The Ametek Lamb 115334 is the replacement motor most central vacuum and commercial canister owners reach for when a 7.2-inch, 120-volt power unit finally gives up. It is a two-stage tangential bypass motor, which means the dirty working air never touches the armature or the windings; a separate cooling fan pulls its own clean air through the motor. That is why this family of motor survives in machines that see damp debris, fine construction dust and long duty cycles, and it is why a service tech can drop one into a power unit that would otherwise be scrapped. At two stages the fan set trades a little airflow for sealed lift, so the motor keeps pulling through long runs of pipe, loaded filters and 30 or 40 feet of hose instead of falling away as soon as the system loads up.
Use Cases
- Rebuilds a residential or light-commercial central vacuum power unit whose original 7.2-inch 120V motor has failed
- Restores suction in commercial canister and utility vacuums used for construction cleanup and post-renovation work
- Drives car wash and self-serve vacuum stations that run continuously and wear motors out on a schedule
- Powers material handling, transfer and recovery equipment that needs steady sealed lift rather than peak airflow
- Serves as a stocked spare for facility maintenance shops that cannot afford downtime on a built-in vacuum system
Specifications
- Blower stages: 2
- Body diameter: 7.2 in (183 mm)
- Voltage: 120 V AC, 50/60 Hz
- Motor speed: 17,400 RPM
- Sealed vacuum (water lift): 110 in
- Maximum airflow: 102.7 CFM
- Maximum air watts: 384
- Current draw: 12 amps
- Airflow system: bypass, tangential discharge
- Bearings: double ball bearing
- Overall height: 6 in; bolt height 1.5 in
- Construction: aluminum fan end bracket, aluminum commutator bracket
- Speed: single speed
- Shipping weight: approximately 10.6 lb
Fits
This is one of the most widely used 7.2-inch 120-volt motors in the industry and it appears in central vacuum power units built under many different brand names, so no single machine list is authoritative. The reliable check is physical: match body diameter, stage count, voltage, discharge style and mounting height against the motor you are pulling out. If the old motor is a 7.2-inch two-stage tangential bypass unit on 120 volts, this is the direct replacement.
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Frequently asked questions
Will this motor handle wet pickup?
It is a bypass motor, so the working air is routed away from the windings and the motor is cooled by its own separate air path. That construction is what makes bypass motors the normal choice for wet and damp recovery. It does not by itself make your machine a wet vacuum, so the tank, float shutoff and filtration on the unit still decide what you can safely pick up.
What is the difference between two stages and three stages?
Stages are fan sets stacked on the same shaft. Each added stage raises sealed lift and lowers airflow. A two-stage motor like this one is the balanced choice for central vacuums and canister machines that pull through long pipe runs; a single stage moves more air over a short hose, and three stages are used where lift matters more than volume.
How long should the carbon brushes last?
Average brush life on a 7.2-inch Ametek Lamb motor is around 700 hours of run time. On a household central vacuum that is many years; on a car wash or a commercial machine it can be a single season. Checking the brushes at roughly 500 hours and replacing them before they wear into the commutator is far cheaper than replacing the motor.
How do I know it is the motor and not something else?
Weak suction is usually a clog, a full bag or a split hose before it is a motor. A failing motor normally announces itself with bearing noise, a burning smell, visible arcing at the brushes, or a unit that trips its breaker. Confirm the airway is clear and the filters are clean before you order a motor.
Does the discharge style matter, or can I use a peripheral motor?
It matters for fitment rather than performance. Tangential discharge sends the exhaust out through a tube on the side of the motor; peripheral discharge vents it around the perimeter. The power unit housing is built around one or the other, so ordering the wrong discharge style usually means the exhaust will not line up with the duct.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks replacement motors, carbon brushes and service parts for commercial and central vacuum equipment. Orders are supported by a US-based team that works with these motors every day, so if you are unsure which body diameter, stage count, discharge style or voltage your machine takes, ask before you order.