I have had a Coleman Super Vac/Shampooer for over 8 years, I have only ever put 1 motor on it and very seldom needs brushes. I feel the large cannister and bags draws better on the motors!! I just picked up 9 more Coleman Combo Units that I have been rebuilding, and replacing my Fragramatics and Monorail units and Everyone loves them, and so do I!!! Everytime I collect!!! These machines were very easy to work on they were left outside out of service for nearly 3 years, domes off!!!
Doors stolen!! Cleaned up solonoids, fresh decals, IDX MA800's some fresh lights and motors and away they go!!! 9 new vacs for under 9K.
One thing I have always done with fragrance machines, is every so often I take a bottle of methanol and put pickup tubes into the bottle and flush out all lines and solonoids, some of the fragrances gum everything up. dont change from water to oil base or vice versa.