Trane GER0139 Drive Gear for VariTrane VAV Damper Actuator

The Trane GER0139 is a replacement drive gear designed for use in Trane VariTrane Variable Air Volume (VAV) terminal unit damper actuator assemblies. This plastic drive gear is a critical component in the gear-driven damper positioning system used in older VariTrane VAV boxes.

Key Features:

• Genuine Trane OEM replacement part
• Compatible with VariTrane VAV damper actuator assemblies
• Durable plastic construction designed for reliable operation
• Replacement for worn or damaged gears in existing systems
• Works with 300 RPM and 600 RPM gear motor assemblies

Application:

This drive gear is used in Trane VariTrane VAV terminal units, which control zone temperature by modulating airflow through damper positioning. The gear interfaces with the actuator motor to drive the damper's threaded rod mechanism. Common failure modes include stripped threads and wear from extended use, making this a frequently needed service part for maintaining proper VAV box operation.

Note: This part (GER0139) along with related gears GER00135 and GER00137 were discontinued by Trane in March 2022. Availability may be limited to remaining distributor stock. Also identified by alternate part number GER00139.