Raymarine M81120 Type 1 Hydraulic Autopilot Pump - 12V Marine Steering System Drive Unit
Transform your boat's traditional hydraulic steering into a precision autopilot system with the Raymarine M81120 Type 1 Hydraulic Pump. This professional-grade reversing hydraulic pump integrates seamlessly with Evolution autopilot systems to deliver reliable hands-free navigation for vessels equipped with 4.9-14 cubic inch hydraulic steering cylinders.
Engineered for the demanding marine environment, this ABYC-compliant autopilot drive unit provides the power and precision needed to maintain course in challenging conditions while reducing crew fatigue during long passages.
Professional Marine Autopilot Performance
- High-Pressure Operation: Delivers maximum 750 PSI stall pressure at 12V for positive steering control in all sea conditions
- Optimal Flow Rate: 67 cubic inches per minute peak flow rate ensures responsive steering performance
- Versatile Compatibility: Works with S1/S1G and S2/S2G corepacks for flexible system configurations
- Wide Cylinder Range: Supports hydraulic steering rams from 4.9 to 14 cubic inches (80cc-230cc)
- Floor Mount Design: Robust mounting system withstands marine vibration and movement
Technical Specifications & Compatibility
Electrical Requirements
- Voltage: 12V DC marine electrical system
- Power Consumption: 24 watts typical operation
- Installation: Floor mount configuration
Hydraulic Performance
- Maximum Pressure: 750 PSI (50 bar) at 12V
- Peak Flow Rate: 67 in³/min (1000cc/min) no load
- Cylinder Capacity: 4.9-14 cubic inches (80cc-230cc)
System Compatibility
- Compatible ACU Units: Requires ACU-150 or ACU-200
- Corepack Options: S1/S1G (4.9-10.5 in³) or S2/S2G (4.9-14 in³)
- Steering Configuration: Traditional hydraulic steering systems
Marine Installation & Integration
The Type 1 hydraulic drive connects directly to your boat's existing hydraulic steering lines, allowing the Evolution autopilot to control steering by managing hydraulic fluid flow. This seamless integration maintains your manual steering capability while adding advanced autopilot functionality.
Professional Installation Considerations
- ABYC E-22 compliant installation ensures safety and performance standards
- EMC installation guidelines prevent interference with navigation electronics
- Hydraulic system bleeding required for optimal performance
- Compatible with two-line, three-line, and pressurized hydraulic systems
Ideal Marine Applications
- Cruising Yachts: Long-distance passages with reduced crew fatigue
- Sport Fishing Boats: Maintain precise trolling patterns and course holding
- Motor Yachts: Enhanced navigation comfort and safety
- Commercial Vessels: Reliable autopilot performance for working boats
Raymarine Quality & Support
Backed by Raymarine's 80+ years of marine electronics expertise, the M81120 features rugged construction designed for the harsh marine environment. The unit includes a comprehensive 2-year limited warranty and is supported by Raymarine's global dealer network for professional installation and service.
Frequently Asked Questions
What hydraulic steering systems are compatible with the M81120?
The Type 1 pump works with traditional hydraulic steering systems equipped with 4.9-14 cubic inch steering cylinders (80cc-230cc). It's compatible with both single and dual ram configurations when properly calculated for total system volume.
Do I need additional components for installation?
Yes, the M81120 requires an ACU-150 or ACU-200 Actuator Control Unit (sold separately) plus appropriate Evolution autopilot control head and course computer for complete system functionality.
Can this pump handle rough sea conditions?
Absolutely. The 750 PSI maximum pressure rating and robust construction ensure reliable performance in challenging marine conditions while maintaining precise steering control.
Is professional installation required?
Professional installation by an authorized Raymarine dealer is strongly recommended to ensure proper hydraulic connections, system bleeding, and ABYC compliance for optimal performance and safety.
What's the difference between S1 and S2 corepack compatibility?
S1/S1G corepacks support cylinder capacities from 4.9-10.5 cubic inches, while S2/S2G corepacks extend the range to 4.9-14 cubic inches. Both maintain the same 750 PSI pressure and 67 in³/min flow rate.
Upgrade your vessel's steering system with the proven reliability of Raymarine autopilot technology. The M81120 Type 1 Hydraulic Pump delivers professional-grade performance, seamless integration, and the confidence that comes with industry-leading marine electronics engineering.
