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Message: <blockquote data-quote="Quad Raider" data-source="post: 31102" data-attributes="member: 3384"><p>Just finished rebuilding the VH4D on a friend's vintage Mustang 1000 skid steer loader. Solved many problems along the way, but a new one has cropped up. The drive pulley does not want to stay on the output shaft. This engine has the short, non-tapered shaft on the PTO side. The two-piece pulley slides on to the shaft and has two holes for set screws, plus a large keyway. Yesterday, while letting the engine run at idle as per the manual's recommended break-in, the pulley slid off the shaft after about 20 minutes. It didn't come all the way off, just far enough to indicate that it was loose. I have tried using two small set screws in each hole (the way it was when I disassembled it). The key has definitely seen better days, but would a new key make that much difference?</p></blockquote><p></p>