Steering Gear · Steering Gear
Frydenbø RV 850-3 — Rotary vane steering gear, 3-vane variant for medium vessels.
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Source: industrialmarinepower.com · not checked against a manufacturer datasheet
| Hydraulic oil sampling/analysis | typically every 6-12 months, or per class/manufacturer's programme |
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| Hydraulic oil full change | typically every 2-4 years or on condition from oil analysis |
| Steering gear function/changeover test | before every departure (SOLAS), logged |
| Seal and gasket renewal | on condition, typically at major overhaul intervals of several years |
| Full internal overhaul (vane and seal inspection) | typically every 5 years or per class survey cycle - gear-specific, confirm with maker's manual |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Vane tip / stator clearance | typically within a manufacturer's tolerance of a few tenths of a millimetre for this class of gear - confirm against the maker's manual, do not reuse a scored rotor without maker guidance |
|---|---|
| Rudder stock coupling backlash | class societies typically require this within a small fraction of a degree - refer to the vessel's approved figures |
| Hydraulic oil cleanliness | target an ISO 4406 code appropriate to the proportional/servo valves fitted - confirm against the maker's specification |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Steering gear is Continuous Machinery Survey eligible on many class rules; surveyor checks the SOLAS steering gear test record, changeover test, main and auxiliary power unit operation, alarms, and rudder angle indication against the helm. Internal examination of the vane/ram assembly is typically required at a fixed interval (commonly 5-yearly) or on condition.
Estimated lifetime: Rotary vane steering gears of this class are generally designed for the vessel's full service life (20-25 years) with periodic seal, bearing and valve renewal, rather than treated as a wear-out component on a running-hours basis.
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