Carrier 330426-403 Arm Assembly

The Carrier 330426-403 Arm and Grommet Assembly is a genuine Carrier motor mounting arm with the rubber vibration-isolating grommet already in place, sold as a single OEM replacement assembly. It sits in the 330426 family alongside the 330426-401, 330426-405, 330426-406, 330426-407 and 330426-408. It is an inexpensive part for the job it does: it locates the blower motor, supports it, and isolates its vibration so the unit runs quietly.

Because the 330426 family is a run of separate dash numbers, the 330426-403 should be matched by the number stamped on the old arm, not by looks. The arm length, bend angle, mounting holes and grommet differ from one dash number to the next, and an arm that is close but not right can leave the motor off-center, cock the shaft against the blower wheel, or place the grommet under uneven load. Confirm the model number and serial number on the equipment nameplate, and when the old arm reads 330426-403, this is the current Carrier part that replaces it.

The grommet is the part that wears out first. Rubber ages in the heat of the blower compartment: it hardens, splits, flattens or gets oil-soaked, and once it stops cushioning, the motor transfers vibration straight into the cabinet as a buzz, chatter or rattle, usually loudest at high speed. A bent arm or fatigued bend does the same damage in a different way by letting the motor sag. When you see blower noise, a motor that has dropped on its mount or a wheel that rubs, inspect the arm and grommet before replacing the motor. For the swap, lock out the power, support the motor, mark the arm position, fit the 330426-403, tighten the hardware without crushing the rubber, turn the wheel by hand to check clearance and then run the unit and listen.

Key Benefits

• Complete assembly: The arm and rubber grommet come together, so you are not hunting for a separate isolator.
• OEM Carrier part number: 330426-403 is the exact number Carrier uses, which removes the guesswork between similar-looking 330426 arms.
• Noise and vibration control: A fresh grommet restores the cushioning that keeps motor vibration out of the cabinet and ductwork.
• Correct motor alignment: A straight, undamaged arm holds the motor shaft square to the blower wheel, protecting the bearings.

Common Questions

What is the Carrier 330426-403?
It is a Carrier ARM & GROMMET ASSY, the motor mounting arm with its rubber grommet installed, used to hold and isolate a blower motor.

How do I know the 330426-403 is the right dash number?
Read the number stamped on the old arm and confirm the model number and serial number on the nameplate. The 330426-401, 330426-405 and 330426-407 are different parts.

What are the signs the arm or grommet has failed?
A buzz, rattle or chatter from the blower, a motor that sits low or crooked, visible cracks or flattening in the rubber and a wheel that rubs are the common ones.

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.