Posted by Dean on January 12, 2021 at 09:36:34 from (68.39.250.176):
In Reply to: Re: After market parts? posted by jimg.allentown on January 12, 2021 at 08:02:14:
Indeed, few parts are made by the tractor manufacturer. The days of vertical integration are long gone.
That said, OEM manufacturers must warranty their products so they attempt to control the quality of parts, wherever produced. Manufacturers prepare specifications that suppliers must adhere to and such specifications include penalties for failure to comply. Yes, most QC (not QA) is now done by the component manufacturers (has been for decades), and suppliers do not wish to have entire lots of parts rejected (for whatever reason) so they are incentivized to produce (or at least supply) quality components.
The situation is much different in the aftermarket. Aftermarket distributors may or may not prepare component specifications and QA may or may not be done by the distributors. QC is usually done by the component manufacturers but tolerances may well be relaxed significantly. Indeed, it was once (and probably still is) routine for component manufacturers to select and ship the "best" components to the OEM manufacturers while shipping the outliers to other purchasers, e.g., aftermarket distributors.
This, of course, begs the question as to whether the parts divisions of the OEM manufacturers are specifying OEM quality components for the parts division or accepting the outliers supplied to the aftermarket.
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