they're talking about - Hydraulic flow of tractor's pump AT the engine RPM required to turn the PTO @540 RPM ........ Roger?

Thats what I am talking about.

I guess the MFG's arent clear. It could be either I guess. And it could even be different by MFG I suppose. I was just always under the impression that flow specs, speed specs, cycle times, etc was all measured at the engine RPM that delivers 540 PRO rpm, which is a little less than WOT.