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I am restoring a 52 / 88 RC Diesel and just discovered that the hydraulic system does not seem to be working. My system has the box under the cowl with two levers and four connections for lines. A quick check looks like some of the parts and bottom plate may be missing, fluid added to the hyd unit drains directly into the transmission. 
Question: What do I have to do to remove the hyd unit? How can I determine what my problem is? 

Any help will be appreciated.