Tunnel Thruster · Bow/Stern Thrusters
Thrustmaster of Texas, Inc. TH200MLR — Retractable tunnel thruster (electric motor-driven) for bow/stern docking, slow speed maneuvering, emergency steering, station keeping with azimuth propulsion.
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| Gear oil change | typically every 1,000-2,000 running hours or annually |
|---|---|
| Shaft seal inspection | annually; renewal typically every 2-5 years depending on running hours |
| Anode renewal | annually or at drydock, condition-based |
| Motor insulation resistance test | annually |
| Full unit survey/overhaul | typically aligned with drydock intervals (roughly 2.5-5 years) |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Shaft seal leakage | renew once continuous drip exceeds the maker's allowable rate - confirm against the unit manual |
|---|---|
| Gear oil water content | renew if water contamination is clearly visible or lab result exceeds the maker's threshold |
| Motor insulation resistance | investigate if reading falls well below general industry guidance for the winding class - confirm the exact limit against the motor manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Bow/stern thrusters are typically under Continuous Machinery Survey; class expects gear oil sampling and insulation resistance records, plus confirmation the retraction mechanism operates and locks correctly at survey.
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