Hy jhaa_lives, A good hydraulic shop can rebuild/repair all the components in the system, cylinders, pumps, filters, reservoirs, hoses and valves. If your cylinder rams have visible rust on them they should probably be rechromed, a very expensive process, you may be able to buy replacement cylinders of the correct size cheaper than repairing your old ones, I don't know what stores you have in your area that could supply them, Tractor Supply maybe, hope that helps.
