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Massey Harris & Massey Ferguson Tractors Discussion Board

Re: Factory made hydraulic return port


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Posted by DavidP, South Wales on November 21, 2009 at 09:26:08 from (78.150.8.252):

In Reply to: Factory made hydraulic return port posted by jack in nb on November 20, 2009 at 15:19:11:

Return point.
Hello Jack,
Whilst the return point on the side of the cover may be used, (done it myself) it is not the best place for the return line. Depending on the circumstances of the valve, pipework and implement being operated it may not be big enough.
If you are operating a single acting ram such as a trailer the problem will occur when you want to let the body down. Oil from the pump is sent around the circuit and back to this return point.
In order for the trailer to drop the oil in the cylinder also has to come down this line. So, in effect you have two lots of oil trying to pass through a hose which is probably 3/8" bore. Even if the hose is 1/2" it still has to go through the 'restrictor' which will be the fitting in the cover. The return line MUST be larger than the supply and all fittings kept as large as possible.

DavidP


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