Hydraulic motor size

[Rio_Grande]

Anyone know what size hydraulic motor I need to drive a post hole auger through a gear box? I am wanting to convert a 3 point digger to a hydraulic. Figure if I add a gearbox to it and mount it from a plate it should work. Then I can use it on the front of my skid steer or tractor!

 

[jim_wilson]

I'd be curious to see if there is some sort of formula that can be used to size a hydraulic motor. I've got a snowblower I've thought about converting over to hydraulic drive.

 

[J_J]

PTO hyd motors with splines.

Surplus Center - 4.95 CU IN PTO DRIVE MOTOR

Surplus Center - 6.15 CU IN PTO DRIVE MOTOR

 

[Rio_Grande]

Any reason this wouldnt work JJ?
Surplus Center - 5.4 CU IN BUCHER BHB090A921200B HYD MOTOR

I will be connecting it to a straight shaft so there is not a need for the splined unit. Although that gives me a few ideas.

I intend to mount straight to the gearbox. then the rest of the unit will be mounted to the skid steer mount.

 

[J_J]

Just about any hyd motor in that range should work.

The rpm shown is for the GPM indicated, and if you can't provide the GPMs, it will run slower.

Will this motor be used with your track loader or something else.

I believe your loader puts out about 19.8 GPM at 2760 psi.

Here is a skidsteer adapter to power any of the 3pt implements you might have.

http://www.skidsteersolutions.com/ProductDetails.asp?ProductCode=EZ-3PT-80-S3

http://www.skidsteersolutions.com/Skid_Steer_LF_3_Point_Adaptors_s/53.htm

http://www.berlon.com/3pt.php

 

[Rio_Grande]

Yes it is primarily for the skid steer.

 

[oldnslo]

I'd be curious to see if there is some sort of formula that can be used to size a hydraulic motor. I've got a snowblower I've thought about converting over to hydraulic drive.

Here are some formulas.

Usually have to start by estimating torque or HP required and work back from that point.

 

[woodlandfarms]

Save your self the money and bypass your gear box and direct drive the drill shaft. it is what I did.

Surplus Center - 28.3 cu in HYD WHEEL MOTOR W/5 BOLT HUB

Did a bit of rigging and this thing is a monster. I can post pix if you need it.

 

[J_J]

Save your self the money and bypass your gear box and direct drive the drill shaft. it is what I did.

Surplus Center - 28.3 cu in HYD WHEEL MOTOR W/5 BOLT HUB

Did a bit of rigging and this thing is a monster. I can post pix if you need it.

Plenty of torque with that motor. 9700 in-lbs. cont. 160 rpm.

How about a picture of the post hole digger put together.

How big an auger have you used to date?

 

[Rio_Grande]

Would love to see some pix of the direct drive set up.

 

[jim_wilson]

Save your self the money and bypass your gear box and direct drive the drill shaft. it is what I did.

Surplus Center - 28.3 cu in HYD WHEEL MOTOR W/5 BOLT HUB

Did a bit of rigging and this thing is a monster. I can post pix if you need it.

OOOooh. I like.

That's got me thinking of actually building that self powered dumper that I've had in the back of my head for a while.

I'd like to see pics of what you've done with it. I always like seeing other people's work.

Thanks!

 

[J_J]

jim_wilson

It takes about 34 HP at 2500 psi to run that motor hub assembly.

 

[woodlandfarms]

Here ya go.

All in with hoses, connectors, it was $1000. I had all the steel cut and drilled, did my own welding. Got a good bit that set me back more than I expected. And the hoses and connectors were brutal. The bit is 12" but I am sure I could spin a 30 in my dirt no problem. Just don't have the 1200 for that bit.

It eats up roots, I don't really have rocks. About the only thing that has stopped it was when I drilled into my double walled culvert by mistake. That was a mess....

For reference, I am 18GPM at 3100 PSI and a 65HP engine backing it up

 

[jim_wilson]

jim_wilson

It takes about 34 HP at 2500 psi to run that motor hub assembly.

I'm going to have to bone up more on my hydraulics knowledge to get a better understanding of all of this. What kind of hydraulic pump would it take to drive four of those motor hub assemblies?

 

[J_J]

If you used 4 of those motor, then you would have to pump about 80 GPM, and at 3000 psi, HP required would be about 164.

Try some smaller wheel motors.

Surplus Center

 

[jim_wilson]

If you used 4 of those motor, then you would have to pump about 80 GPM, and at 3000 psi, HP required would be about 164.

Try some smaller wheel motors.

Surplus Center

I'm probably approaching this from the wrong angle.

Is there a formula for how much torque from a wheel motor it would take to move a certain amount of weight at a certain speed?

For instance if I had four driven wheels - and I wanted to move 10,000 pounds at 5mph - how would I figure the wheel motor requirements to do that?

 

[J_J]

That kind of engineering is a little bit above my level

For that much weight, I would compare the hyd motors on a large skidsteer, or something equivalent.

 

[Rio_Grande]

That is alot simpler way to get to where I want to go. Did you just build an adapter for the auger and bolt it onto the motor or is there more to that connection than I see?

I was shopping for flush face hydraulic adapters and noticed that the 1/2 inch only seems to flow 11gpm. That is about half what I can produce. Am I onto the wrong thing or is 11gpm all a half inch connector will flow?

Jim what kind of connectors do you have on your setup?

JJ any advice? it appears that that motor Jim posted has 1/2 in bsppm but indicates that it has a 20-24 gpm flow rating. That leads me to believe that a 1/2 inch port must have the capability to flow at least 20-24 gpm?

School me fellas!!

 

[J_J]

Surplus Center - Tech Help

Select hose sizing on the left.

http://www.parker.com/literature/St...iterature Static Files/SPD P-107 Pamphlet.pdf

Page 15.

 

[woodlandfarms]

Are you referring to my build Rio?

I kept the wheel motor hub, basically I plan to put a log splitter on it later...

I then had a round peice of steel cut, appropriate holes drilled, and a pole welded to it. Bolted it on. Now I can take any 2" round auger bits.

Carl