The Trane MOT18985 Blower Motor is a genuine OEM replacement motor designed for compatible Trane and American Standard heating, ventilation, and air conditioning equipment.

Featuring 1/2 horsepower, 460V single-phase operation, 850 RPM, and a two-speed configuration, this motor provides the mechanical power needed to operate compatible HVAC blower assemblies.

What Does This Part Do?

For homeowners and building owners, the blower motor is responsible for turning the blower wheel that circulates heated or cooled air throughout the building. Proper airflow helps maintain comfortable indoor temperatures and supports efficient HVAC operation.

When a blower motor begins to fail, you may experience weak airflow, unusual noises, overheating, intermittent operation, or a complete loss of air circulation.

The Trane MOT18985 features a 48-frame design, belly-band mounting, and clockwise/counterclockwise rotation capability. It is designed for compatible higher-voltage HVAC equipment.

This motor is also listed as a replacement for the discontinued Trane MOT04741.

Key Features & Function

• Brand: Trane / American Standard

• Manufacturer Part Number: MOT18985

• Product Type: HVAC Blower Motor

• Horsepower: 1/2 HP

• Operating Voltage: 380–415/460 VAC

• Electrical Phase: Single Phase

• Frequency: 60 Hz

• Rated Speed: 850 RPM

• Additional Listed Speed: 700 RPM

• Number of Speeds: 2

• Frame Size: 48 (some catalogs specify 48Y)

• Rotation: CW / CCW

• Enclosure: Open Air Over (OAO)

• Mounting Type: Belly Band

• Shaft Diameter: 1/2 inch

• Shaft Length: 4 inches

• Suggested Run Capacitor: 10 MFD / 370 VAC — verify nameplate

• Previous Part Number: MOT04741

• Application: Compatible Trane and American Standard HVAC blower assemblies

  HVAC Depot Pro Tip

  If your HVAC system is experiencing weak airflow, unusual motor noises, overheating, or a blower that fails to start, the motor may not be the only component requiring attention.

  Before replacing the Trane MOT18985, a qualified HVAC technician should inspect:

  • Motor run capacitor and capacitance rating

  • Incoming electrical voltage

  • Blower wheel condition and alignment

  • Motor bearings and shaft

  • Wiring connections and speed-selection terminals

  • Motor rotation direction

  • Airflow restrictions and dirty air filters

  • Motor operating amperage

  HVAC Depot Pro Tip: The MOT18985 is a high-voltage, single-phase motor with two available speeds. Proper speed selection is important for maintaining correct airflow through the HVAC system.

  Important: The suggested 10 MFD / 370 VAC capacitor specification must be confirmed against the replacement motor nameplate. Do not install a capacitor with an insufficient voltage rating.

  Safety Warning: This motor operates at high voltage. Disconnect and lock out electrical power before servicing. Installation should be performed by a qualified HVAC technician.

  Equipment / Model Compatibility

  The Trane MOT18985 is designed for select Trane and American Standard HVAC systems requiring this OEM blower motor.

  Previously Listed Replacement:

  - Trane MOT04741 (also written MOT4741)

  Before purchasing, verify the following:

  • Complete HVAC equipment model number

  • Equipment serial number

  • Original motor part number

  • Required 1/2 HP motor rating

  • 380–415/460V electrical requirements

  • Single-phase operation

  • Required 700/850 RPM speed configuration

  • CW / CCW rotation requirements

  • Frame size and belly-band mounting

  • Shaft diameter and length

  • Motor run capacitor specifications

  Compatibility Notice: The MOT18985 is not a universal blower motor. Matching horsepower, voltage, and RPM alone does not guarantee compatibility.