If your Suburban SF-42 or SF-42F furnace has stopped pushing heat or the blower has failed, the 233103MC from M.C. Enterprises is the direct-replacement motor you need. Engineered to match the original 2-1/2" motor used in pre-2001 Suburban forced-air furnaces, this unit restores full blower function without modification. Also sold under NBK Parts number 20510.
Suburban SF-42 and SF-42F furnaces are among the most common forced-air propane heaters found in older RVs, fifth wheels, and travel trailers. Over time, the blower motor wears out -- bearings fail, windings overheat, or the motor simply stops spinning. The M.C. Enterprises 233103MC is purpose-built to replace the original 232212 motor in units manufactured prior to 2001, with identical shaft lengths, case diameter, and electrical specs so the swap is straightforward.
At 12V DC and 3500 RPM, this motor delivers the airflow performance your furnace was designed around. Both shaft ends are usable, with primary and secondary shaft lengths matching the factory configuration for direct coupling to the blower wheel without adapter hardware.
Replaces Suburban OEM part number 232212. Matches original mounting, shaft, and electrical specs for pre-2001 SF-42 and SF-42F furnaces.
Runs directly off the RV house battery system at 12 volts DC -- no inverter or converter modification needed.
Primary shaft at 1-15/16" and secondary shaft at 1-1/2" match the factory blower wheel coupling on both motor ends.
Correct motor size (2-1/2" nominal) for Suburban SF-42 furnaces built before January 2001. Use your serial number to confirm build year before ordering.
This motor is cross-listed under NBK Parts number 20510. If you sourced this part number from a service manual or dealer parts lookup, this is the same unit.
Suburban furnaces manufactured after January 1990 carry a nine-digit serial number. The first two digits indicate the year of manufacture, the next digits indicate the production week, and the remaining digits are sequential serial numbers. For example, a serial number beginning with "98" indicates a 1998 build -- which is prior to 2001 and compatible with this motor. A serial number beginning with "01" or higher indicates a 2001 or later build, which may use a different motor specification. Always confirm your build year from the serial number before purchasing.
This motor is designed specifically for the SF-42 and SF-42F models using the 2-1/2" motor, built prior to 2001. Other Suburban furnace models (including the SF-30, SF-35, SF-25, and later SF-42 variants) use different motors with different case diameters, shaft configurations, or voltage specs. Do not assume fitment based on furnace BTU rating alone -- confirm by matching part number 232212 or verifying your serial number indicates a pre-2001 unit.