Hydraulic Motors?

[kubotakid USA]

pics of hydrostatic 4x4 grader Eric

 

[kdlklm]

Do you have any specs on that pump. What kind of speed does it get.

 

[kubotakid USA]

Do you have any specs on that pump. What kind of speed does it get.

No, It wouldent do you any good anyway, this machine weighs maybe 8000 lbs, and has a 4cyl diesel engine, You can you tube puckett bros grader 510 and see one in action, The point is, Its a 4x4, hyd motor on each wheel, And >1< hydrostatic drive pump. I also have another 4x4 machine setup the same way, Jacobsen LF 3810, 4x4 was an option, I dont understand why you want to complicate your machine with 2 pumps. Max speed on either one of these machines is about 10 mph, And you need about double that so specs off even the Jacobsen mower wont help much, The really cool thing about the jacobsen i that its a 2wd until you flip a switch and direct oil to the back axle, at that point it slows down, maybe 25%, so basically its like a transfer case in a 4x4 truck, only this is either 4x4 low or 2wd high. perfect for your application, you can get top speed in 2wd, or 4x4 at a slower speed.:thumbsup: Eric

 

[karlbike]

this is good stuff.
I'm looking at building a tractor similar to the Power trac T8 or T12.
I have a friend with a T8, but haven't jacked it up and looked too closely.

I want to Base it on this sort of power unit: Power Cube - Open Source Ecology

basically I'm building the power cube first, and setting up to build the machine (and others) to run off that power cube.

I'm looking to spec a pump that will run anything I can think of that would take less than 25 HP gas engine to run.

J_J, which power trac do you have and can I ask you more questions about it?

thanks
karl

 

[J_J]

I have the PT-1445, one of the older early 90's units with 45 HP gas engine.

That engine has to turn 3 hyd pumps for all the hyd functions.

That engine is capable of turning a 24 GPM pump or a combination of pumps, at a psi of 2750.

MY PTO pump is 13 GPM, and the steering and loader pump is about 1.5 GPM, so that leaves me about 9.5 GPM for the drive. Each wheel has a hyd motor.

I am usually not maxing the pump out all the time.

 

[kubotakid USA]

Do you have any specs on that pump. What kind of speed does it get.

KDLKIM, Iam gonna try to help you once again, with your wheel chair atv.. Remember, I have 3 good friends in wheel chairs, bad luck, It sucks, But they are my buddies, SO,..I want this to work as much as you do, You need to stay focused and decide what your gona do,. You posted that you had a hyd company hired, and its all good, a done deal,..then u post, what would you guys do?... That $htt aint gona work,..J,J has burned many candles, and so have I, and many others. Lotsa people wana help you and see this thing roll, SO Lets get back to work, and figure this thing out,.:thumbsup: .Eric

 

[J_J]

karlbike,

The most GPM from a pump driven with a 25 HP engine is 12 GPM, at 3000 psi.

The PT 425 uses a 25 HP engine for power.

 

[kdlklm]

KDLKIM, Iam gonna try to help you once again, with your wheel chair atv.. Remember, I have 3 good friends in wheel chairs, bad luck, It sucks, But they are my buddies, SO,..I want this to work as much as you do, You need to stay focused and decide what your gona do,. You posted that you had a hyd company hired, and its all good, a done deal,..then u post, what would you guys do?... That aint gona work,..J,J has burned many candles, and so have I, and many others. Lotsa people wana help you and see this thing roll, SO Lets get back to work, and figure this thing out,.:thumbsup: .Eric

I have got more than one company give me recommendations on what I should be using for pumps and motors and electronics, and they are coming back quite different from each other. So I'm only asking what other people think.

Things are very much on track, it's a slow process. things are moving along fairly well so far.

 

[kubotakid USA]

Therein lies the problem, too many cooks stiring, go with a guy like jj or kevin j, use the jacobsen 3810 schematic, 2wd for hi speed flip a switch and get 4x4 @ lower speed,.... smile- click- build,.. The deal has been done already, I would not follow the jak 3810 to the letter, as its pretty complicated, just use the basic drive parmeters, UUE dont need high speed 4 wheel drive,.. this is smart engineering, And your not going to the moon. these guys are plenty capable to help design your drive system.:thumbsup: Eric

 

[kdlklm]

the next thing on the agenda, is a parking brake. I was just looking for some thoughts on what might be some different options. I don't think I will need them on all four wheels. Probably just the rear ones will be fine.