Posted by Hemmjo on May 21, 2020 at 04:59:22 from (67.149.181.71):
I have an HV4901 hydraulic adapter kit installed on my Ford 860 tractor. I have a Cross, Converta-Valve set up to operate a single acting cylinder on the top link. The implement is light when empty, a concrete mixer.
It is plumbed to power up (retract) and to float down (extend). Up works fine. When the valve is activated down it will start to lower, then raise up, then lower. If I hold the valve in the down position after the implement is down, it will rise up, then go back down repeatedly in a very rhythmic manner.
While investigating, I removed the implement and used a chain between the top link and the hitch on my truck. With the lever in the down position, the tractor easily pulls to extend the cylinder, and will hold it extended with no brake applied. Moving the valve to retract the cylinder, will drag my truck if I apply the tractor brakes.
I don't believe the problem is in the valve or the adapter, but rather in the tractor. It seems like the return line may be pressurized for brief periods sometimes.
I am wondering if there is something wrong withthe hydraulics on my tractor? Maybe the empty mixer is just too light to extend the cylinder and I should switch to a double acting top link?
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