Unlock Reliable Autopilot Performance with Raymarine Hydraulic Linear Drive Type 3

For boaters tackling demanding offshore passages or those who demand precision steering on larger vessels, the Raymarine Hydraulic Linear Drive Type 3 stands out as a powerhouse in the Evolution autopilot lineup. This 24V system transforms your boat's mechanical steering into a seamless, autopilot-controlled setup without interfering with your existing helm feel. Unlike integrated hydraulic pumps that tie into your boat's primary steering fluid, this linear drive creates a fully independent hydraulic circuit—complete with its own ram, reversing pump, and reservoir—for unmatched reliability and zero maintenance hassles on your main system.

Imagine long nights at sea where fatigue sets in, but your autopilot confidently holds course through choppy swells. That's the edge this drive delivers, powering vessels with substantial displacement while keeping manual steering smooth and friction-free thanks to its built-in clutch mechanism.

How the Hydraulic Linear Drive System Operates

At its core, this setup mimics the push-pull action of a tiller or cable steering but with hydraulic muscle. The self-contained hydraulic ram extends and retracts up to 12 inches of stroke, delivering a staggering 2200 pounds of maximum thrust to wrestle rudders on bigger boats. The reversing pump, slaved to your Evolution autopilot's Actuator Control Unit (ACU-400), directs pressurized fluid to the ram, responding instantly to heading commands.

A key standout: the load-limiting system prevents overloads during heavy weather, protecting both the drive and your boat's structure. When you're hand-steering, the clutch disengages entirely, ensuring no drag or resistance—just pure, responsive control at the wheel.

Standout Specifications Tailored for Tough Conditions

• Drive Configuration: Hydraulic linear ram for direct rudder attachment
• Stroke Capability: 12 inches for ample rudder travel
• Peak Force: 2200 pounds—ideal for boats in the heavier displacement class
• Power Supply: Robust 24V operation for stable performance under load
• Control Interface: Seamless integration with ACU-400 for plug-and-play autopilot brains

Why Boaters Choose This Drive: Real-World Advantages

Steering systems fail at the worst times, but this Raymarine drive is engineered for endurance. Its isolated hydraulic loop means no shared fluid contamination, extending the life of your entire setup. Boaters report effortless course-holding in 20+ knot winds, where lesser drives falter.

• Enhanced Safety: Frees the helmsman for watchstanding, radar monitoring, or sail tweaks during extended cruises
• Superior Feedback: Evolution's adaptive algorithms learn your boat's steering dynamics for pinpoint accuracy
• Low Maintenance: Sealed components resist corrosion; simple fluid checks keep it running seasons on end
• Versatile Fit: Perfect upgrade for sailboats, power yachts, or fishing vessels with mechanical steering
• Quiet Operation: Minimal pump noise compared to electric rams, even at full thrust

Compared to rotary drives, the linear design excels where straight-line rudder force matters most, avoiding the binding issues of quadrant-mounted alternatives on spade rudders.

Streamlined Installation for DIY or Pro Setup

Raymarine prioritizes simplicity: mount the ram parallel to your rudder post, plumb the pump and reservoir nearby, and wire to the ACU-400. No custom brackets needed for most installations—feedback linkages adjust easily for optimal geometry. Pro tip: Position the reservoir high to aid priming and bleeding air from lines. Most installs wrap up in a weekend, with clear rudder alignment ensuring full stroke without binding.

"Swapped in a Type 3 on my 42-foot ketch—night-and-day difference in holding power upwind." – Experienced offshore sailor

Perfect Compatibility Within the Evolution Ecosystem

Built exclusively for ACU-400-equipped systems, it pairs flawlessly with p70/p70S course computers, quantum radar, and multifunction displays. Scale up to twin-rudder boats by syncing multiple units, or integrate with wind vanes for ultimate sailboat autonomy. It's the backbone for vessels pushing 10-20 tons loaded, where lesser drives tap out.

Long-Term Maintenance for Peak Performance

Keep it humming with annual fluid inspections—top off with Raymarine-approved hydraulic oil if levels dip. Flush every few years to clear any micro-debris. The rugged aluminum ram shrugs off UV and saltwater spray, but rinse fittings post-immersion. Troubleshooting? ACU diagnostics pinpoint issues via NMEA 2000, saving hours of guesswork.