Vacuum Motors by Ametek Lamb

The Industry Standard for Car Wash Vacuum Performance

For decades, Ametek Lamb has been the most trusted name in commercial and industrial vacuum motors. When operators need a replacement motor that will survive the harsh, high-use environment of a busy car wash, they turn to Ametek. These motors are engineered for heavy continuous use, providing the airflow (CFM) and deep suction (water lift) required to remove embedded dirt, water, and debris from vehicle carpets and upholstery.

Using an authentic Ametek Lamb vacuum motor ensures compatibility, longevity, effective suction power, and reliable performance. Will a generic motor fit your system? Most likely, as long as the specs match. Will it last as long under the daily strain of hundreds of customers typically experienced at car washes? Probably not.

Ametek motors feature a robust construction, heavy-duty carbon brushes, innovative seals to protect suction power, and precision-balanced fans that significantly reduce vibration and overheating. Whether you are servicing a detailing extractor, maintaining a car wash central vacuum system, or operating a row of coin-operated self-serve vacuums, installing an Ametek motor helps maximize uptime and protects your investment thanks to Ametek's proven reliability!

Understanding Ametek Lamb Vacuum Motor Types

For optimal performance and to ensure the safety of your equipment, selecting the correct vacuum motor type for your specific application is crucial. Ametek manufactures several distinct motor configurations. Understanding the differences will help you make the right purchasing decision. Always replace a vacuum motor with the same type as the original model or follow the manufacturer's recommendations to ensure compatibility.

Thru-Flow Vacuum Motors:

In a thru-flow motor, the working air, the air being vacuumed up, travels directly through the motor system, cooling the windings as it passes over them. These motors are highly efficient and often more compact, making them ideal for dry central vacuum systems and standard commercial vacuums. However, they should never be used in wet applications. If moisture, foam, or chemicals pass through a thru-flow motor, it will cause an immediate electrical short and destroy the motor.

Peripheral Bypass Motors:

Bypass motors separate the working air from the cooling air. A completely independent fan draws in clean, outside air to cool the motor's electrical components, while the vacuum fans handle the dirty working air. In a peripheral discharge bypass motor, the exhausted vacuum air vents out evenly around the perimeter of the motor housing. These are incredibly common in car wash applications because the bypass design protects the motor from moisture and dirt. They are the go-to choice for wet/dry vacuums and standard self-serve car wash vacs.

Tangential Bypass Motors:

Tangential bypass motors take the protection of a bypass system one step further. Instead of venting exhaust air around the perimeter of the housing, the air is forced out through a single, horn-shaped exhaust pipe (the tangent). This allows you to attach a hose to the exhaust and route the damp, dirty air completely outside of the vacuum housing, workspace, or building where the vacuum is used. For heavy-duty car wash central vacuum systems, tangential bypass motors deliver the highest level of protection and durability.

Key Specifications to Consider When Buying

Selecting the exact Ametek vacuum cleaner motor requires matching several key specifications from your old unit. Always check the data plate on your existing motor, consult your vacuum's manual, or reach out to the manufacturer to confirm these details. We can leverage our direct relationships with vacuum manufacturers to help you find the exact specifications of your original motor or recommend compatible replacement motors when needed.

Fan Stages:

The "stage" of a motor refers to the number of fan blades (impellers) stacked inside the unit. As the number of fan blades increases, the air flow decreases.

• 1-Stage Motors: Feature a single fan. They produce massive airflow (CFM) but lower suction (water lift). These are generally used for moving light, dry debris.
• 2-Stage Motors: Feature two stacked fans. This is the most common configuration in the car wash industry. A 2-stage Ametek motor provides an excellent balance of high CFM for moving debris and strong water lift for pulling dirt out of carpets.
• 3-Stage Motors: Feature three stacked fans. These motors generate immense suction power (water lift) at the expense of some airflow. They are ideal for central vacuum systems where overcoming hose restriction is necessary.

Voltage:

Motors are strictly rated for specific voltages. Most standard car wash canister vacuums and detailing extractors utilize standard 120 Volt configurations. However, large multi-drop central vacuum systems often run on 240 Volt power to handle the increased electrical load efficiently. Installing a motor with the wrong voltage will result in immediate failure that can be dangerous or lead to low performance.

Motor Amps:

Motor amps indicate the total electrical current used by the vacuum motor during operation. Checking amps helps compare motor efficiency and ensures compatibility with your power requirements. High or fluctuating amp draw can signal motor wear or installation issues. Always confirm motor amp ratings to prevent overloads and extend the lifespan of the motor and other electrical components of your vacuum.

Diameter (Footprint):

Ametek Lamb vacuum motors come in several standardized diameters, most commonly 5.7-inch and 7.2-inch models. The physical dimensions dictate whether the motor will fit securely inside your vacuum housing. A 7.2-inch motor will not fit a housing built for a 5.7-inch unit, and a smaller motor will not seal properly in a large housing, leading to massive suction leaks. Always match the diameter precisely to the original.

Cubic Feet per Minute (CFM):

Cubic Feet per Minute (CFM) measures a vacuum motor’s airflow. Higher CFM means more air movement for efficient cleaning and debris removal, helping you evaluate performance.

Horsepower:

Horsepower measures a vacuum motor’s power output, directly impacting suction and cleaning performance. Choosing the right horsepower ensures optimal results and reduces downtime for your car wash operation.

RPM (Speed):

RPM refers to the revolutions per minute of a vacuum motor, indicating how fast it spins. Higher RPM usually means greater airflow and suction, impacting cleaning performance.

Airflow Rating (CFM):

Airflow Rating, also labeled cubic feet per minute (CFM), indicates the motor’s airflow capacity. Use this spec to compare vacuum motor performance and ensure proper fit for your system’s needs.

Water Lift (Sealed Suction):

Water lift measures a vacuum motor’s ability to lift a 1'' column of water vertically, showing its suction strength. This test simulates the process of lifting dirt and debris from carpets. Higher water lift means stronger suction for heavy debris or wet pickup.

Common Applications in the Car Wash Industry

Ametek Lamb motors power a massive variety of equipment across the professional car cleaning industry. You can typically find these motors in self-serve vacuum islands, exoress wash central vacuum systems, and detail extractors.

Self-Serve Vacuum Islands: The classic coin-operated vacuums sitting on your lot are almost certainly powered by 2-stage or 3-stage peripheral bypass motors. Because customers vacuum up snow, slush, and wet debris, the bypass configuration is essential for keeping these profitable machines running week after week.

Central Vacuum Systems: Express tunnels and tunnel washes often use massive central vacuum systems with producers connected to long runs of PVC piping. These systems require large, high-voltage Ametek Lamb motors, often running multiple motors in tandem to deliver adequate suction across ten or twenty different hose drops simultaneously.

Auto Detailing Extractors: Professional detailers rely on hot water carpet extractors to remove deep stains. These machines use high-performance tangential bypass motors to lift water out of the upholstery while routing damp exhaust air away from internal components and electronics.

Signs It's Time for a Replacement Motor

Vacuum motors are wear items. Even the best Ametek lamb electric vacuum motor will eventually require replacement after thousands of hours of commercial use. How do you know if your vacuum motor is bad? Watch for these common symptoms:

• Significant Loss of Suction: If you have checked common causes of suction loss and hoses are not leaking and clog-free, your filter bags are clean, and the gaskets are in good condition, but the machine barely picks up dirt, the internal fans or bearings may be failing.
• Excessive Noise or High-Pitched Squealing: A healthy motor produces a loud but smooth rushing sound. Squealing, grinding, or rattling indicates that the ball bearings are destroyed or an impeller fan has shattered.
• Burning Smell or Smoke: A burning smell indicates the motor armature is overheating or shorting out. Turn the machine off immediately to prevent a fire.
• Sputtering or Intermittent Power: If the motor cuts in and out, the carbon brushes have likely worn down to the point where they are no longer making consistent contact with the commutator.

Key Checks Before Motor Replacement

Carbon Brushes:

Before you purchase and replace a motor, check the carbon brushes. Motor brushes are designed to rub against the spinning metal, which wears down over time, just like brake pads on car wheels. The carbon brush delivers electrical current to the rotating armature; if the brush loses contact, the motor will stop receiving power and cease operation.

Ametek motors are designed with easily replaceable brushes. If your motor has stopped turning on, but showed no prior signs of burning or grinding, installing a new set of carbon brushes (often between $15-$30) can easily add another 500 to 1,000 hours of life to the motor.

For step-by-step instructions on how to safely replace carbon brushes in your vacuum motor, see Tom's Way's comprehensive tutorial: How to Change Vac Motor Brushes.

A good best practice for preventive maintenance is to inspect brushes every 500 hours of operation. If the carbon rod is worn down to a quarter-inch or less, replace it immediately to prevent damage to the armature.

Browse our complete range of replacement vacuum motor brushes to find the right fit when you need to order new ones.

Gaskets:

Before installing a replacement vacuum motor, inspect the gaskets. If this seal is compromised, the motor will pull air through gaps in the seal and the vacuum hose, significantly reducing suction power. Gaskets are found between the motor and the top of the vacuum canister housing, and between the clean-out door and the side of the canister.

Several clear signs indicate when a gasket is worn. In our Fix It With Phil YouTube series, Phil covers these indicators and demonstrates gasket replacement in his "Replacing Vacuum Door Gaskets" tutorial. Most warning signs—such as visible cracks or loss of flexibility—apply to all gaskets, except for his specific tip about checking latches on the closeout door. The Tom's Way video referenced in the next section provides step-by-step guidance for replacing the gasket located between the motors and the vacuum housing.

We have a large inventory of replacement vacuum motor gaskets to help you create an effective seal between the vacuum housing and the new motor, ensuring adequate suction.

How to Replace a Vacuum Motor

If you need to replace a vacuum motor inside vacuum motors of canister-style vacuums on self-serve islands, refer to our Tom's Way video "How to Service Your Vacuum Cleaner" for an easy guide on how to replace the vacuum motor and the gasket, which creates the seal between the motor and the vacuum's housing. Motor Replacement tutorial begins at the video's 2:50 mark.

1. Safety First: Before you start, disconnect all power to the vacuum. Never work on a vacuum unit while it is connected to a live electrical source. Always use a licensed electrician unless you know exactly what you are doing or have a license yourself.
2. Disconnect the Wiring: If you do not have a wiring diagram for your replacement motors, take a clear photo of the wiring setup before disconnecting any connections. This ensures you can accurately reinstall the wiring for proper performance and avoid unnecessary troubleshooting. Disconnect the wiring yourself if you are trained to do so, or use a qualified electrician.
3. Remove the Dome: Loosen the screws on the bottom. You don't need to remove them. Once the screws have been loosened, twist or turn the dome. The screws should now be aligned precisely with the larger diameter holes, allowing them to pass through and enabling you to remove the dome easily.
4. Remove the Hold Down Bracket: Use a socket wrench to remove the bolt securing the hold-down bracket to the vacuum. The socket size will vary across different vacuum models and manufacturers.
5. Remove the Screws Securing the Motor to the Bracket: Use a 5/16" nut driver to remove the 5/16" screws securing the motor to the bracket. The screw size and quantity used to secure each motor can vary between models and manufacturers. This will impact the size of the nut driver you'll need. Repeat this for each motor on the vacuum.
6. Remove the Motors and Hold-Down Bracket: Now that the screw are out of the picture, each motor can be removed from the hold-down bracket. Set aside the motor/s you want to keep unless you are replacing all of them. Now remove the hold-down bracket and set it aside. You'll need it later.
7. Gasket Replacement: When replacing a motor, we highly recommend replacing the gasket too. This ensures your new motor can produce its maximum suction power. The gasket replacement tutorial begins at the 3:58 mark of the video.
   1. Use a scraper to remove the old gasket. You don't need to remove 100% of the leftover adhesive residue.
   2. Take the new gasket and remove the backing.
   3. Center the gasket over the hole.
   4. Place it down and run your fingers around the diameter to secure it.
8. Wire the Motors: Follow the wiring diagram provided by the manufacturer, and either wire the motor yourself if you have the know-how, or have a licensed electrician wire it.
9. Secure the New Motor/s: Place all the motors over the gaskets and center them. Then add the mounting bracket back. Place the hold-down nut and tighten it, but don't drive it home. You'll want to be able to adjust this later. The screw holes on the motor must align precisely with the mounting bracket holes to ensure secure installation. Once properly aligned, fasten the screws to ensure a tight seal and the gasket's longevity. Now you can tighten the hold-down nut.
10. Reinstall the Vacuum Dome: Place the dome back on the vacuum. Align the screws with the larger holes in the dome. Rotate the dome to shift the screws over the smaller holes, then tighten them to secure the dome. This ensures the dome is properly fastened to the vacuum canister.

Frequently Asked Questions (FAQs)

Is it worth replacing a vacuum motor?

Yes, absolutely! High-quality commercial vacuum housings, central vac canisters, and detailing extractors are expensive pieces of equipment. The stainless steel tanks and structural components can last decades. Replacing a worn-out motor with an Ametek replacement restores the machine to brand-new performance for a fraction of the cost of buying an entirely new vacuum system.

How much does it cost to replace a vacuum cleaner motor?

The price of an Ametek Lamb replacement motor typically ranges from $100 to $350. Compare that to the $1,500 to $8,000 price of a new self-serve canister vacuum. A motor replacement is a highly cost-effective maintenance expense compared to buying a whole new vacuum. There are cheaper and more expensive options of replacement vacuum motors, but that is the typical price range. 

Can a vacuum cleaner motor be repaired?

Minor repairs, such as replacing the carbon brushes or swapping a worn gasket, are routine and highly recommended maintenance best practices that help increase the longevity. However, if the internal components have suffered catastrophic failure—such as burnt electrical windings, shattered impeller fans, or seized bearings—it is rarely cost-effective or safe to rebuild it. In these cases, swapping the entire motor unit is the best industry practice. Also, we don't currently sell any of those internal components. However, we do stock replacement motor brushes and gaskets if you need those items.

How do I find the correct replacement motor part number?

The most accurate way to find your replacement is to look at the sticker or stamped metal plate on the side of your existing motor. You will typically find a part number starting with "11" (for example: 116336-01, 116472-00, or 116765-13). Search this exact SKU on our site to find the direct, drop-in Ametek replacement. If the sticker is unreadable, consult your equipment manual. You can also contact the vacuum's manufacturer or our reliable team with your vacuum's make and model, and we will help you find the right replacement.