Well, you know Rainbow does not make motors.
Is there a label on your existing motor?
Take a look at this pic. They are showing Ametek Lamb numbers for the Numatics.
I suspect that you have one of these.
It should be a 2 Stage 5.7 - 240v motor.
Just look up some of these motors and see if they match up.
Ametek Lamb parts should be easy to find.
some more possibilities below, again these are probably Lamb motors with a Numatic number on them
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Here is a diagram for a Numatic WV470:
http://siteassets.ransomspares.co.uk/Files/Numatic/Diagrams/EXP-0369-1.pdf
motor - 220561 230V thermal overload
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Original Numatic 2 Stage 5.7 - 240v
42-VM-197
Compatible with:
Charles CVC370 Vacuum Cleaner
WV370 Commerical Wet or Dry Vacuum
WV380 Commercial Wet or Dry Vacuum
WV570 Industrial Wet or Dry Vaccum
WVD1800AP Industrial Wet Vacuum Cleaner
George GVE370 Vacuum Cleaner
CT370 Spray Extraction Cleaner
NTD2003 Vacuum Cleaner
WVD1800DH Industrial Wet Vacuum Cleaner
WV900 Industrial Wet or Dry Vacuum
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