Use the Beam central vacuum parts that we sell to repair your vacuum unit. Not least among them are these central vac suction and powerhead motors. Try to identify the part number of your current motor before ordering a new one. If you need help identifying what motor works with your system, then give us a call or email us for assistance.
I haven't had to change the bag in my vacuum yet, but it appears to be easy enough and I like the fact that the hose end to the vacuum unit does not have to be removed in order to change the bag. This is another reason why I don't like the ProLux Terra Vacuum, very hard to replace the bag.