Need to source Hyd pump 18 GPM Capacity at 3000 PSI

[sweettractors]

A friend has asked if I would help him source a new hydraulic motor to power a tractor 3 point hitch round hay bale unroller. Needs to be direct drive and have good low rpm torque to start the roll turning. 18 GPM capacity at 3000 PSI maximum. Where is a good place to start looking? Thanks, Ken Sweet

 

[SPYDERLK]

Is the drive a 1:1 ratio? Surplus Center has motors of several displacements with a 540 pto stub. They also have large displacement motors that would run slow at 18gpm and have HUGE torque at 3kpsi.
larry

 

[sweettractors]

Is the drive a 1:1 ratio? Surplus Center has motors of several displacements with a 540 pto stub. They also have large displacement motors that would run slow at 18gpm and have HUGE torque at 3kpsi.
larry

Direct drive 1:1 would be optimal. Ken Sweet

 

[BukitCase]

https://www.surpluscenter.com/sort.asp?catname=hydraulic&byKeyword=yes&search=hydraulic motor pto

Probably the 9.59 cubic inch one, it's the slowest and has about 230 ft. lb. of torque. It'd still need a flow control, doubt if your friend wants a round bale to turn at 470 rpm :=) Steve

 

[J_J]

A friend has asked if I would help him source a new hydraulic motor to power a tractor 3 point hitch round hay bale unroller. Needs to be direct drive and have good low rpm torque to start the roll turning. 18 GPM capacity at 3000 PSI maximum. Where is a good place to start looking? Thanks, Ken Sweet

https://www.surpluscenter.com/item.asp?item=9-7368-80&catname=hydraulic

https://www.surpluscenter.com/item.asp?item=9-7368-125&catname=hydraulic

https://www.surpluscenter.com/sort.asp?catname=hydraulic&byKeyword=yes&search=pto drive motor

 

[sweettractors]

Thank you for the leads. You guys are very helpful. Ken Sweet

 

[sweettractors]

Here is what He needs to make the motor do. He wants to rotate a 3000 lb roll of hay at low rpm's,
direct drive 1:1. How much torque is required to start and turn the bale. Supplied pressure 3000 psi at 18 gpm. Can anyone help with the size motor he would need? Ken Sweet

 

[BukitCase]

You said "pump" - before it was a motor. I'd assumed your friend would use tractor remotes to power the bale unroller. If so, check out this

http://www.eaton.com/ecm/idcplg?Idc...eleased&Rendition=Primary&dDocName=DEV_216691

Look on page C-1-5, the upper chart is for their version of the 8.59 Cu.In/rev but without the agri-splined pto shaft. (third row down, third from the right is 3000 psi @ 1 gpm. Check the bottom of the chart for a guide to what the numbers are.

Near as I can tell, at 1gpm and 3000 psi, that motor would develop 3330 inch pounds, /12 would equal 277.5 foot pounds of torque at 3 rpm. (20 seconds per revolution) -

Realistically, the surplus hydraulics version seems to be rated a bit lower, but I'd expect it still to be around 200+ foot pounds of torque. Picture 100 pounds on the end of a 2 foot bar - unless there are frozen bearings involved, I'd think this would be enough.

With a 1:1 ratio, you would NOT want full flow thru the motor, just full pressure. So a flow control would be needed to slow down the bale (else centripetal force would unroll that bale REALLY quick :confused2:

So, are we still talking about a motor, or will friend be using a separate pump, or??!? Steve

 

[sweettractors]

You said "pump" - before it was a motor. I'd assumed your friend would use tractor remotes to power the bale unroller. If so, check out this

http://www.eaton.com/ecm/idcplg?Idc...eleased&Rendition=Primary&dDocName=DEV_216691

Look on page C-1-5, the upper chart is for their version of the 8.59 Cu.In/rev but without the agri-splined pto shaft. (third row down, third from the right is 3000 psi @ 1 gpm. Check the bottom of the chart for a guide to what the numbers are.

Near as I can tell, at 1gpm and 3000 psi, that motor would develop 3330 inch pounds, /12 would equal 277.5 foot pounds of torque at 3 rpm. (20 seconds per revolution) -

Realistically, the surplus hydraulics version seems to be rated a bit lower, but I'd expect it still to be around 200+ foot pounds of torque. Picture 100 pounds on the end of a 2 foot bar - unless there are frozen bearings involved, I'd think this would be enough.

With a 1:1 ratio, you would NOT want full flow thru the motor, just full pressure. So a flow control would be needed to slow down the bale (else centripetal force would unroll that bale REALLY quick :confused2:

So, are we still talking about a motor, or will friend be using a separate pump, or??!? Steve

. That info should get him out of the woods.

Steve, sorry about the typo, still talking about a motor. Appreciate the explanation and also the link. Thanks, Ken Sweet

 

[BukitCase]

Ken, no problem - at 67, I'm getting 'way too familiar with "brain farts" -

Just a re-think here - is the 1:1 ratio requirement an attempt at keeping things simple? 'cause I'd be a bit leary about having something that's rotating a 3000 lb. bale be capable of 500 rpm. Seems like either the bale or the tractor or both might go flying in a direction that could turn painful pretty quick.

If the "KISS" method is the reason, there might be a slower, larger displacement motor around - if it's turning something that isn't already set up for a 540 PTO, then the motor wouldn't have to be splined. It could just as easily be a keyed shaft, which might open up the option of a larger displacement (slower, more torque) motor.

Just a thought... Steve

Here's one example -

https://www.surpluscenter.com/item.asp?item=9-8030&catname=hydraulic

180 rpm, over 600 foot pounds torque, 1-1/8" keyed shaft, $220. (non-name brand) Pressure rating's a bit lower, might need a relief valve in the circuit.