Got some photo's on the web.
http://www.yesterdaystruck.com/trphotos/a2041.jpg Here's all the guts of the hdyraulics. Note the outside of the middle ram is BADLY rusted. It doesn't move very well. However, the smaller ram moves just fine. I'm looking for a place to refurbish these if possible.
http;//www.yesterdaystruck.com/trphotos/a2042.jpg
Here's the hydraulic pump and valve. Gresen seems to be a good name.