The vent cap should be left on. A double acting cylinder will displace the amount of oil equal to the area of the cross section of the rod times the distance travelled. This and the fact that temperature changes the volume of the oil means that you need a vent to keep the oil at atmospheric pressure.
To reduce oil foaming the return oil needs to be returned below the level of the oil in the reservoir. If the flow is not too great it may be acceptable to allow the oil to return running down the inside wall of the reservoir. The Lift-All pump has about a 4 to 6 inch drop for the oil if returned to the fill pipe and will cause foaming.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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