Oil pump - a pump housing with pistons, spring, cam, washer, o-ring and stopper, - for a maximum capacity of about 21 m³ / min, - for precisely metered delivery of chain oil in Abhänigkeit of the engine speed, for greasing running on rails Chainsaw Chainsaw. "Liquid Pumps, other oscillating displacement pumps, metering pumps - the so-called oil pump."
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[1][1]. DE24824/14-1#437925
The article in question is described as an oil pump used in a chain saw. The oil pump is a piston pump that is actuated by gears from the output shaft of the chain saw engine. The function of the oil pump within the chain saw assembly is to lubricate the chain saw chain and chain bar. Photographs of the pump were submitted. In your request you offer that the pump is properly classified in subheading 8467.91.0100, Harmonized Tariff Schedule of the United States (HTSUS), which provides for parts of chain saws. However, we find that the oil pump is more specifically provided for in HTSUS heading 8413, which provides for pumps for liquids.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/R01141