A double acting cylinder will have a hose or tube to both ends of the cylinder barrel. Depending on the action you want (lift, lower, dump, curl) pressurized oil is directed to one end or the other by the valve and at the same time the valve provides a clear path for the oil from the opposite end to return to the reservoir. Float position in the valve opens both ends of the cylinder to the reservoir. It is common, but not required, for double acting loader cylinders to have a valve with a float position.
A single acting cylinder will normally have a hose or tube to only one end of the cylinder barrel. The valve supplies oil to the end of the cylinder with a hose to move it, the other end may have an atmospheric vent or not, depending on how it is built. Gravity or weight moves the arms/bucket/etc. in the other direction when single acting cylinders are used. HTH
Are the hoses that go out to your cylinders connected directly (either threaded in or attached to threaded adaptor fittings) into the valve?
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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