Welcome to the group. I hope you will enjoy your uncle's 644. We have many manuals in our Tech Library that will assist you in keeping it operating at its best. Feel free to post questions in one of the forums that is most appropriate to any problem you are having.golfcarman said:hi Im new to the forum...What a great site! Last week I finally bought my uncles 644 (after years of asking). it had a bad wine but thanks to the forum I changed the hydraulic fluid to 15w40 and it sounds great. Well Thanks for having me.