Anybody have source for a 540 RPM hyd motor to run tractor attachments on PT?

[m5040]

Excellent idea. I will keep it in mind about the chain drive. Right now I only have a PT180 but looking real hard at the PT1430. I do wish I could find a low hour used one. I don't need that new tractor smell.

 

[agjones]

I think you'll find that the geometry of a tractor pto shaft really handcuffs a pt. That's why I went to the chain drive. Your hydraulic system is already protected by relief valves, so the shear pin etc is not necessary.

With the chain drive, I'm not limited to 15 degrees flex under power... I can power at any angle the loader arms can make.

 

[m5040]

At the full flow and pressure of your 1430, 12gpm@2500psi you have about 20hp that can be applied to a 5.1ci hydraulic motor to yield 540rpm.

Calculations are rounded and from here :
Hydraulic Calculations | Fluid Power | Advanced Fluid Systems

I've converted a few and really prefer to go with a chain sprocket mounted on the hydraulic motor that drives the implement gear box.

Keeps the weight down. It's easy to still power w a tractor (take off the chain) and generally allows the orientation of the tool for safe, effective use.

I will have to have a couple cups of coffee before I try that formula. But in your experience what would be the real life difference between the 4.95 motor (which wants 2576 psi and 17.1 gpm) and on the other extreme, the 9.59 motor (which wants 2780 psi and 19.7 gpm) when using the PT1430 PTO at 2500 psi at 12 gpm? Since the PT has insufficient psi and gpm would the larger motor still provide more torque or would the smaller motor due to it being provided with psi/flow closer to it's requirements? {using the surplus center's tractor splined motors at Ag PTO Output Hydraulic Motors | Hydraulic Motors | Hydraulics | www.surpluscenter.com } provided by LouNY.

 

[agjones]

The larger displacement might offer more torque, but it's not much use at less than 300 rpm.

 

[m5040]

OK, I think I got it, the larger motor will be for applications like a rotor tiller or drill head low rpm and high torque. Small motors for high rpm like mower or leaf blower.

 

[agjones]

If you want to power a tractor implement using the existing gearbox, you need a hydraulic motor that can convert your hydraulic flow into 540rpm or pretty close.

If you want to eliminate the 540rpm gearbox then you want a hydraulic motor capable of generating the tool rpms. In a recent chipper conversion, I used a high speed, low torque motor, similar to that on a pt finish mower deck To get 2300rpm to the chipper head. At 30#x2300rpm ,the chipper head mass is what powers through the chipped materials. The hydraulic flow is just maintaining the rpm. Same w other bladed implements.

In the tiller example, it's the torque developed in the motor that powers the next bite of soil, not the rotating mass of the tines.



So yeah, low speed high torque is a good fit for tillers, wheels etc. And small displacement hydraulic motors are a good fit when high rpms are required.

 

[MossRoad]

I like to think of the motor displacement as gearing. Tiny motors are high speed/low torque. Larger motors are medium speed/medium torque. Even larger motors are low speed/high torque.

 

[MossRoad]

Take a look at the different attachment pictures and compare the motors while thinking about speed...

 

[m5040]

Take a look at the different attachment pictures and compare the motors while thinking about speed...

View attachment 622095 View attachment 622096 View attachment 622097

That trencher motor looks pricey.