If the belt goes slack (because of the PTO losing vacuum) it can "kick" itself off. Haven't you ever seen a belt running that wasn't tight enough? They can really move around.
As far as the motor position goes, try it. Seems reasonable, but I really don't know that it moves enough to make a difference. If it does, great, if not, then keep looking. No, I looked through the manual and there is no "procedure" for aligning the motor and the front drive.
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