Carbon brush mechanism for Ametek Lamb vacuum motors, Ametek part number 33378. The carbon brush is the wearing contact that carries current to the motor's commutator. As it wears down the motor loses power, sparks, or stops altogether. Ametek supplies the brush together with its spring-loaded holder as one serviceable assembly, and a motor uses two of them.
Specifications
- Ametek Lamb part number: 33378
- Ametek's own designation: brush mechanism
- Quantity used per motor: 2
- Two-brush service kit part number: 833378-50
- Replace when: the carbon has worn shorter than 3/16 inch
Service notes
Ametek's motor schematics state that replacing the armature or the field also requires replacing the brush mechanism. Because a motor takes two, order in pairs unless you are replacing a single damaged unit.
Fits
Ametek's own schematic for motor 116354-00 calls out part 33378 as the brush mechanism for that motor. Distributor cross-references list 33378 against a wide range of further Lamb motor numbers, including 116657-00 and 117307-00. Ametek Lamb motor numbers run to hundreds of variants and brush parts differ between them, so confirm the brush part number against the schematic for your exact motor number before ordering.
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