The Ametek Lamb 119400 is a single-stage 5.7-inch thru-flow vacuum motor for 120-volt equipment, and quiet is the point. Thru-flow motors cool themselves on the vacuumed airstream instead of a separate cooling fan, which removes a noise source and simplifies the housing. That makes this the motor of choice for dry-pickup machines used around people: hotel and office canisters, upright and stick vacuums, hand dryers and small blowers where 214 air watts is plenty and 28,710 RPM does the work.
Use cases
- Dry-pickup commercial canister and upright vacuums used in occupied buildings.
- Compact and portable vacuums where a smaller, lighter motor matters more than raw lift.
- Blowers, dryers and air-moving equipment built on a 5.7-inch single-stage frame.
- OEM builds that need a quieter motor than a bypass design allows.
Specifications
- Ametek Lamb part number 119400, catalogued as 119400-00
- Single stage, single speed
- 5.7-inch (145 mm) diameter
- 120 volts AC
- Thru-flow discharge
- 7.5 amps full load
- 28,710 RPM nameplate speed
- Maximum output 214 air watts
- Sealed vacuum rating 69.4 inches of water
- Thermoset mounting brackets
- Intermittent duty
- Ball bearing construction
Choosing and fitting
The one rule that governs every thru-flow motor: the air it pulls goes over the motor, so it must be clean, dry and filtered. Fitting a thru-flow motor to a wet recovery machine, or running one behind a torn or clogged filter, is the fastest way to shorten its life. If your machine handles moisture, you want a bypass motor instead. Otherwise confirm the 5.7-inch diameter, the bracket style and the bolt pattern against the motor you are removing, and check that 7.5 amps suits the machine's switch and cord.
Frequently asked questions
What is the difference between thru-flow and bypass?
A thru-flow motor cools itself with the same air it vacuums, so it needs clean, dry, filtered air but runs quieter and costs less. A bypass motor has a separate cooling path and tolerates moisture and dust, which is why wet/dry machines use it. Never substitute one type for the other without checking the machine's design.
Can I use the 119400 for wet pickup?
No. Water drawn through a thru-flow motor reaches the windings and bearings directly. For any wet or damp recovery, choose a bypass motor sized for your machine.
Is 214 air watts enough?
For dry pickup in a single-stage machine, yes; that is the class this motor competes in. If you need to hold suction through long hose runs or heavy debris, step up to a two-stage or three-stage bypass motor rather than expecting more from a single-stage frame.
Why is my machine louder after a motor change?
Usually because a bypass motor went in where a thru-flow motor came out, or because the mounting gasket and vibration isolators were reused. Fit the correct motor type and use fresh gaskets and isolators; both are cheap and both are what keep the machine quiet.
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.
