Carrier 330426-407 Arm Assembly

Q: What is the Carrier 330426-407?

It is a Carrier ARM & GROM ASSY, a motor mounting arm with a black rubber grommet, used to support a blower motor and isolate its vibration.

Q: How do I tell the 330426-407 from the 330426-405?

The 330426-407 is a shallow-bend arm with a black grommet; the 330426-405 is a right-angle arm with a tan grommet. Always confirm the number stamped on the old arm and the nameplate model and serial number.

Q: Why does a blower get noisy when the grommet wears?

Worn rubber stops absorbing vibration, so the motor transmits it into the cabinet as buzzing or rattling. A new arm and grommet assembly restores the cushion.

Carrier

$10.74

The Carrier 330426-407 Arm and Grommet Assembly is the OEM motor mounting arm with a black rubber grommet already installed. The arm is a zinc-colored metal bracket with a shallow bend, and it comes with the grommet fitted as a complete Carrier factory assembly. It sits in the 330426 family, the same family as the 330426-401, 330426-403, 330426-405, 330426-406, 330426-408 and 330426-409.

The shallow bend and the black grommet are the visual cues for this dash number. The 330426-405 is a right-angle arm with a tan grommet, so a quick look at the shape and the rubber color is a good first check. It is only a first check, though. Each dash number in the 330426 family is a separate part, and the only reliable match is the number stamped on the old arm together with the model number and serial number from the equipment nameplate. When the old arm reads 330426-407, this is the current Carrier assembly for it.

The reason this small part gets attention is the job it does. A running blower motor vibrates, and the arm holds it at the exact position and shaft alignment to the blower wheel while the grommet isolates that vibration from the sheet metal. With age the rubber goes hard, brittle, flat or oily, the motor loses its cushion and the unit starts to hum, buzz, tick or rattle, often most at high speed. A bent arm or a cracked bend will let the motor sag, load the bearings and cause wheel rub. If the blower is noisy, check the arm and grommet before you replace the motor. To replace it, lock out the power, support the motor, record the arm orientation, fit the 330426-407, tighten the fasteners without crushing the rubber, turn the wheel by hand and run the unit to confirm smooth, quiet operation.

Key Benefits

Shallow-bend arm, black grommet: The 330426-407 has a distinct look that makes it easy to verify against the old part.
OEM Carrier assembly: It is the genuine Carrier part number, supplied with the grommet already fitted.
Less blower noise: A new isolation grommet stops motor vibration from traveling into the cabinet and ductwork.
Better motor support: A straight arm holds the motor where Carrier intended and keeps the shaft aligned to the wheel.

Common Questions

What is the Carrier 330426-407?
It is a Carrier ARM & GROM ASSY, a motor mounting arm with a black rubber grommet, used to support a blower motor and isolate its vibration.

How do I tell the 330426-407 from the 330426-405?
The 330426-407 is a shallow-bend arm with a black grommet; the 330426-405 is a right-angle arm with a tan grommet. Always confirm the number stamped on the old arm and the nameplate model and serial number.

Why does a blower get noisy when the grommet wears?
Worn rubber stops absorbing vibration, so the motor transmits it into the cabinet as buzzing or rattling. A new arm and grommet assembly restores the cushion.

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.