ID this hydraulic pump

[mjeselskis]

I got this hydraulic pump in a package deal and it's been sitting around the garage. It came off from a garbage truck. I believe it was mounted on the front bumper, maybe a direct drive from the crankshaft. I have no idea what it is for pressure or flow, but I'm trying to figure out if it could be used for a homemade firewood processor. Anybody know roughly what it may be for pressure/flow?

[SPIKER]

There should be an ID plate on it somewhere.   Pumps are pretty hard to ID otherwise as they are all build very similar.

Mark

[JDeere]

I would take it to a hydraulic shop to see it they could ID it. There is one in Portland where I have found them to be very experienced with pumps, etc.
www.brooklinemachine.com 

[Morewood]

Looks like a "Commercial  Shearing " pump . ID # or tag stamped on edge of flange ? If no information and you "must know " output flow . You can measure the width of the casting that the hoses are bolted to and the diameter of the gears in that section . You must disassemble to measure gear (dia X width) or guess it .
Then use charts in hydraulic books such as "Womack Fluid Power data handbook" to figure displacement measured in "  cu in per/ rev " then X rpm of engine or motor to get gpm .
Pressure is a result of the restriction to flow . the higher the operating pressure the more horsepower required.
That looks like a older commercial brand , due to the old reusable fittings on the hoses . Back then a pump like that may have been rated around 2000 or 2400 psi. max and was best to run at a working pressure around 1600 or 1800 psi. 
And this is IMO based on one photo. Google is your friend ! Frank

[Al_Smith]

Commercial Shearing is one high priced pump .They were used by companys such as Pitman on line trucks .Seals bearings etc are high priced for repair parts .Typical of most German made products the design is for all OEM parts .

I once rebuilt a line truck pump which was either a double or a triple at around 36 GPM .It took over 3 weeks just to get the seals .The boss was not happy .

[thecfarm]

Don't know nothing about Commercial Shearing hyd pump. But is that the type of pump that will last 2-3 times longer than a common pump?

[Al_Smith]

I imagine the OP could use it for a proccessor but keep in mind that thing drove off the front of probabley a big diesel engine .It will require some power to drive it at full output .

[Weekend_Sawyer]

I made a log splitter back in the 90's from one of those pumps.
I can't remember the specifics' now but I ran it off of a riding lawnmower engine.
I couldn't direct drive it so I put a double pulley on the engine and pump and had to put  a large pulley on one end. Sorry I am not exactly sure but I think the large pulley went on the pump side and it was 10". The cycle time was not great but it would split anything and cut right through knots.

Anyway basically I'm saying, yup it'll work with a little work.
Jon

[mjeselskis]

I managed to read the numbers off the tag. It is a Commercial pump, model # M37X429BART25-11.

I'm still striking out finding specs on it, even with the model number.

I see most people use multi-stage, or multi-section pumps for processors. Is there an advantage for that over using a pump like this?

[Al_Smith]

The advantage of using doubles or triples is basically you have in essence several sources of power .Independant from one to another .

Like for example a line truck .You might have boom controls on one section of the pump and the digger head (Auger ) on another and the winch on a third .

Now this is not saying you couldn't use a single pump with flow control divider valves .There's lots of ways to skin the same cat so to speak .

[mjeselskis]

Does anyone have a book or any resources to find specs on the pump?

I think this is a gear pump. What wears out on them when they go? Just seals?

[Al_Smith]

The better built models have a wear plate on the sides of the gears .I wouldn't get too concerned  about it because they last for a long time .

For that matter for what it would cost to rebuild that pump you could likely buy a brand new one from some place like Surplus center hydraulics .

[Morewood]

The best spliter pumps are hi-low style . You can use low hp engines 10 -20 hp and get high pressure.
The hi-low lets you have high volume at a low pressure for fast cycle times then when you hit some resistance it drops down to low volume at high pressure to do the work at a slower speed.

[North River Energy]

 
The following schematic is for a Commercial brand, two section stack pump on a Case excavator.  Layout is similar to other gear pumps I have had apart.   

The front section now drives the saw motor on the processor.  The cracked second section was removed and the pump reassembled with shorter tie bolts.  If memory serves, the new O-rings and related seals were fairly inexpensive.

Hitch up your suspenders and take a run at it.  Keep everything as clean as possible, and take photos of the order of things.  Take a measure of the gear length and diameter, give those measurements to any qualified hydraulics shop, and they should be able to tell you volume/rev.  If you have a means of measuring the bores, they should also be able to provide min/max wear dimensions for the housing.




 

[DDDfarmer]

Took a short hydraulic course with Rexroth/bosch,  too much info to soak in.  Most pumps have a tolerance around 10 micron if I remember right.  smallest dust the human eye can see is 40 micron.  Was told if you can spin a pump easy its worn out.  Now some of the pumps here on the farm can spin with a small breeze  ;D

I have been in a operating room and our local hydraulic shop, what they both have in common is the assembly table is spotless.  If you rebuild a pump keep it spotless.

Looks like a good pump to start with

[mjeselskis]

Got an email back from Commercial Shear. Specs they gave said 35 GPM at 1200 RPM and 2000 psi max.

I emailed back to find out if 1200 is the max RPM that it can run at, but either way, 35 GPM should do what I need. Now I just need to figure out how big of an engine I need

[Al_Smith]

http://www.surpluscenter.com/Tech-Help/Hydraulics/Calculators/Pump-Disp-HP/

[DDDfarmer]

ya...ahhhh no  don't think that will work for you..

Better send that to me before you get any bad ideas.... ;D

Nice score on the pump should make some things move with that