Hydraulic steering control unit replacement

I have an old Pettibone Extendo 88 forklift that I am working on some hydraulic issues this winter. I have rebuilt the Char-Lynn SCU unit, but have yet to be able to test it out.

When I got the machine the steering worked, but the SCU whined & growled like crazy, even if I wasn't touching the steering wheel. When I took it apart, I didn't see any internal damage, here are some pics:

http://ift.tt/2mBfTNW
http://ift.tt/2m3vwjq...

Hydraulic steering control unit replacement

Hydraulic steering control unit replacement