I have 2 cat 530 pump heads that I want to have resleeved. Only 3 years old and have replaced vaklves and seals. Max pressure iI can get is 1000psi. Nothing has changed on the application, plumbing etc. Old pumps were 20 years old and were starting to leak oil etc. Have kept them for spare parts. Used one head from an old one and swapped with one of the newere ones and the problem went away.