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Library› Deck› Bow/Stern Thrusters› Bow/Stern Thruster› Rolls-Royce Marine / Kongsberg US (Azimuth Thruster) 805kW
Rolls-Royce Marine / Kongsberg

US (Azimuth Thruster) 805kW

Bow/Stern Thruster · Bow/Stern Thrusters

Technical data from manufacturer or class sources · not yet verified by a person
805 kWPower

Rolls-Royce Marine / Kongsberg US (Azimuth Thruster) 805kW — US (Azimuth Thruster), 805 kW, 56.4 kN thrust.

Specifications

Technical data.

Every value below comes from the manufacturer datasheet or class-society record on file for this model.

Power (kW)805
Thrust (kN)56.4
Thruster typeUS (Azimuth Thruster)
📄
Download datasheet (PDF) (952 KB)
Inspection

Inspector Detail

Common issues

  • shaft seal leakage at the lower gearbox allowing water ingress into gear oil
  • slewing bearing wear/backlash
  • gear oil contamination from seal leakage
  • vibration from propeller blade damage or heavy fouling
  • steering system (electric or hydraulic) faults affecting azimuth control
  • corrosion of the underwater housing and appendages
  • overheating of the drive motor under sustained high load

Inspection checklist

  • check gear oil level and condition (water/particulate contamination) in upper and lower gearboxes
  • inspect shaft seal for leakage
  • check slewing bearing backlash/play
  • inspect propeller blades for damage, pitting or fouling
  • verify steering gear and feedback system function
  • check sacrificial anode condition
  • inspect thruster room bilge for oil or water ingress
  • verify alarm and monitoring system function

Service intervals

Gear oil samplingevery 3-6 months
Gear oil changetypically annually or per maker's manual
Seal inspection/renewalat dry-dock or per running-hour interval per maker's recommendation
Slewing bearing grease/inspectionper maker's schedule, typically every 6-12 months
Sacrificial anode renewalat dry-dock or when approximately half consumed
Propeller/blade inspectionat dry-dock or by diver survey

Typical wear limits

Slewing bearing backlashcompare against the maker's new-build and maximum allowable backlash figure - this varies by unit size and must come from the maker's manual, not a generic value
Shaft seal leakageany continuous leakage beyond the maker's stated allowable drip rate calls for seal renewal

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • upper and lower shaft seal kits
  • slewing bearing seal kit
  • gear oil filter elements
  • sacrificial anodes
  • steering feedback sensors

Safety

  • crush/entrapment hazard during maintenance in confined thruster room
  • hydraulic system under pressure
  • electrical hazard at drive motor and control cabinet
  • lifting hazard during propeller/blade removal
  • risk of unexpected thruster movement if isolation procedure is not followed

Class survey

Azimuth thrusters are surveyed under class rules for steering/propulsion systems; surveyors typically review gear oil sample records and seal leakage history, and confirm steering gear operation including emergency/backup control during periodic and dry-dock surveys.

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