Hydraulic motor question

[veggie]

For all you guys who have experience with hydraulic systems...

I was give a brand new hydraulic motor. (Spur gear type).
Connections are 3/4" in and out.
I am wondering if there is any reason why I cannot use this unit as a light duty WVO transfer pump
if I couple it to a suitable electric motor. ?
Although it's rated to 3200 psi, I suspect I will require no more than 100 psi in the intended service.
(I would also incorporate a 100psi relief valve in the discharge line).
Comments ?

thanks,
Veggie

[Tom Reed]

That's a pretty big motor. Check the rated RPM and volume requirements to determine pump motor speed. You might need a real slow motor to turn it. As long as the seals are compatible with WVO it should work good.

[veggie]

Thanks Tom....

Your comments made me double check and the ports are actually 1/2".
Unit is rated at 4 gpm at 2000 rpm.
I plan to direct drive it at 1750 motor speed.

veggie

[mobile_bob]

off the top of my head, that unit probably needs about 4hp to direct drive it to 2000psi
however for no more than a 100psi, maybe a half horse will do?

a spur type pump can be used as a motor and visa versa

bob g

[veggie]

Thanks fellas,

I will proceed to build my pump 

[Jens]

In case you haven't already figured this out, be sure and pump only clean oil !
Although you can't beat the price of your hydraulic motor (free), I found that diafraghm (sp???) pumps are the cat's meow for transferring veg oil. They can be had as either air driven (my choice) or motor driven and they can accept some crud without complaint.
If there is any chance you might play with hydraulics at a future time, I would suggest saving the motor for that duty and look for a diafraghm pump instead. Oh, these pumps are not usually rated as high pressure (100 psi) pumps if that is required for your application.

[Tom Reed]

I use a sureflow chemical pump. It's a similar to an RV water pump, but goes to 60 psi is 12vdc and has a chemical resistant diaphragm and valves.

[LowGear]

A Confession.

I pump #2 diesel from ground tanks to 55 gallon drums on the back of a pick up with one of those cheesie garden hose pumps hooked up to a very cheap but pretty fast turning 1/4 inch drill motor.  I also suck the pretty clean stuff off the top of the crap you find in a waste oil cubie at the quick and dirty greasy spoon cafes.  

Yes, I have one for each application.  And yes the WVO unit does get clogged and has to be run backwards.  Get this; It does move oil in reverse.

Casey

[Tom Reed]

I used one of those and it worked ok for a while, but I think the oil took out the rubber vanes in the pump. The sparking brushes on the drill motor around fuel makes me nervous too.

[LowGear]

At about $9 a pop I can do one of these a year and not get too excited.  The trick for good flow is a high speed drill motor.  I tried my 3/8s work horse drill the first time and even with it primed it wouldn't suck.  Success arrived with the cheapest 1/4 inch (twice the RPMs?) unit I cold find at Lowes. 

Wow.  Fire has never crossed my mind at atmospheric under 120 degrees F concerning WVO or even diesel for that matter.  I've played a lot (you're only thirteen for a decade or two) with gasoline, matches and cigarettes.  At 40 degrees I could toss a lite cigarette into a parts washing pan that had an inch of dirty gasoline in it - they'd go out.  Try it in the summer and Woshhhhh.  One summer we learned that one puddle would flash over to another puddle that was over five feet away.  Awwwwww, those were the days.

Casey