Carrier 330426-401 Mounting Arm

The Carrier 330426-401 Mounting Arm and Grommet Assembly is the OEM motor mounting arm with its rubber grommet already fitted, supplied as one factory replacement assembly from Carrier. It sits in the 330426 arm family, which also includes the 330426-403, 330426-405, 330426-406, 330426-407, 330426-409 and 330426-411 assemblies. The 330426-401 is a small HVAC blower motor mounting part, but it is the piece that holds the motor in position and keeps motor vibration from reaching the cabinet.

Every dash number in the 330426 family is its own part. The 330426-401 is not interchangeable with the 330426-403, the 330426-405 or the 330426-407 just because the arms look close; the arm shape, bend, bolt pattern and grommet are built for particular equipment. Read the number stamped on the old arm and confirm the full model number and serial number from the unit nameplate before you order. When the old arm is marked 330426-401, this is the current Carrier assembly for it.

Here is why the pair matters. A blower motor is a vibrating mass, and bolting it straight to sheet metal would carry that vibration into the cabinet and the ductwork. The arm is the structural link that sets motor position and shaft alignment to the blower wheel, and the rubber grommet is the isolator that lets the motor sit without hammering the metal. As rubber ages it hardens, cracks, flattens or soaks up oil, the motor sags, and you get a hum, buzz, tick or rattle that is worse at high speed. A bent or cracked arm can let the motor drift out of line, which loads the motor bearings and can cause wheel rub. Check 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, then restore power and listen for smooth, quiet operation.

Key Benefits

• Grommet already installed: The rubber isolation grommet comes seated in the arm, saving bench time and keeping the vibration-damping geometry the way Carrier built it.
• Genuine Carrier number: 330426-401 is the OEM part number, so there is no bending, drilling or field fabrication.
• Quieter blower: A fresh vibration-isolating grommet stops the motor from buzzing against the cabinet and quiets the duct system.
• Protects the motor and wheel: Holding the motor in its factory position keeps the shaft aligned with the blower wheel and reduces bearing wear.

Common Questions

What does the 330426-401 do?
It is the motor mounting arm and grommet assembly. The arm supports and positions the blower motor and the rubber grommet isolates its vibration from the cabinet.

Can I substitute a different 330426 dash number?
No. The 330426-401 is a separate part from the 330426-403, 330426-405, 330426-407 and the rest of the family. Match the number stamped on the old arm and verify against the nameplate model and serial number.

Should I replace the grommet separately?
Replace the arm and grommet together. Aged rubber 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.