Caterpillar Inc.

John P McDonnel

Alan Ray Stockner

Glenn Brian Cox

Michael James Pollard

Sridhar Thangaswamy

John Jay Truhan, Jr

A pumping mechanism is disclosed. The pumping mechanism may include a barrel formed of a barrel substrate and including a first end surface, a second end surface opposite the first end surface, and a bore between the first and second end surfaces. Each of the first and second end surfaces and the bore is coated with a metal plating. The pumping mechanism may further include a plunger formed of a plunger substrate and configured to be slidably disposed in the bore in barrel, the plunger substrate having a tribological coating.

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Dewitt, IA, United States of America

John P McDonnel