Leading producer of hydraulic valve spools and components.

Complete list of capabilities, equipment, quality standards.


Mobile, Industrial and Agricultural applications.


Trotter Manufacturing Inc. is considered one of the largest U.S. producers of hydraulic valve spools to off-highway equipment OEMs. The spools control the restriction and flow of high-pressure oil in hydraulic cylinder valves used tractor and construction equipment lines. Skip Trotter, President, likens his products to the processors in a computer: “Our spools are the brains of the valve and these products constitute 90% of our shipments.”