The Ametek Lamb 116392-00 is the two-stage, 5.7-inch tangential bypass motor most often bought as the replacement vacuum motor for portable carpet extractors - it is the documented service motor for Cobra extractors and turns up in Pacific and Tennant equipment as well. On 120 volts it draws 8.6 amps for 916 watts, moving 97 CFM at 82 inches of sealed lift for 248 air watts. It supersedes the earlier 116392-01.
Built for these use cases
- Portable carpet extractor vacuum motor replacement, including Cobra extractors
- Wet recovery on autoscrubbers and wet/dry commercial machines
- Two-stage 120-volt central vacuum power units
- Compact commercial machines where exhaust must exit one side
- Cleaning contractors keeping a spare extractor motor on the truck
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.
For an extractor this specification is well matched: 82 inches of sealed lift is enough to pull solution out of carpet pile through a wand and hose, while 97 CFM keeps the recovery moving without demanding more than a standard 120-volt circuit can supply at 8.6 amps. That current figure matters on a job site, where an extractor often shares a circuit with a heater or a second machine.
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: 116392-00 (replaces 116392-01)
- Frame diameter: 5.7 inches
- Blower stages: 2
- Cooling: Bypass
- Discharge: Tangential
- Voltage: 120 V
- Current: 8.6 A
- Power input: 916 W
- Airflow: 97 CFM
- Sealed vacuum: 82 inches of water
- Air watts: 248
- Overall height: Approximately 6-1/3 inches
Frequently asked questions
Is this the correct motor for a Cobra extractor?
The 116392-00 is documented as the two-stage vacuum motor used in Cobra extractors, and it also appears in Pacific and Tennant equipment. Confirm the part number on the motor you are removing before ordering.
Does the 116392-00 replace the 116392-01?
Yes. The -00 supersedes the earlier -01 and is what is currently supplied.
Can this motor pick up water?
Yes. It is a bypass motor, which is the configuration extractors and wet recovery machines are designed around, because cooling air never touches the recovered solution.
Will 8.6 amps trip a standard circuit?
On its own, no - a 15 or 20 amp circuit handles it. The problem on job sites is sharing a circuit with a heater or a second machine, so plan your outlets before you plug in.
What does 248 air watts tell me?
It is airflow and sealed lift combined into one number, which makes it the fairest way to compare this motor against another candidate for the same machine.
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.
