So, 644e started a fast drip of oil out of the boom cyl on the right side, closer inspection shows its not coming around the shaft but what looks like the cylinder rod guide, so there looks like a few o-rings in there. R98669 backup ring and H88900 o-ring look like the culprit, being the only other seal that's not the outer rod seal.
My question is, I'm familiar with small hydraulics up to the CK580, they have the piston held with a big honkin bolt with a large amount of foot poundage, all I can see on the JD parts explosion is a snap ring? Does a snap ring hold back a bazillion pounds of force when putting down pressure on the hydraulics? It might be nutless as its using a woodruff key from keeping any rotation to a minimum, not even sure how to pick the boom cylinder up to work on it!
My question is, I'm familiar with small hydraulics up to the CK580, they have the piston held with a big honkin bolt with a large amount of foot poundage, all I can see on the JD parts explosion is a snap ring? Does a snap ring hold back a bazillion pounds of force when putting down pressure on the hydraulics? It might be nutless as its using a woodruff key from keeping any rotation to a minimum, not even sure how to pick the boom cylinder up to work on it!