The Ametek Lamb 117549 is a two-stage 7.2-inch tangential bypass motor for 120-volt equipment, and it is the one to reach for when a machine needs airflow and lift in equal measure. Published performance runs to about 125 inches of water lift with 114.8 CFM for 484 air watts, drawing roughly 13.5 amps. Aluminum fan-end and commutator brackets and a 10 mm shaft make it a durable choice for commercial and central vacuum service rather than a lightweight consumer part.
Use cases
- Central vacuum power units that have lost suction at the furthest inlets.
- Commercial and industrial canister vacuums in daily janitorial service.
- Wet/dry recovery machines where bypass cooling keeps moisture away from the windings.
- OEM and repair builds that need high air watts from a two-stage 7.2-inch frame.
Specifications
- Ametek Lamb part number 117549, catalogued as 117549-12
- Two stage, single speed
- 7.2-inch (183 mm) diameter
- 120 volts, 50/60 Hz
- Approximately 13.5 amps nominal draw
- Tangential bypass discharge
- Double ball bearings, 10 mm shaft
- Sealed vacuum up to about 135 inches of water; 125.4 inches at the published rating point
- Airflow up to about 125 CFM; 114.8 CFM at the published rating point
- 484 air watts at 1675 watts input
- Aluminum fan-end and commutator brackets
- Epoxy-painted fan case, non-loading fans
- Provision for grounding
- UL recognized, category PRGY2 (E47185); CSA certified, class 1611 01 (LR31393)
Choosing and fitting
Two published figures circulate for this motor: a peak set near 135 inches of lift and 125 CFM, and a rating-point set of 125.4 inches and 114.8 CFM at 1675 watts. Both describe the same motor at different places on its curve, which is worth knowing when you compare it against another brand's headline number. At about 13.5 amps it is a substantial load, so confirm the machine's wiring and circuit before stepping up to it. Check diameter, height, bracket style and bolt pattern, and fit a new mounting gasket.
Frequently asked questions
Is 117549 the same as 117549-12?
Yes. 117549-12 is the full Ametek catalogue number; 117549 is the short form used across the trade. Both refer to the same two-stage 7.2-inch 120-volt bypass motor.
Why do different sellers list different specifications?
Because they quote different points on the same performance curve. Peak sealed vacuum and peak airflow never occur at the same moment, so a listing showing 135 inches of lift and one showing 125.4 inches can both be accurate. Compare motors at the same point on the curve, or compare air watts.
Will it handle wet pickup?
Bypass construction keeps cooling air out of the recovered airstream, which is the reason this style of motor is used in wet/dry machines. Wet capability still depends on the machine having a working float shutoff and recovery tank, so follow the equipment maker's guidance.
Are the aluminum brackets worth paying for?
In commercial service, yes. Aluminum fan-end and commutator brackets shed heat better and tolerate vibration and rough handling better than thermoset plastic, which matters on machines that get moved, dropped and run hard every day.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks the brushes, gaskets and service parts that go with them. Our US-based team can help you match a replacement motor to the machine you already own.
