I've got a 66 c60 and I had the same problems with the flex hose between body and frame. They were totally plugged with gunk...? I'm sure all the lines are suspect. I had trouble finding a replacement at the parts store, but got one made up at the local hydraulic shop.
flex The other side was plugged too but I was able to get the line off, I bored it out with a welding rod and solvent. I'll get another flex line soon though.
Good luck!
Bill
