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Matched helical gear sets inside the Chelsea PTO Gear Kit are lapped together at the factory, so tooth contact patterns stay correct in a way that mixing gears from separate sets cannot match. That factory lapping matters most on a PTO that's already seen wear, since a new gear meshing against a worn mate would concentrate load on just a few teeth. Installing gears and plate as a matched set keeps backlash within the required range instead of relying on trial-and-error shim changes. The Chelsea 330154X includes the mounting plate needed to set gear backlash correctly during installation.
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