520837 Suburban Motor 7.5 UF Capacitor P-40S 

OEM Motor + Correct 7.5 µF Capacitor for Suburban P‑40S Furnaces

This Suburban 520837 motor is the OEM‑style blower/combustion motor used in P‑40S RV furnaces. It is paired with the correct 7.5 µF run capacitor, ensuring proper startup torque, correct RPM, and stable airflow for ignition and heating performance. Matching the motor to the correct capacitor value is critical in Suburban furnaces—incorrect capacitance leads to slow starts, overheating, weak airflow, and ignition lockouts.

The motor is built for the P‑40S platform and matches the original mounting footprint, shaft length, rotation, and electrical characteristics for a direct, no‑modification installation.

Key Features

• OEM‑style Suburban P‑40S furnace motor

• Includes or requires the correct 7.5 µF run capacitor for proper operation

• Provides correct combustion‑air and circulation airflow

• Factory‑matched rotation, shaft length, and mounting pattern

• Restores proper ignition, heating output, and safety performance

• Designed for high‑temperature RV furnace environments

Why the 7.5 µF Capacitor Matters

• Ensures the motor reaches full RPM for ignition airflow

• Prevents overheating and premature motor failure

• Reduces nuisance lockouts caused by low airflow

• Maintains proper amperage draw and efficiency

Common Symptoms Indicating Motor or Capacitor Replacement

• Blower slow to start or fails to reach speed

• Furnace cycles without lighting

• Motor runs hot or trips thermal protection

• Weak airflow from registers

• Humming motor that won’t spin (often capacitor‑related)