Need help on rotary broom hydraulic conversion

[MossRoad]

Your formula works out to that but the calculator at SC says 14HP and to double that for a gas engine.

Surplus Center

Well aint that a kick in the $%^$# grrrr...

Anyhow, with a 20hp kohler I think it will be weak running both a broom and an alternator pulling that much HP off of a 2000 rpm PTO, and you still need power for forward and reverse. Why? Because that high speed PTO will have low torque and that's what you need in this application. A lawn mower deck needs high speed and lower torque, VS a tiller or broom that needs low speed and high torque.

Perhaps more info on the tractor would be helpful at this point. Model, specs, etc....

 

[J_J]

Just tell us the HP you have available and the rpm of the sweeper.

Hp to drive hydraulic pump = Psi x GPM / 1714

 

[oldnslo]

Locknut,
For ference: Here is a link to a company that build brooms for loaders. There specs all show 18 CIR motors for direct drive on brooms up to 7 feet.

Skid Steer Sweeper | Loader Sweeper › M-B Companies, Inc.

 

[J_J]

Seems like those 6 to 7 ft sweepers only run about 175 to about 250 rpm.

Flow requirement is about 20 GPM.

Motors are rated to 2500 to 3000 psi.

 

[Leejohn]

If you are interested? Here is the motor I have SC part #981-1003.

 

[locknut]

Well aint that a kick in the $%^$# grrrr...

Anyhow, with a 20hp kohler I think it will be weak running both a broom and an alternator pulling that much HP off of a 2000 rpm PTO, and you still need power for forward and reverse. Why? Because that high speed PTO will have low torque and that's what you need in this application. A lawn mower deck needs high speed and lower torque, VS a tiller or broom that needs low speed and high torque.

Perhaps more info on the tractor would be helpful at this point. Model, specs, etc....

Agco 2020,same as Simplicity Legacy 20HP Kohler..Similar size and setup as a JD 420 with an electric clutch right off the crank to a lower larger pulley and pto shaft designed to run around 2000rpm for mower deck or front snow blower.

 

[locknut]

Just tell us the HP you have available and the rpm of the sweeper.

Hp to drive hydraulic pump = Psi x GPM / 1714

20 HP Sweeper core runs at 135rpm which is driven by a 48T sprocket on a chain loop driven by a 12T sprocket on the hex bar shaft which the speed is 540 rpm and where I want the motor to be mounted.I really need to find out how much torque is needed on that hex bar shaft.I wish I had a large cordless drill that would output 5-600 in lbs @ 4-500 rpm.I'd strap it down and see what the broom could sweep with that input.

Did you check the specs and graphs on that vane pump?

 

[MossRoad]

So the front PTO is a pulley?

 

[locknut]

If you are interested? Here is the motor I have SC part #981-1003.

Thanks for checking that out.I think it's a little too large,but I'll keep it in mind.Thanks.

 

[locknut]

So the front PTO is a pulley?

No,the pulley is driven by two belts to the electric clutch pulley above it,pulley is mounted on a double-ended splined driveshaft that runs straight thru the center of the front axle.The rear spline is for a shaft driven deck and the front is for a 47" two-stage blower,60" rotary broom,or a factory hyd pump for a loader or other attachments.Can't find any specs for that pump,not that it matters for this project.