Find Input Part OEM number or machinery model MARINE GEAR Select model MARINE GEAR Caterpillar parts: For full view, you need register 3181 MARINE GEAR 3181 54E (1958) 3192 MARINE GEAR 3192 74E (1972) 7251 MARINE GEAR 7251 74E (1972) online parts diagram catalog Search for genuine and aftemarket cat parts.