Upgrade your boat's steering with the reliable Raymarine ST4000MK2/ST4000+ wheel drive unit, a proven performer for wheel-steered vessels. This essential component clamps securely to your steering wheel, transforming manual navigation into effortless autopilot operation. Ideal for sailors who demand precision on open waters, it integrates seamlessly with SeaTalk networks, holding your course steady even in choppy conditions.

Whether you're replacing a worn drive on your existing ST4000 system or maintaining peak performance, this unit stands out for its straightforward setup and durable construction. Designed for boats up to 7,500 kg (16,500 lbs) laden displacement, it handles the demands of coastal cruising or longer passages with ease.

Why Choose the ST4000 Wheel Drive Unit?

Boat owners rave about the instant control switch via the adjustable clutch lever—no fumbling with knobs during critical maneuvers. Its rugged build shrugs off saltwater exposure, vibrations, and years of use, making it a staple for serious mariners.

• Effortless Installation: Clamps directly to wheels with 3 to 8 spokes and 1 to 3.5 turns lock-to-lock, minimizing downtime.
• Superior Handling: Delivers accurate heading hold, reducing fatigue on long watches.
• Versatile Compatibility: Works with ST4000+ and newer Raymarine wheel pilot systems via SeaTalk.
• Proven Durability: Fully enclosed design protects against the elements for reliable operation season after season.

Perfect Fit for Your Vessel

This wheel drive thrives on sailboats with wheel steering, supporting a range of wheel configurations. Check your setup: ensure 1-3.5 turns lock-to-lock and spoke count between 3-8 for optimal clamping. It's especially popular on mid-sized cruisers where space is at a premium but performance can't be compromised.

Installation Insights

Setting it up takes under an hour for most skippers. Position the clamp over your wheel spokes, tighten securely, and connect to your SeaTalk bus. Pro tip: Align the drive for smooth cable routing to avoid snags. Test the clutch early—smooth engagement means trouble-free steering transitions.

Maximizing Autopilot Performance

Pair this drive with your Raymarine course computer for responsive steering that adapts to wind shifts and waves. Sailors often note improved fuel efficiency and reduced helm time, letting the crew focus on sails and navigation. In moderate seas, it maintains headings within a degree or two, outperforming basic tiller pilots.

For best results, calibrate rudder response during calm conditions and monitor drive belt tension annually. This unit's torque delivery shines on boats with responsive steering gear, preventing the overcorrections common in heavier setups.

Long-Term Care for Peak Reliability

Keep it humming with simple upkeep: Rinse with fresh water after every outing to fend off corrosion. Inspect the clutch lever for smooth action and lubricate pivot points sparingly with marine grease. Most users report decades of service when stored properly during off-seasons.

• Rinse post-use to remove salt buildup.
• Check mounting bolts quarterly.
• Avoid extreme angles beyond lock-to-lock limits.

Frequently Asked Questions

What boats is the Raymarine ST4000 wheel drive suitable for?

It's ideal for wheel-steered sailboats up to 7,500 kg (16,500 lbs) laden displacement, fitting most cruising yachts with 1-3.5 turns lock-to-lock steering.

Does this include a full autopilot system?

No, this is the wheel drive unit only. It requires a compatible Raymarine autopilot computer and display for complete operation.

How do I switch between autopilot and hand steering?

Use the adjustable clutch lever for instant, one-handed switching—engage for autopilot, release for manual control.

What wheel types does it fit?

Compatible with 3, 4, 5, 6, 7, or 8-spoke wheels, as long as lock-to-lock turns are 1-3.5.

Is it SeaTalk compatible?

Yes, it connects via SeaTalk for integration with ST4000+ and newer Raymarine wheel pilots.

How rugged is this drive unit?

Fully enclosed and built for marine environments, it withstands saltwater, UV, and mechanical stress reliably.

What's the easiest way to install it?

Clamp to the wheel spokes, secure the bolts, route cables cleanly, and test the clutch—most installs take 30-60 minutes.

The Mk II Wheel Drive unit clamps directly to your boat's steering wheel delivering on both a simple installation and superb autopilot performance. It is equipped with a convenient, adjustable clutch lever that allows you to instantly switch between autopilot control and hand-steering. The drive will fit wheels with 3, 4, 5, 6, 7 or 8 spokes and is designed to work with steering system with between 1 and 3.5 turns lock-to-lock.

Raymarine E12093 Attributes

• Grip Color: Gary
• Number Of Spokes: 4
• Spoke Color: Silver

Raymarine E12093 Features & Benefits

• Wheel Drive Unit Is Recommended For Wheel-Steered Sailboats Up To A Maximum Laden Displacement If 7500 Kilogram
• Wheel Drive Unit Clamps Directly To Your Boat's Steering Wheel Delivering On Both A Simple Installation And Superb Autopilot Performance
• Equipped With A Convenient, Adjustable Clutch Lever That Allows You To Instantly Switch Between Autopilot Control And Hand-Steering
• Rugged Design And Reliability
• Limited 2 Year Warranty

Raymarine E12093 Warranties

• Raymarine-Global-Limited-Warranty-01-Jul-17-rev1-0.pdf

ST4000MK2/ST4000+ Wheel Drive Only *Not A Complete Pilot

The Raymarine ST4000MK2 is a SeaTalk compatible autopilot that will steer your boat to a heading automatically, accurately, and reliably.

*Package contains wheel drive only - not a complete autopilot.