I am getting a leak from the plug on the bottom of the hydraulic tank. I have been seeing small amounts of hydraulic oil on the ground for a while but sometimes it doesn't come (intermittent). When our service guy came last time it wasn't leaking. He tried tightening up some connections through the side holes on the machine but I guess that was unrelated because today I discovered where the leak was coming from. I took off the small bottom plate on the machine (not knowing what was underneath) and after cleaning it off observed that the hydraulic is coming from the plug. I am attaching a picture. What can go wrong with this? I don't know how the plug is designed and I don't want to touch it until I understand better. Is there a way to tighten it or is there a seal that could go bad? What is the best option to fix it?
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