I bought a used Huskee rototiller with a 8 hp engine model #190402 type 1817-01. It was a tiller produced by or for TSC. I tried contacting them on some maintenance issues. Specifically have tried to locate the specs on the transmission oil change. What type of oil is used (assume 90 weight) and where the filler ports are. Took shield off and have found what appears to be a fill and drain port. Also unclear what quantity of gear oil to put in. (don't want to overfill). Thank you