Carrier 330426-409 Arm Assembly

The Carrier 330426-409 Arm and Grommet Assembly is the OEM motor mounting arm with its rubber vibration-isolating grommet already fitted, supplied as one factory replacement assembly from Carrier, the manufacturer behind the Bryant and Payne brands. Carrier lists it as an ARM & GROMMET ASSY in the 330426 arm family, the same family that includes the 330426-406 and 330426-411 arm assemblies. 330426-409 is a small HVAC blower motor mounting part, but it is the piece that positions the motor and keeps motor vibration out of the cabinet, which makes a worn one a common source of blower noise.

The 330426 dash-number family covers several arm styles, and every dash number is its own arm and grommet assembly. The 330426-409 is a separate part from the 330426-406 and the 330426-411, so do not swap one dash number for another because the arms look close. Read the number off the old arm, then confirm the full model number and serial number from the unit nameplate before you order. When the old arm is stamped 330426-409, this is the current Carrier assembly for it.

Here is how the part works. A blower motor is a vibrating mass, and bolting it to bare sheet metal would send every bit of that motion into the cabinet and the ductwork. The arm is the structural link that holds the motor position and shaft alignment relative to the blower wheel, and the rubber grommet is the isolator that lets the motor float slightly instead of hammering the metal. As the rubber ages it hardens, cracks, flattens or soaks up oil, the motor sags, and you hear a hum, buzz, tick or rattle that gets worse at high speed. A bent arm or cracked weld or bend can let the motor drift out of line with the wheel, which loads the motor bearings and can bring on wheel rub. Look over the arm and grommet before you condemn the motor. To change it, shut off power at the disconnect, support the motor so it cannot drop, note the arm orientation and grommet position, fit the new assembly, snug the hardware without crushing the rubber, spin the wheel by hand to confirm it runs square and centered, then restore power and check the motor for smooth, quiet operation and normal amp draw.

Key Benefits

• Pre-assembled grommet: The rubber isolation grommet comes seated in the arm, which saves bench time and keeps the vibration-damping geometry the way Carrier built it.
• Genuine Carrier number: 330426-409 is the OEM part number, so there is no bending, drilling or field fabrication, and no guessing between look-alike 330426 dash numbers.
• Quieter operation: A fresh vibration-isolating grommet stops the blower motor from rattling against the cabinet and cuts structure-borne noise in the duct system.
• Protects the blower: Holding the motor in its factory position keeps the shaft aligned with the blower wheel and reduces bearing wear and wheel wobble.

Common Questions

What does the 330426-409 do?
It is the motor mounting arm and grommet assembly. The arm supports and positions the blower motor, and the rubber grommet isolates motor vibration from the cabinet so the unit stays quiet.

How is the 330426-409 different from the 330426-406 and 330426-411?
All three are Carrier ARM & GROMMET ASSY numbers in the same 330426 family, but each dash number is a separate part built for different equipment. Match the number stamped on your old arm and confirm it against the model number and serial number on the nameplate rather than swapping dash numbers.

Can I reuse the old grommet?
We recommend replacing the arm and grommet together. Aged rubber hardens and loses its damping, so a new assembly is the right call any time the motor mount is apart.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.