I am in the middle of rebuilding an 3pt. ARPS 730 Backhoe from the 70's,,,,,I took it to a shop near by due to the special tools needed like the pin type spanner wrench, 3 rods needed replaced so they are being cut at the ends and a new shaft is being welded back in--cost wise it is less expensive this way than to have rods resurfaced and chromed due to some gouges full length and smaller pits from rust (many of them-like freckles), at least I had all new hoses made at local NAPA and delivered to the Hyd. shop, does this count as doing it, ummm probably not. the seal kits are very in expensive SOME TIMES ! , mine turned out to be about $15.00 for each cyl. .. the backhoe is so old that it tops out at 2500psi,,,the higher pressure ones of today 3000psi can run 40-50 bucks per cyl. but from a log splitter,ummm i would not worried much about sticker shock as long as you can do it or figure on 60 or more an hour labor.
they are directional, not like an O-ring were they are all round but more square O-ring with the outer edge like a lean to roof angle to it and then several next to each other,,,some are like the rings an a piston.
Considering i picked up the backhoe for $1500, by putting another $1000 to $1500 into it I can justify it. by the way for all the hoses it cost me $450.00:drink: