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hydraulic reservoir

B

Bob seND

Member
Just mounted a small loader (Leon 636) on my Oliver 1555. It's a loader special, so no hydraulic system. I'll run it off a PTO pump (yellow), I don't know the output. I need to mount a reservoir.
It doesn't seem like the rule of thumb of double the pump output for size is necessary for the small loader. I assume the pump is 11-15 gpm. A 10 gallon tank fits a lot better than anything bigger.
What's the experience out there with this? Do I need a 20 gallon reservoir?
 
Are all the loader cylinders double acting or single acting? If single you need a lot more reservor to hold the oil comming back in when the cylinders are colapesed. Double you just need a bit more than the biggest volune of the cylinders just enough to allow for the rods. You would only need perhaps a quart over the mim-max that the cylinders displace. Anyextra would be for cooling or reserve for a leak.
 
I don't know what this one holds,never drained and refilled it,but I seriously doubt there's over 10 gallons tops in it. You can see where the filter and filler hole are. That upright is the extent of the reservoir as far as I know. It has two way cylinders and a separate pump above the PTO on the back of it.
a140021.jpg
 
For a loader 10 gallons should be OK because the loader isn't running continuously. The pump is but the oil is just recirculating. If you were running something like a hyd. drive brush cutter, then you'd need a bigger reservoir and/or an oil cooler.
 
My Ford 841 has a 5 gal tank on it and the pump is a 8-10GPM pump and we have never had any problems with it in the 30 years we have owned it. As long as the tank is big enough to fill the cylinders and keep oil moving in the pump it is big enough.
 
You need a 45 second dwell time or longer for the oil to deaerate. 45 seconds is 3/4 (0.75) of a minute. Low side at 11 GPM, is 11 X 0.75 = 8.25 gallon tank. High side at 15 GPM is 15 X 0.75 = 11.25 gallon tank needed.

A 10 gallon tank will be about right for a 13 to 13.5 gallon per minute pump. 10/0.75 = 13.33 GPM pump.
 
Ya as long as the pump does not run out of oil the system will work just fine be it a 5 gal tank or a 30 gal tank. As long as the cylinders are full of oil and the tank can provide oil to the system at all times your good to go
 
Duty cycle time gets into this. Also make sure the oil return to the reservoir and reservoir outlet port are across from each other. Keep an eye on the oil temperature.
 
There are a lot of variables in here. You did not say at what engine speed you are running the tractor as the published pump output is at one RPM. Also if your 1555 had an Oliver hydraulic system the pump would be rated at about 15 GPM the reservoir would hold from 5-6 gallon and the tractor would have a factory installed oil cooler in front of the radiator.
 
The Reason for the "Rule of Thumb":Reservior size=
twice pump capacity, in Gallons per minute...
is to prevent overheating. Check the oil often, Feel..if too hot to touch with bare hand, you
should check for Burnt oil Smell.
 
Go to a salvage yard and get a 5-10 gallon tank from a combine......I have a couple from a 15 series IH on my "nummy shelf" for future projects....bet it"ll do fine for your loader. My reversed AC loader (all hydraulic) that I made in the 70s has maybe a 5-7 gallon tank.
 
I put a loader on my first tractor (JD 420) about 40 years ago. At the suggestion of my neighbor, I used an air brake tank off a truck, and mounted it vertically inside the upright- I didn't know any science about size of reservoir vs. flow rate, but guess I had dumb luck- worked great.
 

I have a Farmhand F11 loader on a Farmall M. I am using the belly pump as a reservoir. The belly pump holds about 2 gallons when over-filled. Initially I had to raise the loader as high as it would go, add more oil to the reservoir, and then cycle the loader, add more oil, etc., etc. Eventually I was able to extend the loader to its full 17 feet lift height. All with only 2 gallons or less in the reservoir.
 
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