The Ametek Lamb 116565-13 is the three-stage, 5.7-inch tangential bypass motor specified when a 120-volt machine has to hold vacuum against a long hose or a restrictive tool. It is bought by autoscrubber and extractor technicians, car wash operators and commercial vacuum service shops as a direct replacement, and it is one of the more widely cross-referenced motors in the Lamb line because several equipment makers built machines around it.
Built for
- Autoscrubber and floor machine vacuum recovery on 120-volt service
- Commercial canister and utility vacuums with a long hose run
- Carpet extractors and wet recovery machines
- Car wash vacuum stations on mains power
- Sprayers, foggers and material transfer systems moving clean, dry air
How this motor works
Stage count is the trade-off that decides which motor belongs in a machine. Each additional fan stage buys sealed lift and costs airflow. A single-stage motor moves the most air and is right behind a short hose; a two-stage motor is the general-purpose choice; a three-stage motor is what you want when the hose run is long or the tool is restrictive and the machine has to hold vacuum against that restriction.
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.
Tangential discharge routes cooling air out through a single side port, which lets the machine builder aim the exhaust deliberately, into a muffler, a sound baffle, or straight out of the cabinet. On extractors and compact commercial machines where the motor sits in a tight enclosure, that directed exhaust is often the difference between a motor that runs cool and one that heat-soaks.
At 117 inches of sealed lift and 99 CFM the balance here is clearly toward lift. That is the right trade when the restriction is downstream of the motor, a long hose, a narrow crevice tool, a full filter bag, and the wrong trade when the machine's job is moving high volumes of air over a short path.
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 the rest of the assembly need replacing, with roughly 60 percent of original life left after the first change and about 40 percent after the second. If a machine has begun surging, losing suction intermittently, or throwing sparks at the commutator, brushes are the first thing to check before condemning the motor.
The one symptom that is not a brush job is a burning smell. Technicians on carpet-cleaning and contractor forums are consistent about this: a scorched odor means the armature has overheated where the brushes ride, and the machine should be shut down at once rather than run to the end of the job. A motor that has cooked its armature is a replacement, not a repair.
Ametek Lamb part numbers are not interchangeable by diameter alone. Before ordering, pull the old motor and match four things: frame diameter, number of fan stages, discharge configuration and nameplate voltage. Two motors that share a body size can have completely different gasket surfaces, lead lengths and airflow paths, and a mismatch usually shows up as a motor that physically drops in but never reaches its rated suction.
Specifications
- Fan diameter: 5.7 in
- Stages: 3
- Airflow system: bypass
- Air discharge: tangential
- Voltage: 120 V
- Maximum amps: 10.7 A
- Maximum air watts: 368
- Sealed vacuum (water lift): 117 in
- Maximum airflow: 99 CFM
- Speed: 17,700 RPM
- Bearings: double ball bearing, permanently lubricated
- Enclosure: open
- Mounting: all-position
- Maximum ambient: 40 degrees C
- Duty: intermittent
- Replacement brush: L-33384
- Air handled: clean, dry, filtered air only
Fitment
Distributors publish this exact part number against several equipment-maker numbers, including Advance 56209095, Tennant 130416 and Tornado 19118. Those are distributor cross-references rather than a manufacturer compatibility table, so verify against your machine's parts list. Because the suffix here is -13, those references apply to this build specifically and not to other 116565 variants.
Frequently asked questions
What carbon brush does 116565-13 use?
The published brush number for this motor is L-33384. Brushes are the wear part and are usually what needs changing when a motor starts surging or sparking.
Which machines is it cross-referenced to?
Distributor listings cross-reference it to Advance 56209095, Tennant 130416 and Tornado 19118, among others. Verify against your machine's own parts list before ordering.
Why choose three stages over two?
Three stages hold more sealed lift and move less air. That is what you want behind a long hose or a restrictive tool; a two-stage motor is the better choice for high airflow over a short path.
Can it be mounted in any orientation?
Yes. It is rated for all-position mounting, with an open enclosure and a 40 degree C maximum ambient, on intermittent duty.
Is it suitable for picking up water?
It is a bypass design, which is what wet recovery machines use, but the motor itself is rated for clean, dry, filtered air. The machine's float shut-off and filtration are what keep water off the windings.
Discount Cleaning Products is a United States based dealer for Ametek Lamb vacuum motors and stocks the matching carbon brush kits, gaskets and mounting hardware alongside them. Our 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.
