Hydraulic Power Engines and Motors, Other Than Linear Acting

Rotary and oscillating hydraulic motors — including gear-type, radial-piston, and axial-piston designs — provide continuous or limited-rotation mechanical output for mobile machinery, industrial drives, and marine propulsion. The US schedule breaks out hydrojet engines for marine propulsion (8412294000) as a distinct line, then subdivides unlimited-rotary hydraulic engines by internal design: gear (8412298015), radial-piston (8412298030), axial-piston (8412298045), and other rotary (8412298060), with a residual line (8412298075) for remaining types. Japan leads US imports under this heading, reflecting the strong position of Japanese hydraulic equipment manufacturers in the global market, with Germany and the United Kingdom also significant sources. The internal design type — gear, radial-piston, or axial-piston — is the primary classification determinant and should be confirmed from manufacturer technical data.

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