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It's probably cheaper to buy new ones. www.surpluscenter.com
Lower the hoe part that is controlled by the cylinder very slowly until it releases the tension in the cylinder pins. May be a 2 person job, but fairly easy with a soft touch.
Then take out one of the pins, usually the rod side and extend the cylinder all the way. Measure the distance from pin center to pin center. Then retract it all the way and measure. Just for giggles - repeat the measurements. Note the diameter of the rod, the diameter of the pins and the diameter of the cylinder. The cylinder inside bore is the important bit, it's usually 1/2" less than the outside diameter. Buy a replacement with the same dimentions. It's ok to go slightly larger in diameter, slightly longer in stroke as long as the retracted distance is the same.
If you know someone with a lathe and a welder, you can buy replacement chromed rod in both metric and inch sizes. Will need to put the threads on the end and weld on the new pin boss.
www.crconline.com
Repair of the rod is expensive. The costs for an excavator with 8" cylinders is not that much more than for a 3pt hoe with 2" cylinders.
They have to chemically strip off the chrome, nickel and copper. Turn the rod down to smooth. Plate up copper, nickel to the correct diameter (actually over size then turn back to true) then overplate with hard chrome. Not cheap.
jb
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