Cat 420D cylinder tube scored...

As above my 2002 420D IT dipper cylinder has been drifting on me and I have had to use it as is due to schedule of house build including footers,septic etc.

I finally got the cylinder off and took it apart. First thing I found was that the piston has wear marks and scrapes/gouges. The seals are worn and even torn. Then looking at the bore there are score marks from one end to the other all parallel to each other and about 1.25"'s apart. I did not find a lot of metal but I did find one...

Cat 420D cylinder tube scored...

Cat 420D cylinder tube scored...