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Message: <blockquote data-quote="Tazza" data-source="post: 102635" data-attributes="member: 82">I did a blower on a 763 last year. The bearings are pressed onto the shafts, but not a real tight fit into the aluminium housings.The ideal way is to note where the shims came from, you can adjust the side of the bearing that they go on to adjust the engagement of the gears. You don't want them too tight or too loose or they will have back lash. I am not sure what the correct figure is, but if you put it together and rotate the shaft, if it feels really gritty, you have too much engagement of the gears, install shims to pull the shaft out.Bobby - if you just need to do the seal, drill a hole and use a self tapping screw to pull the old one out.</blockquote>