As said, check the system pressure first and if you can't do that then add a .010" shim to the implement relief valve. If that doesn't work, take that shim out before you fix anything else before you forget.
Could be a weak charge pump, bypassing cylinder or valve. I doubt many of these valve get worm out by cycling but more likely scarred from sitting and rusting then forced into moving.
But start with the pressure to save a lot of time.
|