The Ametek Lamb 117488 is a two-stage 7.2-inch tangential bypass motor for 120-volt equipment, and it is the one with the reverse-flow cooling fan. That single detail decides whether it is right for your machine: the cooling air path runs the opposite way to the standard build, so the motor is specified for equipment that handles clean, dry, filtered air only. Where a machine was designed around it, it is a strong, long-running motor that spins to 23,613 RPM on a standard 120-volt circuit.
Use cases
- Direct replacement in machines whose parts list specifies the reverse-flow cooling variant.
- Dry-only commercial canister, utility and central vacuum units.
- Material handling, transfer and dust-collection equipment running filtered air.
- OEM builds where the housing directs cooling air in the reverse direction.
Specifications
- Ametek Lamb part number 117488, catalogued as 117488-13
- Two stage, single speed
- 7.2-inch (183 mm) fan diameter
- 120 volts AC, 50/60 Hz, series universal motor
- Bypass fan system with tangential air discharge
- Reverse-flow cooling fan
- 23,613 RPM
- Double ball bearing system with air seal
- Skeleton frame; thermoset fan-end and commutator brackets
- Epoxy fan shell coating
- Carbon brushes, lead wire connections, no RFI choke, no thermal protector
- Class A insulation, intermittent duty
- Operating temperature 32 to 104 F
- Shipping weight approximately 10.1 pounds
- UL recognized and CSA certified
Choosing and fitting
Read the note on cooling before anything else. Because the cooling fan flow is reversed, this motor is rated for clean, dry, filtered air; it is not the part to fit to a wet recovery machine or to a unit with a failed filter. There is also no thermal protector built in, so the machine's own overload protection matters. Confirm the number on the motor casting, the 7.2-inch diameter, the bracket material and the bolt pattern before ordering, and replace the mounting gasket at the same time.
Frequently asked questions
What does the reverse-flow cooling fan change?
It reverses the direction cooling air travels through the motor compared with the standard build. Machines are designed around one or the other, so fitting the wrong one leaves the motor running hotter than intended. If the parts list or the old motor says 117488, this is the correct part.
Can I use it for wet pickup?
No. Ametek specifies this motor for clean, dry, filtered air only. For wet or damp recovery choose a standard-flow bypass motor sized for your machine.
Does it include a thermal protector?
No. This build ships without a thermal protector and without an RFI choke. The equipment it is fitted into is expected to provide overload protection, so do not bypass the machine's own circuit protection.
Are the brackets metal?
The fan-end and commutator brackets are thermoset plastic rather than aluminum on this build, and the frame is a skeleton type. If your machine's mount was designed for an aluminum-bracket motor, check the fit before you order.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks the brushes, gaskets and service parts that go with them. Our US-based team can help you match a replacement motor to the machine you already own.
