The Ametek Lamb 116471-00 is among the strongest 120-volt motors in the 5.7-inch family: 112 CFM of airflow, 106.7 inches of sealed lift and 404 air watts, drawing 10.7 amps. It is a two-stage peripheral bypass motor, which makes it the standard replacement in central vacuum power units and industrial machines that need serious suction at the end of a long duct run - and, because it is a bypass motor, one that can be specified for wet recovery as well.
Built for these use cases
- Central vacuum power unit motor replacement on 120-volt systems
- Industrial and commercial vacuums needing high sealed lift
- Wet recovery machines where bypass construction is required
- Long duct or long hose runs where lift matters more than raw airflow
- OEM and depot service replacement across the 116471 family
A bypass motor carries a separate cooling fan, so the air that cools the armature and field never mixes with the air being pulled through the machine. That separation is the whole reason bypass motors are specified for wet recovery work such as carpet extraction and autoscrubber recovery, where the airstream is carrying water, foam and cleaning solution. It also means the motor is not being cooled by whatever the operator happens to be picking up.
Peripheral discharge exhausts cooling air around the full circumference of the motor housing rather than through a single port. In a canister or power unit that has room around the motor, peripheral discharge keeps exhaust noise diffuse and simplifies the mounting, which is why it shows up so often in central vacuum power units.
At 404 air watts this motor is doing real work, and the 10.7 amp draw reflects it. On a 15-amp circuit that is close to comfortable capacity for continuous running, which is one reason central vacuum installers generally give a power unit its own circuit. If you are replacing a lower-output motor with this one, confirm the machine's wiring and switchgear are rated for the higher current before you fit it.
Carbon brushes are the wear part on any Ametek Lamb motor, not the motor itself. Ametek's own guidance is that a set of brushes can be changed twice before the armature and other components need replacing, with roughly 60 percent of original life available after the first change and about 40 percent after the second. Technicians on contractor and facility forums put a working motor's service life in the 800 to 900 hour range and describe a fresh brush set adding several hundred more hours to a motor that had started cutting in and out. If a machine has begun surging, losing suction intermittently, or throwing sparks at the commutator, brushes are the first thing to check.
Specifications
- Manufacturer part number: 116471-00
- Frame diameter: 5.7 inches
- Blower stages: 2
- Cooling: Bypass
- Discharge: Peripheral
- Voltage: 110 to 120 V
- Current: 10.7 A
- Airflow: 112 CFM
- Sealed vacuum: 106.7 inches of water
- Air watts: 404
- Height: Approximately 6.75 inches
Frequently asked questions
What makes 404 air watts significant?
Air watts combine airflow and sealed lift into one figure. At 404 this is toward the top of the two-stage 5.7-inch 120-volt range, which is why it is specified for central vacuum systems with long duct runs.
Can this motor be used on wet pickup?
Yes. Bypass construction keeps cooling air entirely separate from the recovery airstream, which is the requirement for extractors and wet recovery machines.
Does 10.7 amps need a dedicated circuit?
For continuous running it is sensible. Central vacuum power units are usually given their own circuit, and if you are upgrading from a lower-draw motor you should confirm the existing wiring and switch are rated for it.
What is peripheral discharge?
Cooling air exhausts around the circumference of the housing rather than out one side port. It suits power units and canisters with open space around the motor.
The motor keeps cutting in and out. What is wrong?
Almost always worn carbon brushes losing consistent contact with the commutator. A new brush set is inexpensive and can return several hundred hours of service.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks the matching carbon brush kits, gaskets and mounting hardware alongside them. Our US-based team works with these motors every day across central vacuum systems, extractors, autoscrubbers and shop equipment, and can help you confirm frame size, stage count, discharge style and voltage against the motor already in your machine before you order.