Raymarine · Autopilot

Raymarine EV-200 / EV-300 / EV-400

The EV-200, EV-300 and EV-400 are the larger Raymarine Evolution autopilots, sold as packs since 2013 for boats that need more steering power than the EV-100 gives. Each pairs the EV-1 heading sensor and a p70s or p70Rs head with a bigger 12/24 V actuator control unit below deck: the ACU-200 (15 A) runs the Type 1 linear and rotary drives and the Type 1 hydraulic pumps, the ACU-300 runs solenoid-valve steering and constant-running pumps, and the ACU-400 (30 A) runs the Type 2 and Type 3 drives, pumps and hydraulic linear drives for yachts up to 35,000 kg. The EV-1 sensor, the p70s/p70Rs heads and the SeaTalkng cabling are the same as on the EV-100 — see the EV-100 page for their part numbers; this page lists what differs: control units, drives, pumps and the rudder reference. Unlike the ACU-100, these units can power the SeaTalkng backbone and switch a drive clutch or bypass valve, and the EV-400 packs come with the M81105 rudder reference.

Manuals & documents

The links go straight to Raymarine. We host no manuals or drawings — the manufacturer’s copy is the current one.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Control unitE700991,2—ACU-200 actuator control unit for the EV-200 Sail and Power packs: 15 A, 12 or 24 V, for the Type 1 linear and rotary drives and the Type 1 hydraulic pumps. Joins the backbone with the R12112 spur cable.
Control unitE701391,3—ACU-300 for the EV-300 Solenoid pack: switches the solenoid valves of solenoid steering and of the constant-running pumps E12171/E12172. Needs the M81105 rudder reference and ACU software v3.13 or later.
Control unitE701001,4,5,6—ACU-400 for the EV-400 Sail and Power packs: 30 A, 12 or 24 V, for the Type 2 and Type 3 drives, pumps and hydraulic linear drives. Units in the 2022 recall serial ranges are shut down by ACU software v3.14 and later — check the serial number before buying one used.
Drive unit (motor, ram)M811307,8,9—Type 1 mechanical linear drive, 12 V, supplied in the EV-200 Sail pack T70158: 300 mm stroke, with mounting foot and tiller pin assembly; runs on the ACU-200.
Drive unit (motor, ram)M81131 · M81133 · M81132 · M811347,10—Type 2 mechanical linear drives for the ACU-400: short stroke (300 mm) M81131 at 12 V and M81133 at 24 V, boats up to 15,000 kg; long stroke (400 mm) M81132 at 12 V and M81134 at 24 V, up to 20,000 kg.
Drive unit (motor, ram)M81135 · M81136 · M8113711,12,13—Rotary drives for chain-and-sprocket steering: Type 1 M81135 (12 V, ACU-200), Type 2 M81136 (12 V) and M81137 (24 V, ACU-400). Mounting foot and three shims come with the drive; sprocket and chain are extra. Sprockets (3/8 in pitch): 13 tooth M81182, 15 tooth M81183, 17 tooth M81184, 19 tooth M81185, 25 tooth M81186 — chosen from the turns of the steering shaft lock to lock (two turns: 13 tooth on a Type 1, 15 tooth on a Type 2).
Drive unit (motor, ram)E12207 · E12208 · M81202 · M8120314,15,16replaces M81200replaces M81201—Hydraulic linear drives (pump, ram and reservoir in one unit) for mechanically steered boats, on the ACU-400: Type 2 E12207 (12 V) and E12208 (24 V), up to 22,000 kg; Type 3 M81202 (12 V) and M81203 (24 V), up to 35,000 kg. E12207 replaces M81200 and E12208 replaces M81201; the new Type 2 is plumbed and mounted differently, so read the product differences in manual 81177 before swapping.
Pump assemblyM81120 · M8111917,18,19,20,21—Type 1 reversing hydraulic pump: M81120 at 12 V (ACU-150 or ACU-200) and M81119 at 24 V (ACU-200), for steering cylinders of 80–230 cc; supplied in the EV-200 Power pack T70157. With any of the reversing pumps: a single helm without check valves, or a long pipe run, needs the double pilot check valve M81166; to drive a secondary ram on a mechanically steered boat, add the 12 V solenoid bypass valve M81167 on the ACU’s clutch terminals.
Pump assemblyM81121 · M81123 · M81122 · M8112417,22,23—Type 2 and Type 3 reversing hydraulic pumps for the ACU-400: Type 2 M81121 (12 V) and M81123 (24 V) for cylinders of 230–350 cc; Type 3 M81122 (12 V) and M81124 (24 V) for 350–500 cc.
Pump assemblyE12171 · E1217224,1—Constant-running hydraulic pumps with variable flow, E12171 (12 V) and E12172 (24 V), for large steering cylinders of 1000–1500 cc. The ACU-300 switches their solenoid valves; the pump motor has its own feed with a 60 A (12 V) or 40 A (24 V) breaker.
Rudder reference sensorM811051,25,26—Rotary rudder reference transducer for every ACU: included in the EV-400 packs and required with the ACU-300. Comes with 10 m cable and the linkage (tiller pin, two ball joints, stud).
CableR121121—ACU to SeaTalkng spur cable, 0.3 m, for the ACU-200, ACU-300 and ACU-400 (and SPX course computers): joins the ACU to the backbone and can feed 12 V into it. The ACU-100’s bare-wire cable is not used on these units. Backbone and spur cables, T-pieces and terminators are the same as on the EV-100 (see the EV-100 page).
Pilot check valveM8116617,20—Double pilot check valve for Type 1 hydraulic pumps on steering systems without lock valves.
Solenoid bypass valveM8116717,21—Bypass valve for hydraulic steering systems with an Evolution pump.
Drive sprocketM81182 · M81183 · M81184 · M81185 · M8118611—Sprockets for the rotary drive chain; sizes per the rotary drive manual.

Numbers checked against the sources below on 12 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
Full serviceACU-200/300/400 and EV-1: nothing scheduled and no user-serviceable parts; clean with the power off and a damp cloth only, as on the EV-1001
Electrical connectionsRegularly (Raymarine gives no hours or months): check power, drive and network cables for wear or damage and every connection for tightness, at the ACU and at the drive1,7,11,17
LubricationMechanical linear drives, before every passage: mountings and alignment secure, cables sound, drive dry, no clicking, grinding or odd vibration (if there is, have it serviced before further use); keep the swivel joint and rod end lightly greased with waterproof grease7
Full serviceMechanical linear drives: service by a Raymarine-authorised agent every 2 years or 1000 hours, whichever comes first (manual 81175-8; the 2007 edition said every 2 years for heavily used drives)7,27
LubricationRotary drives, regularly: check mountings, chain and sprocket alignment and tension, and cables; grease chain and sprockets lightly. Heavily used drives: service every 2 years by an authorised agent11
Hoses & clampsHydraulic pumps, regularly: check connections, mountings, pipes and cables, and look for leaks; check again for air and leaks 24 h after installing and bleeding. Hydraulic fluid at the motor coupling means the pump shaft seal must be replaced (dealer job); no user-serviceable parts17
Oil level checkHydraulic linear drives, yearly: fluid level between MIN and MAX on the reservoir (mineral oil ISO VG10–VG40); external oil loss means the system needs bleeding. Regularly: mounting foot, tiller pin, ram alignment, pipes and cables, and grease the rod end with a marine grease that suits nitrile seals14
Software updateBefore commissioning and whenever a new release appears: update the EV-1 first, then the ACU, and bring the p70s/p70Rs head up to date too, through a Raymarine chartplotter on the backbone (older a/c/e/eS/gS displays need v13.37 or later, G-Series v4.49 or later); recalibrate the autopilot afterwards6,28

From Raymarine’s installation instructions 87180, the drive manuals 81175 (mechanical linear), 81174 (rotary), 81178 (hydraulic pumps) and 81177 (hydraulic linear) and the Evolution software pages. Raymarine gives hours and years only for the mechanical linear drives; everything else is “regularly”.

Specifications

TypeEV-1 sensor core (as on the EV-100) + ACU-200, ACU-300 or ACU-400 actuator control unit + p70s or p70Rs head or a LightHouse chartplotter + drive unit, all on one SeaTalkng / NMEA 2000 backbone. Rudder reference M81105: required with the ACU-300, recommended with the others1
ModelsEV-200 Sail T70158 (p70s, EV-1, ACU-200, Type 1 linear drive M81130, cabling kit), without drive T70155; EV-200 Power T70157 (p70Rs, EV-1, ACU-200, Type 1 hydraulic pump), without drive T70156; EV-300 Solenoid T70160 (p70Rs, EV-1, ACU-300, cabling kit); EV-400 Sail T70161 (p70s) and EV-400 Power T70162 (p70Rs), both with EV-1, ACU-400, rudder reference and cabling kit, drive bought separately9,19,29,30,31
ControlACU-200 (E70099): Type 1 linear drive, Type 1 rotary drive, Type 1 hydraulic pumps (12 and 24 V) and the universal I/O stern drive; clutch output switchable to 12 or 24 V1,2
ControlACU-300 (E70139): solenoid-valve steering and constant-running pumps; no clutch output, bypass-valve output switchable to 12 or 24 V; needs the M81105 rudder reference and ACU software v3.13 or later1,3
ControlACU-400 (E70100): Type 2 linear and rotary drives, Type 2 and Type 3 hydraulic pumps and hydraulic linear drives; extra digital in/out port and a VMU adapter connection for ZF sail pod drives1,4
Voltage12 or 24 V DC nominal, operating range 10.8–31.2 V (all three ACUs). The drive must match the boat’s voltage: the Type 1 linear and rotary drives are 12 V only; pumps, Type 2 linear and rotary drives and hydraulic linear drives come in 12 V and 24 V versions2,7,11
Current drawStandby 300 mA (each ACU); continuous drive output: ACU-200 15 A, ACU-300 5 A to the solenoids, ACU-400 30 A; clutch output: ACU-200 up to 2 A per manual 87180 (the product page says 4 A), ACU-400 up to 4 A1,2
Breaker / fuseSupply fuse or thermal breaker: ACU-200 20 A, ACU-300 15 A, ACU-400 40 A, inline at the battery or on the panel; inside each ACU a blade fuse of the same rating plus a 3 A SeaTalkng fuse, spares under the front cover. A constant-running pump motor needs its own feed: 60 A Class D breaker at 12 V, 40 A at 24 V1
Data connectionsSeaTalkng / NMEA 2000 through the 0.3 m ACU spur cable R12112. The ACU can feed 12 V into the backbone (3 A, fused, switchable); on 24 V boats the ACU-400 shares 8 A at 12 V between backbone and clutch. Only one power feed per backbone: switch the ACU’s output off if the backbone has its own power cable1
Max boat displacementType 1 linear M81130 and Type 1 rotary M81135: 11000 kg (24000 lb) per raymarine.com and manual 87180, 10000 kg (22000 lb) in the drive manuals; Type 2 short linear: 15000 kg; Type 2 long linear and Type 2 rotary: 20000 kg; Type 2 hydraulic linear: 22000 kg; Type 3 hydraulic linear: 35000 kg. Add 20 % to the bare displacement for load. Hydraulic pumps are chosen by cylinder volume instead (see flow rate)1,8,7
Flow rateReversing pumps — Type 1 (M81120 12 V, M81119 24 V): cylinders of 80–230 cc, 1000 cc/min, about 19 A at 12 V; Type 2 (M81121 12 V, M81123 24 V): 230–350 cc, 2300 cc/min, 24 A at 12 V / 11 A at 24 V; Type 3 (M81122 12 V, M81124 24 V): 350–500 cc, 3100 cc/min, 34 A at 12 V / 15.5 A at 24 V; all 55 bar max, 1/4 in BSPP ports, IP67 motor. Constant-running pumps E12171/E12172: cylinders of 1000–1500 cc, 4000/4500 cc/min17,24
ThrustMechanical linear drives — Type 1 M81130: 295 kg peak thrust, 300 mm stroke, 11 s hard over, 735 Nm max rudder torque; Type 2 short M81131/M81133: 480 kg, 300 mm, 11 s, 1190 Nm; Type 2 long M81132/M81134: 480 kg, 400 mm, 14 s, 1660 Nm. Length at mid-stroke 700 mm (850 mm for Type 2 long) on a 250 mm tiller arm (355 mm); four M10 bolts in the mounting foot7
ThrustHydraulic linear drives — Type 2 E12207 (12 V) / E12208 (24 V): 675 kg peak thrust, 254 mm stroke, 10 s hard over, 1270 Nm; Type 3 M81202 / M81203: 1000 kg, 300 mm, 12 s, 2565 Nm. Pump, ram with built-in clutch and reservoir come filled and bled14
Maximum torqueRotary drives — Type 1 M81135: 20 Nm peak; Type 2 M81136 (12 V) / M81137 (24 V): 34 Nm; both 33 rpm max output shaft speed, 10 s hard over, 3/8 in pitch chain, two M12 bolts in the mounting foot11
Hydraulic fluidHydraulic fluid: mineral hydraulic oil ISO VG10 to VG40 that suits nitrile seals (with a pump in an existing system, use what the helm pump maker specifies). Never brake fluid14,17
Power cable sizePower and drive cables, combined battery–ACU–drive length. Type 1 drives and pumps at 12 V, and a constant-running pump on the ACU-300: 2.5 mm² up to 3 m, 4 mm² up to 5 m, 6 mm² up to 7 m, 10 mm² up to 10 m, 16 mm² up to 16 m. Type 2 at 12 V: 6 / 10 / 16 mm² up to 5 / 7 / 16 m; Type 2 at 24 V: 4 / 6 / 10 / 16 mm² up to 3 / 5 / 10 / 16 m; Type 3 at 12 V: 10 / 16 / 25 mm² up to 5 / 7 / 16 m; Type 3 at 24 V: 6 / 10 / 16 mm² up to 5 / 7 / 16 m. Clutch and bypass-valve wires at least 1.5 mm²1
DimensionsACU-200 / ACU-300 / ACU-400: 285 × 211.5 × 64.5 mm4,3
WeightACU-200 / ACU-300 / ACU-400: 2.2 kg4,3
MountingACU: drip resistant only, so below deck in a dry place, on a vertical surface close to the battery, LED visible, at least 1 m from compasses; mounting template 871764,32
MountingRudder reference M81105: rotary sensor with 10 m cable; linkage arm ideally 140 mm (75–310 mm), parallel to the tiller arm with the rudder amidships; the template allows up to ±60° of travel, the ACU alarms beyond 50°; red, green and blue wires plus the grey screen go to the ACU25
SoftwareACU-100 to ACU-400: v3.15 (September 2023); EV-1 / EV-2: v3.21 (May 2026)6,28

Good to know

  • Choose the drive first and the control unit follows: Type 1 linear and rotary drives and Type 1 pumps run on the ACU-200; Type 2 and Type 3 drives and every hydraulic linear drive need the ACU-400; solenoid steering and constant-running pumps need the ACU-300. Add 20 % to the bare displacement and keep some reserve for offshore sailing. For the Type 1 drives Raymarine’s website says 11,000 kg but the drive manuals say 10,000 kg — plan with the lower figure.1,8,7
  • Pick a hydraulic pump by the volume of the steering cylinder (stamped on it in cc or cu in), not by boat size, and take the pump whose range covers it: Raymarine says a size up or down brings nothing and can make the boat steer worse. On a single helm without check valves the pump would just turn the wheel, so fit the double pilot check valve M81166.33,17
  • Seal the pump’s 1/4 in BSPP ports with the bonded washers only — no PTFE tape, sealing paste or tapered fittings. The reservoir line has to rise all the way to the helm pump and must never be plugged. Bleed by running the pump against the wheel in both directions while topping up, then check again for air and leaks after 24 hours. Mineral hydraulic oil only, never brake fluid.17
  • Mount a linear drive at right angles to the tiller arm with the rudder amidships and the push rod at mid-stroke (700 mm on Type 1 and Type 2 short, 850 mm on Type 2 long), with no more than 5° between push rod and tiller arm. The boat’s own steering stops must limit the rudder to ±35° before the push rod reaches its end stop: running into the drive’s stops damages it and voids the warranty. Bolt the foot to a solid structural member, not to cabin joinery.7
  • Set the clutch-voltage switch on the ACU to 12 V for every Raymarine drive: even the 24 V drives have a 12 V clutch. The ACU can power the SeaTalkng backbone (3 A), but a backbone may have only one power feed, so switch the ACU’s SeaTalkng output off if the network already has its own power cable.1
  • Buying a used EV-400 or ACU-400 (E70100): check the serial number against Raymarine’s 2022 recall — 0620001 to 0720151 plus 0420339 and 0920329. From ACU software v3.14 an affected unit shows ‘Power & Motor cables are swapped’ and refuses to work; v3.15 freed a few unaffected units that had been shut down by mistake. Update the EV-1 first, then the ACU, then recalibrate; an ACU-300 must be on v3.13 or later and needs the M81105 rudder reference.5,6,1

Videos & how-tos

Links to YouTube, nothing embedded. The maker’s own channel comes first; the rest are channels we found clear and correct for this model.

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Sources

  1. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  2. raymarine.com/en-us/our-products/boat-autopilots/autopilot-acu/acu-200
  3. raymarine.com/en-us/our-products/boat-autopilots/autopilot-acu/acu-300
  4. raymarine.com/en-us/our-products/boat-autopilots/autopilot-acu/acu-400
  5. raymarine.com/en-us/support/acu-150-acu-400-product-recall
  6. raymarine.com/en-us/download/evolution-autopilot-acu-software
  7. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  8. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-1-linear-driv…
  9. raymarine.com/en-us/our-products/boat-autopilots/autopilot-packs/ev-200-sail-pilot
  10. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-2-linear-driv…
  11. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  12. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-1-rotary-drive
  13. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-2-rotary-driv…
  14. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  15. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-2-hydraulic-l…
  16. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-3-hydraulic-l…
  17. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  18. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-1-hydraulic-p…
  19. raymarine.com/en-us/our-products/boat-autopilots/autopilot-packs/ev-200-power-pilot
  20. citimarinestore.com/en/raymarine-autopilots-raymarine-autopilot-parts/5113-raymarine-doub…
  21. citimarinestore.com/en/raymarine-autopilots-raymarine-autopilot-parts/2570-raymarine-sole…
  22. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-2-hydraulic-p…
  23. raymarine.com/en-us/our-products/boat-autopilots/autopilot-drive-units/type-3-hydraulic-p…
  24. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  25. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  26. citimarinestore.com/en/raymarine-autopilots-raymarine-autopilot-parts/5112-rotary-rudder-…
  27. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  28. raymarine.com/en-us/download/evolution-autopilot-heading-sensors-software
  29. raymarine.com/en-us/our-products/boat-autopilots/autopilot-packs/ev-300-solenoid-pilot
  30. raymarine.com/en-us/our-products/boat-autopilots/autopilot-packs/ev-400-sail-pilot
  31. raymarine.com/en-us/our-products/boat-autopilots/autopilot-packs/ev-400-power-pilot
  32. teledyne.app.box.com/index.php?rm=box_download_shared_file&shared_name=rvhycb6x1brzo64921…
  33. raymarine.com/en-us/learning/online-guides/selecting-your-raymarine-drive-unit

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