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Hydraulic flow meter

S

SVcummins

Well-known Member
Anyone do a hydraulic pump flow test by plugging a hose into
an scv with a gate valve and pressure gauge and dumping the
oil back into the hydraulic fill port
 
I was wondering about a Hydro pump flow test for my Zmower hydro pump,
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I thought id learn something and fix it, well i dident fix it so wonder if i could take it some were to be tested. So i cant answer your question, once i took the pump apart i saw this China bearing went bad blew out the seal, I figured why not replace the bearing and seal and I should be good as the pump worked fine before this happened, put it back in mower and I couldn’t get it to pump oil , well over $600 later new pump on ebay im up and running. But it still irritates me it wouldn’t work after just replacing those two bad parts?? How did you make out at the local hold em and screw em with that oil cooler?
 
Didn’t do bad 😀 at all i was surprised actually. They tested the cooler and found it just had some bad hoses replaced the hoses and pressure test was 110$ didnt feel to bad about the deal , went a lot better than the 350$ carburetor rebuild for my dump truck my butts still a bit sore after that one. Funny that pump wouldn’t work again,
 
Well thats good on the oil cooler, i don’t remember what kind of dump truck you have. I think you posted awhile ago about a dozer you had, were fixing something with the tracks?? Maybe you finished it and posted it here and i missed it, at least i thinks it was you that was fixing one. ??
 
The dozer project hasn’t been done anything with for awhile maybe this winter. Dump truck is a 72 gmc 2 ton truck
 
Sure. Shop where I worked had a box with gauges which measured flow and pressure, and a knob you cranked down to load the system. It was blue, just like the M&W dynamometer, and worked similarly, but I think it was made by OTC. I discovered, the hard way, that thankfully, it had little safety relief plugs inside. I was out on a farm working on a problem tractor, when something finally seated in a hydraulic pump, and flow went from near nothing to something, like now, and the tester popped its cookies. Tractor now working, tester junk. I dutifully reported to the boss, who dug into it, and found the plugs. We were all relieved!
 
a test there will tell you what you have at the remotes but does nothing for pump condition or if you have a leak between the pump and remote outlet
 
I have tested every other part of the system i am down to testing the main hydraulic pump output to see what it is doing
 
Jay, Probably the reason that pump won't bleed is the metal from that bearing went through the check valves into the high pressure circuit and caused damage.

When you change a pump that does that you are supposed to check every elbow and Tee fitting on the return back to the tank to be certain there isn't any metal lodged in there. Dragging a magnet around in the bottom of the tank is also a pretty good idea. Although the filter would probably catch it, no sense in taking chances.
 
I thought about that, I did blow compresed air threw it, but im gonna look at it better this winter, i also did get metal pieces out of the pump, but theres a chance i could have missed some as you said.
 
Your idea of using a gauge and a gate valve in a hose is a poor man's flow rater and it does work. You have to have the gauge between gate valve and scv. With gate valve fully open you will be measuring free flow. When closing gate valve you start testing pump.

The problem is measuring the gal's per min. You need to dump into a container and time how long it takes to get a specific amount of oil. Of , course, that container is going to fill real fast so you have to stop and dump it back into system.

Or, another gate valve to direct it one of two ways,one into container and a quick switch into system.

Now, as far as blowing the safety valves on a factory flow rater and have oil all over, I would say that was a early flow rater that was not an inline flow rater. In other words, the return had to be totally unrestricted right to dump. An inline flow rater, you can return oil right back through other port of scv or downstream to any other accessory in system you are testing. I know about the mess, have done it.
 
I am thinking about overfilling by 5 gallon and then running the test for 30 seconds and dumping the output onto two five gallon buckets
 
Thank you t.r.k. I looked into pump tonight, never would have pumped in a million years, i ended up learning something after all, take your time and check things out more thoroughly
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never took the top off for bearing and seal, so i didn't see this, looks like i can get a kit still, clean pump out really good, fix it and have a spare?
 
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