BX25 Mid PTO Pump or BUST

[J_J]

Brand new, two stage HI/LO pressure hydraulic gear pump.

Surplus Center - 11 GPM 2 STAGE HYD PUMP

Brand new. BRAND Model LV22RFSTKAB.

http://www.surpluscenter.com/item.asp?item=9-7401&catname=hydraulic

 

[Artisan]

J_J you da MAN! ( As usual and par ) :thumbsup:

 

[magicheater]

I have dealt with the Surplus Center for nigh on 15 years. When I buy a "Brand New" item it is something they either stock on a regular basis or have made especially for them and brand it. The "other" stuff may be as you describe. I have purchased both in that time frame and have not been disappointed.
I have noticed that the prices on "Brand New" items are escalating, sign of the times I guess.

 

[Zebrafive]

Just so you know, I hope you WIN :thumbsup: Hit a home run!

 

[hddnis]

Size your pump to provide a flow of 12-14gpm as this will allow you to run standard attachments made for walk behind skid steers and track loaders such as the Toro Dingo or Bobcat MT55. It opens up a whole world of standard tools from post hole augers, to cement mixers, brooms, blowers, tillers, pumps, saws, stump grinders and the list goes on. Many of these are available used or from a rental yard by the day.

You could adjust your pressure relief to protect the motor from stalling. You also don't have to limit your system so that it can't stall the motor, that is only one way to configure a system to run attachments. Many systems on the market today, such as mower or tillers, do not protect the motor from stalling, that is up to the operator.



Mr. HE

 

[Artisan]

HA! OK Zebra5...thank you ...

hddnis my research says I do not have the HP to do that. I guess it is what it is.
I can get maybe 10GPM or so w/ the HP and RPMs I have. Not to fret, THAT
will do a lot. The tractor itself only puts out a lil over 6GPM. So if I can build a
stand alone system at 10 a guy can do a lot.

Ill focus on my shaft, my mounting and after that things kind of get dictated
by what exacty do you want to run, I think. I believe if I have a 10GPM
system and if I run lets say a 5.3GPM T-Post driver, I have 4.7 GPM pushing
past that relief right? So that will heat up the oil real fast right? Gawd I have a lot to learn...

 

[J_J]

HA! OK Zebra5...thank you ...

hddnis my research says I do not have the HP to do that. I guess it is what it is.
I can get maybe 10GPM or so w/ the HP and RPMs I have. Not to fret, THAT
will do a lot. The tractor itself only puts out a lil over 6GPM. So if I can build a
stand alone system at 10 a guy can do a lot.

Ill focus on my shaft, my mounting and after that things kind of get dictated
by what exacty do you want to run, I think. I believe if I have a 10GPM
system and if I run lets say a 5.3GPM T-Post driver, I have 4.7 GPM pushing
past that relief right? So that will heat up the oil real fast right? Gawd I have a lot to learn...

Not exactly, as the fluid not used is just going to tank.

You could also limit the GPM's by the tractor rpm.

My Power-Trac, uses a valve like this to supply the fluid to the hyd motor.

Surplus Center - 1/2 NPT HYD FLOW CONTROL VALVE W/RELIEF RDRS150-16

http://www.surpluscenter.com/adspecs/AS9-064-50.pdf

 

[hddnis]

HA! OK Zebra5...thank you ...

hddnis my research says I do not have the HP to do that. I guess it is what it is.
I can get maybe 10GPM or so w/ the HP and RPMs I have. Not to fret, THAT
will do a lot. The tractor itself only puts out a lil over 6GPM. So if I can build a
stand alone system at 10 a guy can do a lot.

Ill focus on my shaft, my mounting and after that things kind of get dictated
by what exacty do you want to run, I think. I believe if I have a 10GPM
system and if I run lets say a 5.3GPM T-Post driver, I have 4.7 GPM pushing
past that relief right? So that will heat up the oil real fast right? Gawd I have a lot to learn...

You do have the power to flow more than 10gpm.

At fixed HP, as pressure goes up flow goes down. Conversely as flow goes up pressure goes down. Only fixed number is your HP in this case.

Most hydraulic systems use between 2000-3000psi. Some use much less, some much more.

To explain my suggestion a little better. Go for a flow rate of 12-14 gpm at full throttle. You will want a pressure relief in the system of no more than 3000psi to protect hoses, pump, fittings, etc. (for your application)

Your available HP will not give you full flow (12-14gpm) at relief pressure (3000psi) What I'm saying is that you don't have to limit your flow based on HP. The HP is the limit of the work you can get from your tractor, not a limit of either flow or pressure.

The only reason to build within those limits is stall protection. You don't have to build in stall protection. If you want to have that feature you can adjust your relief pressure, you will still be getting the full working potential of your horsepower (minus system efficiency derating).

Anyway, just a friendly suggestion, with the goal of giving you more options. I'll be following your project with interest.



Mr. HE

 

[Iplayfarmer]

I like hddnis's suggestion. In other words, you size your pump to put out 12-14 gpm at full throttle and just get whatever pressure you get. Worst case scenario, you stall your engine and have to start it again. If you need something with less flow and higher pressure, you can tap into your tractor hydraulics that you already have onboard.

I think a key here is that you are designing a secondary hydraulics system to compliment what you already have. You should build it to do what you can't currently. The option to use a lot of the currently available skid steer type attachments is a good option to have. It's all about versatility. Few of these attachments are going to require the full pressure, but you can't really run them without the proper flow.

 

[ultrarunner]

The guy building the BX skidplates was also selling mid mount pumps... Bro Tek is in Canada and is/was very active here on TBN.