Help specing a hydraulic motor.

[jeff77indy]

dfkrug; How were you able to obtain your tractors pump flow rate at idle, is is stated somewhere or is there a way of calculating it?

My mixer has a 10:1 reduction using a chain and sprocket drive off the PTO shaft input.
I plan on connecting the hydraulic motor to the mixer input shaft which is drilled for a shear pin with a collar that is keyed for the hydraulic motor output shaft and drilled for the mixer input shaft.

Thanks
Jeff

 

[dfkrug]

How were you able to obtain your tractors pump flow rate at idle, is is stated somewhere or is there a way of calculating it?

Jeff, your implement pump is rated at the 540 PTO engine speed, so if that is
say 2200RPM, you get half that flow rate at 1100 RPM. The relationship is
linear, so you can calculate the flow rate at any RPM, if you use the
spec for your pump.

In my case (Kioto CK30), you can only get the spec (8.3GPM) from
the service manual.

I assume you are using the Mahindra for this effort. Note that even at
idle engine speed, these PTO mixers run a bit too fast, in my experience.
You can correct that if you choose a hyd motor displacement that slows
things down a bit.

 

[jeff77indy]

Thank you Sir, I was thinking along that line but was unsure about the gpm being linear across
the engine rpm spectrum.

So I'm looking at roughly 3 GPM at the 800 RPM idle speed of my 4110.

Again thanks.

Jeff

 

[dfkrug]

Thank you Sir, I was thinking along that line but was unsure about the gpm being linear across
the engine rpm spectrum.

Happy to assist.

Since I mix thick mud, a slow-turning drum is very important. My mixer
works very well. One upgrade I was considering is to remove the paddles
and add blades like the big mixers have. This would allow me to eject
the mud better when you reverse the rotation.