This 8N we've talked about over the past 2 years. It is finally in working order (thank you all) but today I was using it for a short time to check out everything before putting the hood back on. After about 15 minutes of attacking a dirt pile the hydraulic oil began to squirt out the top filler hole. Some one had installed a nipple in the filler port, cut a groove in the top threads and installed a cap also with a groove in the threads to ???act as a vent??? That vent sprayed my noble body with hydraulic fluid and produced enough smoke hitting the exhaust pipe to spay for mosquitos! I included a picture which hopefully explains it better. I have the manuals for the loader and the hydraulic bucket which tells me there should be 5 gallons of fluid in the rig but can it be overfilled? The second picture should show a 1/4 inch plug in the left frame member about 1/3 of the way down which might be a place to check fluid level ???? but the manual doesn't address this nor does it say much about the top fillet plug. Can use all the help I can get - the hydraulic pump works fine and someone before me must have raided his pension fund to replace almost every hydraulic hose and cylinder seals.