Slow moving FEL

[leonz]

Since mine is taking almost twice that time, I can pretty much assume the pump is due for replacement. Took a while but I think we have gotten it narrowed down to justify buying a new pump.

Now the question is, are there any Yanmar models that used a larger gpm pump that might fit mine. Even with a little adapting. Surely they all weren't the same gpm

Gary you are limited to the same pump gear size as your reservoir is only so big.


The sure way tro see if the pump is ready for scap bucket basket ball is to do the following;


1.remove the pump and fully drain the gear case(s) of the pump

2. put the pump in vice with pump inlet side on the top.

3. pour some warm hydraulic oil in the inlet side of the pump.


If the oil stream is larger than a pencil lead in diameter its time for a new pump.

happy new year

 

[Gary Sweat]

Gary you are limited to the same pump gear size as your reservoir is only so big.


The sure way tro see if the pump is ready for scap bucket basket ball is to do the following;


1.remove the pump and fully drain the gear case(s) of the pump

2. put the pump in vice with pump inlet side on the top.

3. pour some warm hydraulic oil in the inlet side of the pump.


If the oil stream is larger than a pencil lead in diameter its time for a new pump.

happy new year

Thanks, I'll give that a try and see how much oil comes out.

As to the reservoir size, I can't fully go along with that. I know it's been covered many times and everyone will say it has to be a certain size but I have observed something about tractors that have a gear transmission and use the oil for the hydraulics.

This summer, I checked on the oil temperature while using the loader. After two hours of running around in the woods cutting underbrush with the loader and pretty much using it full time cutting up about 2" of topsoil and dumping, the transmission never came close to getting warm, let alone hot. I felt the steel lines on the loader and they were not even warm. I checked the oil in the transmission by putting a sucker tube in it and it was barely warm to the touch. It holds 5 gallons with the loader. It wasn't all foamy either. I think if the oil can keep cool, less oil can be used and not do damage. If it did, an oil cooler can be added. Now that its winter, forget it, the transmission case never even gets close to being warm.

 

[Jbrink64]

Can you verify this in math please....

This how I make it....

3/8=0.375

cross section area for 3/8" hose =0.375^2*pi/4= 0.1104466 sqi

4gpm = 4*231 cui/min=924/60= 15.4 cui/sec

velocity=15.4/0.1104466=139.4 inch/sec=139.4/12=11.6 ft/sec

see
https://spreadsheets.google.com/ccc?key=0AgccLk48zZpwdHJSRm95bnFGZV95eDBMV05aSUZxTmc&hl=en

http://hydraulics.eaton.com/products/pdfs/W-HYOV-MC002-E2_Application_Data_4-39.pdf

page 11 has the flow charts I use.

 

[AKKAMAAN]

http://hydraulics.eaton.com/products/pdfs/W-HYOV-MC002-E2_Application_Data_4-39.pdf

page 11 has the flow charts I use.

Checked it out, and your Eaton Nomogram is wrong...
Even this Eaton nomogram on page 51 is wrong. Their calculations are based on good formula, but.... the nomogram just do not match it

It is possible that Eaton calculates min diameter for hose with crimped fittings on it....but that is not the common industry std used by everybody else....
Found this Eaton pdf from Germany, and it shows in metric, but after converting numbers, this Eaton nomogram (page 87) shows the right 11.6 ft/sec

I sure liked the rest of this pdf file, especially that chart for pressure losses on hoses....gotta take a closer look at that one...:thumbsup:

try this one....shows spot on 11.6 ft/sec for 4gpm-3/8" hose


here is another thats spot on 11.6 ft/sec

a 3rd one...

4th



This one shows flow in Imperial GPM....so that will not work unless converting to US GPM's

This is the reason I do my own math for velocity in hoses....Be careful with these nomograms, make sure they use US gallons instead of UK gallons, and double check with a few nomograms, to make sure you get the right info....