Posted by Janicholson on August 03, 2013 at 19:05:43 from (74.60.94.18):
In Reply to: W-6 Hydraliic's, posted by Kansas Kirk, on August 03, 2013 at 18:27:07:
Assuming it is a live pump on the distributor drive (or front of bolster direct driven). The pump is used on an open center hydraulic circuit. This means the valve must be an open center valve. The pressure from the pump goes to the illet to the valve. The exhaust from the valve goes to the reservoir. The reservoir is attached to the suction side of the pump. This allows the fluid to operate in a circle including the reservoir. When the valve is moved (single acting) the fluid is directed to the cylinder moving the piston. When the valve is returned to center, the oil is held in the cylinder, keeping it extended, and the open center is still flowing oil to the reservoir as before. when the valve is moved to lower, the pump fluid still flows through to the reservoir, and the fluid from the cylinder is now allowed to also return oil to the reservoir, lowering the cylinder. In a double acting valve, the fluid flows just as above with the valve in the middle. WHen moved to lift position, the iol is directed to the bottom end of the cylinder. At the same time the retract end of the cylinder is allowed to bleed oil into the reservoir. When the lever is returned to center, the oil in the cylinder is held in the cylinder (both sides of the piston) and fluid travels through the center to the reservoir as above. When the lever is put in the lower position, the oil is directed to the retract side of the cylinder, and the extend side is blead into the reservoir. I hope this helps. Jim
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