Testing a PTO pump

[AKKAMAAN]

Akkaman,

You've just brought back a memory of a "Shop Tour" I did 3 yrs ago while visiting family in Miss.....(I always have to snoop around when wandering off out of town:laughing

This company....http://www.geartek.com/......their test stands for new pumps were using gear motors with photo tachs on the output shafts to determine GPM output...... the exact principle you speak of here......They had several test stands with different setups and some rather large displacements.......


:thumbsup:

Thx for verifying I wasn't dreaming....honestly, I had never heard of it before ...it hit my mind when you mentioned the bucket method...(which I have practiced on small pumps)

EDIT: I used to have access to one of these old Webster test units, and later I bought 3 different Hedland inline meters for my test&trouble shooting kit

 

[mmurphy]

Bucket test is the only way I have had to test, except for a place I had worked in the past. I figured no one just would do it that way anymore.

 

[kennyd]

The 5 gallon bucket is an interesting and ingenious approach and I may have use it if I can't find the capacity of my pump. The pump I have is a Prince C-387 and it is similar to the one J.J. linked me to.
While back I did inquire the company about the specs, but do you think they would give me specifics? Nooo!, they just linked to newer models, but no straight answer.
Anyway, I just about convinced myself to install the tank in back of the seat.
The tank I have is about 5 gallons which should be sized with the pump I am using. Tank capacity 2X pump gpm. Is this the general rule? Or can I go 1X1 for a loader?
I guess before I do anything I need to find the pump gpm. Does anybody have a clue about the capacity of this Prince C-387 pump? I would love to hear from you.
I have an attached sketch of the test system I have in mind, minus flow meter (these meters are gorgeous, but pricey, maybe later, right now I have other priorities).
Just want to confirm if this system is doable.
Thanks for all the help so far.

Put that needle valve between the valve and the cylinder, not in the feed line to the valve.

 

[NCMau]

Thanks for all the tips, especially the safety tip. Now I have few options when I get to that point. I still would like to know about the ratio of pump gpm vs size of tank. What is the minimum I can get by for a loader?

 

[J_J]

Some people on here say 1 to 1. but it used to be 3 to 1.

Tank gal to pump GPM . A cooler and fan would help to dissipate the heat.

 

[AKKAMAAN]

Thanks for all the tips, especially the safety tip. Now I have few options when I get to that point. I still would like to know about the ratio of pump gpm vs size of tank. What is the minimum I can get by for a loader?

First of all, you have to design so you don't create excessive heat in your system...That's done by keeping fluid velocity slow in hoses, valves etc...
Do not be "cheap" when sizing hoses and valves...better over size than under size when it comes to avoid overheating....

Another thing is to turn of the PTO pump when you do not use the hydraulic implement

The viscous friction in oil, increases with increased velocity....use recommendation nomogram for all hoses and lines, and choose a valve that can "handle" the max flow with out excessive pressure drop...
Here is a useful pdf file from Parker that have a sizing nomogram on page 14