I have a Hustler 48" Fastrak Super Duty. It has the ZT 3100 Transaxles. Says to change oil and filters at 75 hrs or 1 year. Its been one year and 49 hours so I want to do it anyway. Anyone have a how to video or something? I guess its pretty simple but have never done it before. And how do I know how much grease to put in when doing all the grease fittings on the machine?