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I think the one with the plug on the bottom is a newer Parker motor. If your motor is working ok and the older one with out the plug I would just not reverse it a lot real fast. Albert

That is not good!!

Glad I could help, Yes I was blowing out the seals on the winch side and filling the winch with fluid. It was blow when I got it and had it repaired and used it two times and it did it again. Been OK so far.

Here is my understanding (lookout LOL) When you are using the motor and reverse the motor there is an area between the seals that can build up pressure and needs to be able to bleed off that pressure, that is what the case drain does is bleeds off that unwanted pressure. Are something like that...

No there was not a tap hole. I drilled and tapped the fitting for the hose. It is a return line so there is no pressure. I did add a check valve on the case drain line.

FYI, If your new Parker motor has a allen plug in the bottom side of it, you need add a case drain to it. If not you will be replacing it soon. I had my motor repaired two times before they told me it needs a case drain.