Example Cartridge Seals

New cartridge seal.
Cartridge seal with an acceptable bubble - this seal is okay to use.
Nearly empty cartridge seal - this seal should have been replaced when the oil level reached 1/2 of the original volume.

Cartridge seals like this should not be used.

Cartridge seal with contamination - this seal should be replaced.

Cartridge seals like this should not be used.


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Pro 4 Maintenance Manual, Version: Novice 1.00.00
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