Power Steering Pumps

What Is a Power Steering Pump and Why Does It Matter?

Whether you're piloting a heavy motorhome down a mountain highway or navigating a twin-engine sportfisher through a tight inlet, the power steering pump is the heart of your hydraulic steering system. It is the component that makes the difference between white-knuckle effort and effortless, fingertip control at the helm.

In both RV and marine applications, the power steering pump works by pressurizing hydraulic fluid and supplying it to the steering circuit. In a marine power steering system, this engine-driven pump sends high-pressure hydraulic fluid to supplement the mechanical effort at the helm wheel, so that turning the rudder or engine becomes a smooth, manageable task rather than a physical workout. As one industry resource describes it, the power assist pump feeds into the steering system to supplement the "arm-driven" passive helm pump — reducing steering effort dramatically, sometimes down to what feels like finger force.

For RV drivers, the pump performs a similar role: it pressurizes the power steering rack or gearbox so that maneuvering a 30,000-lb motorcoach feels as natural as driving a sedan. A failing or worn-out pump is one of the most noticeable problems you can encounter on the road or water — symptoms include stiff steering, whining noises, fluid leaks, and a general loss of responsiveness. Replacing a worn pump promptly is critical for both safety and the longevity of connected steering components like the ram, hoses, and gearbox.

Key Considerations When Shopping for a Replacement Power Steering Pump

• OE Fit vs. Performance Upgrade: Most RV and marine applications call for a direct-fit replacement that matches the original equipment specifications, including pressure output, shaft type, and port configuration. Verify that the replacement pump is designed for your exact engine family.
• New vs. Remanufactured: Remanufactured pumps offer a cost-effective path back to OE performance, provided the rebuilder replaces all wear components — including seals, O-rings, and bearings — and performs hydraulic efficiency and pressure testing. New units eliminate uncertainty about core condition but typically carry a higher price tag.
• Seal and Material Quality: In marine environments especially, seal quality is paramount. Look for units built with premium HNBR (hydrogenated nitrile butadiene rubber) seals, which resist heat breakdown far better than conventional seal materials.
• Pressure Relief Valve Calibration: Marine steering systems often operate at different pressures than their automotive counterparts. Ensure the pump's pressure relief valve is properly calibrated for your application to avoid over-stressing downstream steering components.
• System Flush: When replacing a pump — especially after a failure — always flush the system and replace hydraulic hoses if they show deterioration. Debris from old hoses or a failed pump can quickly damage a new unit.

Top Brand in RV & Marine Power Steering Pumps

Cardone is one of the most widely recognized names in remanufactured steering components. Cardone's power steering pumps are engineered to meet or exceed OE performance specifications, with each unit undergoing a hydraulic efficiency test and computer testing to measure pressure, fluid flow, valve operation, and noise. Every pump is built with 100% new O-rings and premium-grade HNBR seals, and shafts are surfaced to precise specifications to minimize premature seal wear. Cardone also offers a growing line of all-new (not remanufactured) power steering pumps for applications where a reman core is not available or preferred.