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Tractor Talk Discussion Forum

Hydraulic reservoir size

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Carl Schwab

11-13-2007 19:59:29

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The hydraulic pump on my 1085 MF is fading fast adn I don't wan't to invest the time or money in splitting it to repair or replace the pump. I have an old PTO hydraulic pump from a farmhand loader. It is a Griesen and turning it by hand, I calculate it should put out about 15 gallons/ Minute @ 540 RPM. That should be plenty to run the loader on this tractor. My question is, how much reservoir capacity should I have for this pump. I know most of those old farmhands had the little flat 4 or 5 gallon tank hangin on the back, but all the books and websites that I consult on hydraulics say that you should have a reservoir volume equal to the pumps GPM output.

Anybody have a theory on reservoir size!!!

Carl

Fonder and Schwab Auction Service

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Carl Schwab

11-14-2007 09:00:45

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Re: Hydraulic reservoir size in reply to Carl Schwab, 11-13-2007 19:59:29

I know all the hydraulic resources say 1 to 2 times pump capacity, but I look at many systems in use on tractors and it is way less than that. On the old Gleaner combines I used to have they ran all the hydraulics and the hydrostatic drive on 28 quarts of oil.

I wonder if an open center system that is used basically for a loader really generates that much heat?

I know the reservoir is supposed to : 1. hold oil for the system to operate, 2. allow for cooling of the oil, 3. allow air and suspended particles to dissipate or precipitate.

Anything I am missing??

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Gerald J.

11-14-2007 11:09:06

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Re: Hydraulic reservoir size in reply to Carl Schwab, 11-14-2007 09:00:45

Lots of those tractor systems do heat a great deal. And some include a hydraulic oil cooler separate from the reservoir.

I don't remember much heating on my MF-135 with MF-236 loader with its own PTO or front mount open center pump. You do get more heat by jamming the cylinders to the ends and opening the pressure relief valve.

Gerald J.

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JDB

11-14-2007 05:58:39

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Re: Hydraulic reservoir size in reply to Carl Schwab, 11-13-2007 19:59:29

Ratio should be 2 to 1. For every one gallon of pump capcity, there should be 2 gallons in the resevoir for cooling purposes.

This is just what I was taught take it for whatever you think it's worth.

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Gerald J.

11-13-2007 20:06:05

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Re: Hydraulic reservoir size in reply to Carl Schwab, 11-13-2007 19:59:29

If you have double acting cylinders you don't need much extra oil, but in most simple systems the reseervoir is the oil cooler and that's what sets the size, and it probably should be based more on surface area. Probably could use a smaller reservoir by running the return oil through a finned cooler or radiator.

My MF-236 loader uses the right pedestal of the fixed frame for the reservoir when using a PTO or engine drive pump.

Gerald J.

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