Ametek Lamb 114787 Three Stage 7.5-inch Bypass Vacuum Motor - 120V
When a central vacuum, a commercial canister or a car wash vacuum stops pulling, the motor is usually the end of the line - and a three stage Ametek Lamb is what most of those machines were built around in the first place. The 114787 is the 7.5-inch, 120 volt, three stage bypass motor with peripheral discharge, and it is the workhorse OEM builders specify when a machine has to pull hard, all day, for years. Equipment dealers, central vacuum installers and car wash operators buy it to bring a good machine back rather than replace a whole unit.
Bypass construction is the reason it survives that duty. The cooling air path is separate from the work air path, so the motor is not being cooled by the dirty, wet or abrasive air it is moving - which is exactly why bypass motors go into car wash and material handling service where a through-flow motor would not last. Double ball bearings and a rated life of up to 1,000 hours back that up.
Built for these use cases
This motor is specified where suction and duty cycle both matter more than size or noise.
- Rebuilding commercial canister and utility vacuums that have lost suction to a failed motor
- Replacing the power unit motor in a residential or light commercial central vacuum system
- Servicing self-serve car wash vacuum stations that run continuously in wet, abrasive conditions
- Powering material handling and transfer systems that move product by vacuum
- OEM and equipment dealer stock for machines built around a 7.5-inch three stage Lamb motor
Specifications
- Configuration: three stage, bypass, peripheral discharge
- Diameter: 7.5 inches (191 mm)
- Voltage: 120V AC, 50/60 Hz, single speed
- Current: up to 11.3 amps maximum
- Power: approximately 1,150 watts
- Speed: approximately 14,620 RPM
- Sealed vacuum: approximately 88.1 inches of water lift
- Maximum airflow: approximately 126.4 CFM; approximately 359 max air watts
- Bearings: double ball bearings; aluminum fan end and commutator brackets
- Rated life: up to approximately 1,000 hours
- UL recognized, category PRGY2 (E47185), with provision for grounding
- Ametek Lamb part number 114787
Frequently asked questions
What is the difference between a bypass motor and a through-flow motor?
On a bypass motor the cooling air is drawn through a separate path from the work air, so the motor is never cooled by the dirt, moisture or debris it is moving. That is why bypass motors are specified for wet pickup, car wash and material handling duty where a through-flow motor would fail early.
How much suction does the 114787 produce?
It is rated at roughly 88.1 inches of sealed water lift with maximum airflow around 126.4 CFM and about 359 max air watts, driven by roughly 1,150 watts of input at 120 volts.
What does three stage mean and why does it matter?
Three stage refers to three fan sets in series. Each stage adds sealed suction, so a three stage motor pulls much harder at depth than a single or two stage unit - which is what long hose runs on a central vacuum or a car wash station demand.
How long should this motor last?
Ametek rates the design at up to approximately 1,000 hours of service life. Real-world life depends heavily on duty cycle, filter maintenance and whether the machine is being run with restricted airflow.
Will it fit my machine?
It is the standard 7.5-inch three stage bypass peripheral discharge form factor with the Ametek Lamb 114787 part number. Measure your existing motor diameter, confirm the discharge style and voltage, and match the part number stamped on the old motor before ordering.
Discount Cleaning Products is an authorized dealer stocking Ametek Lamb vacuum motors alongside a deep catalog of commercial vacuum, floor care and restoration parts. Orders ship from US warehouses and our US-based support team can help you confirm fitment against your model and serial number before you buy, so you get the right part the first time.
