Bow Thruster · Bow/Stern Thrusters
Wärtsilä Underwater Mountable Steerable Thrusters (UMT) are azimuthing bow thrusters that can be installed fully underwater and serviced without dry‑docking, offering 360° continuous steering and a power range from 700 kW up to 6.5 MW depending on the product line.
| Gear oil sampling | every 500-1000 running hours or per the maker's PMS |
|---|---|
| Seal barrier system check | daily to weekly during operation |
| Anode inspection/renewal | at drydocking or per condition, typically every 2.5-5 years |
| Underwater housing/propeller inspection | per the maker's approved underwater service procedure, which is this unit's key feature relative to drydock-only designs |
| Hydraulic filter/oil change | typically every 2000-4000 running hours per the maker's PMS |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
Class surveys steering/thruster systems at drydocking or via an approved alternative survey arrangement; for underwater-mountable designs, class may accept in-water inspection/maintenance records in lieu of a drydock opening where the maker's service procedure and class's alternative survey approval cover it - confirm the specific approval basis with the vessel's class society.
Estimated lifetime: Underwater-mountable steerable thrusters of this power class are typically designed for 20-25+ years of service with periodic seal, gear oil and anode maintenance; the underwater-serviceable design is intended to reduce drydock dependency for routine maintenance rather than change the underlying overhaul intervals of the gear train.
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