Return line hydraulic filter

Anonymous-0 · Apr 21, 2009

I have a massey ferguson 180. Wasn't made with a return line hydraulic filter, but a dealer suggested I install a 10 micron spin on. I got one from the local hydrauic shop with a pressure gauge to monitor filter health. Idle pressure is around 15 psi, but higher rpms sends pressure to around 40 psi. My filter base is 15 psi bypass pressure. Am I really not filtering at higher rpms? Hurting anything? Helping anything?

Bob · Apr 21, 2009

Not to mention the 40 PSI opening the bypass and not filtering the, what is filter rated for? A pressure surge might rupture the filter.

IMHO, you need a LARGER GPM capacity filter to handle the flow without being so restrictive.

pat sublett · Apr 21, 2009

Restriction, too small of a hose or or other issues between the filter and tank, including tank entrance being too small, could also cause high pressure. As long as you don't burst the filter it would still be somewhat effective when the pressure is low. You may have a screen in the entrance to the tank that is stopped up. I am sure if it didn't origially have a filter that there is an inlet screen.

mEl · Apr 21, 2009

The pressure should be checked on the return side after the filter as well to get a true indication. If the restriction is on the return side of the filter the pressure could be high at both points and the bypass would not open even at 40 plus pounds as it would have 40 pounds on the backside of the spring in the bypass. If the filter has a true 15 lb bypass and the return was large enough then it would seem that the max pressure you could read would be 15 lbs if there was minimal restriction in the downstream return. If there is a truly "free flow" with no restriction on the return then agreed, a larger GPM capacity filter is in order. You need to check both sides of the filter for pressure at the same time, maybe you need larger return plumbing to lower the return pressure, Check it. I'm betting your return is to restrictive. mEl

Anonymous-0 · Apr 22, 2009

Thanks for the input mEL. I talked to someone at the company that manufactured the filter and he explained the differential pressure to me. The return hose on my tractor leads to a manifold and then the pump where it is recirculated or returned to the sump. So I presume that is where the backpressure comes from. The new filter hoses/filter openings far exceed the size of the original (bent/dented) steel tubing. The pump is rated at only 9gpm max. Thanks

mEl · Apr 22, 2009

Good, as long as the pressure is equal across the filter the bypass will not open, when the filter becomes restricted and 15 lbs DIFFERENTIAL pressure is exceeded then the bypass will do its job. Sounds like you've got a handle on it. mEl

Return line hydraulic filter

Anonymous-0

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Bob

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pat sublett

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mEl

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Anonymous-0

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mEl

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