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cob_crusher 
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Joined: 20 Dec 2011
Location: locke, ny
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 Topic: inexpensive way to measure pump flow -- gpm
Posted: 31 Mar 2018 at 5:41am |
what is an inexpensive way to measure if hydraulic pump is working ok. do most people just use pressure gauge on remotes or could you use a water gpm flow gauge like at surplus center plugged into remotes.
without an expensive flow meter what is a substitute for on the farm mechanic.
thanks
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ac 200 7080 653 da d90.06 6265 f400 ol 77 1650 jd 4230. the reward of suffering is experience. ignorance is bliss. no muff too tuff. i am only responsible for everything. free whiskey naked women.
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jaybmiller
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Location: Greensville,Ont
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Posted: 31 Mar 2018 at 6:18am |
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Well for starters do NOT buy and use THAT flowmeter ! It's only rated for 325PSI ,so it'll shatter and at the very least make one mell-of-a-hess. Worst case the plastic pieces WILL find you !!
You'll need something rated for say 5000PSI for say a D-14 pump, newer tractors maybe 2000 PSI (?). Maybe google 'high pressure hydraulic flowmeter'
If you know the actual PSI of the oil and the cylinder dimensions, it's fairly easy to calculate the flow(GPM). Just measure the time it takes to extend a cylinder. Then either do the math or plug into an online hydraulic formula. It'll work 'backward' and figure out GPM for you.
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DrAllis
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Posted: 31 Mar 2018 at 8:03am |
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That could work if it was used correctly. There are two kinds of hydraulic flow-raters.....in-line and free-flow back to sump. This would work installing the pressure gauge and then needle valve before the glass tube to load the hydraulic pump and return the oil back to sump. Sometimes flow rating needs to be "in-line" with full system pressure and this would not work for that. There are glass tube designs that will work, just not this one.
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MACK
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Posted: 31 Mar 2018 at 8:51am |
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I have some used flow meters that might work for what you are doing. MACK
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Joe(TX)
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Posted: 31 Mar 2018 at 9:04am |
The pressure rating only matters if you are testing under load. It is ok if you do not allow the back pressure to go too high. A flow meter for water will not be accurate for oil. Close but not the same.
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DiyDave
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Posted: 31 Mar 2018 at 6:23pm |
I use an old hydraulic load tester, made for IH, by OTC. Bought it at an auction, fer like $50, years ago. I think it only goes up to 10 GPM, but that's about all old tractors had... 
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steve(ill)
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Posted: 01 Apr 2018 at 9:09am |
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normally a pump can not build up its rated pressure, if its worn to the point that it cant develop proper flow............. First thing to do is measure the PSI and see if its adequate.. THen filling a cylinder in so many seconds is one way to get an approx. flow.
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Stan R
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Posted: 01 Apr 2018 at 11:29am |
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If the flow meter is based on water, you can adjust the flow rate by multiplying by the ratio of the specific gravity of water to oil.
Close enough for the accuracy you may need.
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cob_crusher
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Posted: 01 Apr 2018 at 2:46pm |
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mack - what make & model # did you use ? what was approx cost ? thanks
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ac 200 7080 653 da d90.06 6265 f400 ol 77 1650 jd 4230. the reward of suffering is experience. ignorance is bliss. no muff too tuff. i am only responsible for everything. free whiskey naked women.
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cob_crusher
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Posted: 01 Apr 2018 at 3:29pm |
3/4 ports 5000 psi for $ 348
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ac 200 7080 653 da d90.06 6265 f400 ol 77 1650 jd 4230. the reward of suffering is experience. ignorance is bliss. no muff too tuff. i am only responsible for everything. free whiskey naked women.
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Fred in Pa
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Posted: 01 Apr 2018 at 4:44pm |
    Here is what I use , I made this years ago works great .
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cob_crusher
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Posted: 01 Apr 2018 at 6:23pm |
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thanks for info. i found website & will get a price tomorrow.
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ac 200 7080 653 da d90.06 6265 f400 ol 77 1650 jd 4230. the reward of suffering is experience. ignorance is bliss. no muff too tuff. i am only responsible for everything. free whiskey naked women.
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MACK
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Posted: 01 Apr 2018 at 9:49pm |
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The ones I have are a flow tube. 25.00 for one if they are clear to read. Can check on them tomorrow. MACK
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Gerald J.
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Posted: 02 Apr 2018 at 9:38am |
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A 3" x 8" cylinder takes 56.55 cubic inches of oil for a full stroke. Multiply cubic inches by 0.00433 to get liquid gallons, so the 3 x8 cylinder has a volume of 0.244856 gallons.
If the cylinder takes 60 seconds for a full stroke that says the flow is 0.244856 gallons per minute. If the cylinder takes ten seconds the flow is 6 times higher, 1.47 GPM.
If the cylinder takes 2 seconds the flow is another 5 times higher, 7.34 gpm, 1 second the flow is 14.9 GPM. For other times, 0.244856 x 60 / stroketime(seconds).
For higher flows a fatter and/or longer cylinder would be handier. A 5 inch x 12" stroke cylinder would have a volume of 235 cubic inches, 1.020232 gallons, so a 1 second stroke time would indicate a flow of about 61 GPM, 2 seconds about 30 GPM, 3 seconds 20 GPM, 4 seconds 15 GPM, 6 seconds 10 GPM.
Gerald J.
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MACK
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Posted: 03 Apr 2018 at 6:58pm |
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The ones I have are up to 5 gpm 3000 psi. MACK
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