When a carpet extractor or a large canister vacuum stops recovering water the way it used to, the vacuum motor is usually the reason. The Ametek Lamb 116565 is the three-stage, 5.7-inch, 120-volt bypass motor that powers a wide range of commercial extractors and industrial vacuums, and it is the motor most often specified when a machine needs serious lift through a long hose and a wand.
Three fan stages and double ball bearings are what set this motor apart from the lighter units used in general-purpose vacuums. It is the part a carpet cleaning contractor reaches for when a portable extractor is still mechanically sound but no longer pulls the carpet dry, and the part an equipment shop stocks because so many machines are built around this frame.
Use Cases
- Repowering portable carpet extractors that leave carpet wetter than they should
- Servicing commercial canister and industrial wet/dry vacuums that have lost recovery
- Rebuilding truck-support and box extractors where the vacuum motor has failed but the pump and heater are sound
- Equipment shops carrying a common high-lift service motor for multiple machine brands
- OEM and custom equipment built around the 5.7-inch three-stage Lamb frame
Specifications
The 116565 is a 5.7-inch three-stage bypass motor for 120-volt, 50/60 Hz operation, built with double ball bearings and tangential discharge in an open-fan construction. Published figures for this frame put motor speed in the region of 17,700 RPM with sealed vacuum around 117 inches, maximum airflow near 99 CFM, and a maximum current draw in the region of 10.7 amps. Bypass construction means the cooling air path is separate from the working air path, so the motor is not cooled by the dirty air it is moving.
That bypass design is the reason this motor suits water recovery. Air-sealed bearings add protection against dirt and moisture, but the motor is still specified for clean, dry, filtered air on the working side, and the separation only works if the machine's filtration and float shut-off are intact. Tangential discharge routes the exhaust out the side rather than through the base, which is what dictates the housing it fits, so check the discharge orientation as well as the frame diameter when matching a replacement.
Ametek dash numbers cover meaningful differences. Variants of the 116565 differ in lead length, horn or fan-end bracket style, and mounting detail, so read the label on the existing motor and match the full number before ordering. On a machine that has been run hard, replace the intake filter at the same time and check the recovery tank float. A motor that has ingested water once will usually do it again if the shut-off is sticking, and a fresh motor will not survive that treatment any longer than the old one did.
Frequently asked questions
What are the main specifications of the 116565?
It is a 5.7-inch three-stage bypass motor for 120-volt operation with double ball bearings and tangential discharge. Published figures for this frame are around 17,700 RPM, roughly 117 inches of sealed vacuum, about 99 CFM maximum airflow, and a maximum draw near 10.7 amps.
What does bypass construction mean and why does it matter?
Bypass means the motor's cooling air path is separate from the working air path, so the motor is not cooled by the dirty or wet air it is moving. That separation is what makes the motor suitable for water recovery work.
Will this motor fit my extractor?
Match the full part number on the existing motor along with the frame diameter, the number of stages, the voltage, the discharge orientation and the mounting detail. Tangential discharge motors are not interchangeable with peripheral discharge units.
Why did my last vacuum motor fail?
On extractors the usual causes are a sticking recovery tank float that lets water reach the motor, or a clogged or missing intake filter. Check both before fitting a replacement.
Is a three-stage motor better than a two-stage motor?
Three stages produce more sealed lift, which helps when pulling through a long hose and wand. A two-stage motor may be the correct specification for a smaller machine, so match what the equipment was built with.
Discount Cleaning Products is an authorized dealer for the brands we carry, with US-based product support from people who know this equipment. If you are unsure whether this part matches the machine you are servicing, contact us with the model and serial number and we will confirm the fitment before you order.
