"> Rolls-Royce / Kongsberg Maritime (UK/Norway) Rotary Vane Steering Gear
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Rolls-Royce / Kongsberg Maritime (UK/Norway)

Rotary Vane Steering Gear

Rolls-Royce/Kongsberg Maritime is the world's largest manufacturer of steering gears with an estimated 25-30% market share. The Rotary-Vane design is the most modern and compact steering gear technology: 2 or 4 vanes in a cylindrical housing generate torque directly. No rudder shaft piston, no tiller arm — significantly fewer moving parts than Ram-Type. Standard on modern newbuilds of all sizes.

Torque 100-15,000 kNm
Capacity
Hydraulic Oil
Medium

Components & Design

Component data being added…

Technical Data

type Rotary Vane Type Steering Gear
variant count approx 5
period start year 1970
drive type Electric-Hydraulic
construction Cast steel housing, 2 or 4 vanes, dual HPU

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Common failures & inspection points

●Vane seal leakage causing internal bypass (most common failure)
●HPU motor bearing failure after 30,000+ hrs
●Solenoid valve sticking from oil contamination
●Helm pump relief valve malfunction
●Rudder feedback unit calibration drift

Service & Maintenance

Hydraulic oil analysis every 6 months. Vane seal inspection at drydock. HPU relief valve setting check annually. Rudder movement test (hard-over to hard-over in 28 sec per SOLAS). Emergency steering drill monthly. Complete overhaul every 10-15 years.

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Replacement Parts

Kongsberg Maritime (ehem. Rolls-Royce). Lead time: 3-8 weeks. Vane seals: keep onboard. Solenoid valves: 1 set onboard.
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Equipment Model #37893 · ✓ still in production