Carbon Brushes Kit for 240V Eternity Lamb Ametek Motor 8505967-50

Carbon Brushes Kit for 240V Eternity Lamb Ametek Motor 8505967-50

• Lamb Ametek Eternity carbon brush kit 
• Kit of 2 brushes
• Lamb Ametek Part # 8505967-50
• For 120 Volts motor
• Fits Lamb Ametek motors:
• 122133-00 122167-00 122171-07 122175-00 122176-18 122315-18 122483-01 122483-00 122483-27

32.00 $CAD

Additional Informations:

My central vacuum or vacuum cleaner smells burnt, fire or smoke, what should I do?

Immediately stop using the vacuum to avoid further damage. It's likely that your carbon brushes are completely worn out, and the conducting wire in the brushes is damaging the motor rotor. At this stage, it's preferable to replace the entire motor unless a visual inspection suggests that the motor can be rehabilitated with sanding the armature and a new set of carbon brushes.

My central vacuum is making a loud noise, what should I do?

An intensely loud motor noise usually indicates that the ball bearings are failing and seizing. We recommend stopping the use of the vacuum immediately and inspecting the motor. When the motor is sufficiently cooled, manually rotating the motor rotor should reveal the condition of the ball bearings. If there's obvious friction or if there are small steel balls in the vacuum motor housing, the motor should normally be replaced entirely or refurbished.

When should I replace the carbon brushes on a vacuum motor?

Typically, carbon brushes on the vacuum motor should be replaced before reaching the critical 90% of wear stage or when you only have left about 3/16in or carbon. Replacing the carbon brushes is preventive maintenance to avoid damaging other parts like the rotor or motor armature. The rotor or armature is the central part that rotates on itself.

Most carbon brushes have a small conducting wire in the carbon part. This wire can scratch the armature and permanently damage it. When an armature is damaged, the motor fire becomes erratic, and the amperage is generally no longer stable. Additionally, a damaged rotor surface (small notches in the metal) can break newly installed carbon brushes.

For small surface scratches on the rotor or armature, there's a small stone for sanding or polishing the rotor surface. This small stone can extend the life of your motor.

What is the lifespan of my motor after replacing the carbon brushes?

Firstly, it's important to know that a standard motor with a diameter of 5.7 inches with at least 2 stages (2 fans) from brands like Lamb Ametek, Domel, or Electro Motor should last an average of 800 hours.

When the original set of carbon brushes is completely worn out, and depending on the wear of the rotor and ball bearings, a motor should last about 400 more hours after replacing the carbon brushes with a new set.

In total, a motor of this type should not last more than 1200 hours with preventive replacement of original brushes around 700 hours.

Some motor manufacturers and vacuum cleaner manufacturers even recommend replacing the brushes every 500 hours of use.

Why couldn't my vacuum motor survive more than 2 sets of carbon brushes?

Carbon brushes are not the only parts that undergo normal wear on a vacuum motor. There's wear on the rotor (armature) and wear on the ball bearings.

Wear of the armature (rotor):

The armature wears down where it makes contact with the carbon brushes. An arch or groove is created in the rotor metal where the brushes make contact. After some time, the hollow becomes so pronounced that the armature needs to be replaced. The cost of the armature, along with the time and complexity needed to disassemble and reassemble the motor, generally makes this operation less attractive in terms of value for money. Because, in addition to the armature, for a complete refurbishment operation, you need to add the cost of ball bearings and a new set of carbon brushes. The cost of a new motor and the ease of replacing only the motor are often two factors that make people and specialized technicians prefer to replace the entire motor.

Ball Bearings:

Ball bearings are also a potential cause of a vacuum motor's demise. Normally, after 2 sets of carbon brushes, the next parts that will fail are the ball bearings. Replacing the two ball bearings is a delicate operation that requires certain tools. Moreover, as long as you're replacing the ball bearings, for a complete refurbishment, it would be better to replace the rotor and brushes. As mentioned earlier, this complete refurbishment operation is not always worth the hassle, and most technicians prefer to replace the entire motor.

Can you replace brushes on a small vacuum motor?

The quick answer is yes, if the parts are available because they are not always. Smaller diameter motors, such as 4.5 inches, 4.7 inches, 5 inches, 5.25 inches, have a shorter lifespan because, in addition to being smaller, they generally have only 1 stage (1 fan). Since they are smaller and only have 1 fan, they need to spin faster to produce suction power. The stress that these small, high-revolution motors undergo often causes premature wear of the ball bearings. Generally, ball bearings will be the first to fail. The lifespan of some of these motors can be as short as 250 hours. This is the case for most motors found in vacuum cleaners sold in supermarkets or hardware stores, even if they have the label of a well-known brand.

The small motors found in Shop-Vac type workshop vacuums are generally no-name Chinese origin motors with no possibility of getting spare parts. That's why large quantities of these machines end up in landfills with no possibility of being repaired.

How do I know if I can repair my vacuum motor?

The best thing is to email us pictures of your motor, along with the brand and model of the vacuum cleaner. Take the time to attach any numbers you may find on the device and the motor itself.

Here is an example of the informations we need:

Call us for more information

1-888-908-0962

Send us your photos and information to this email address: