Tunnel Thruster · Bow/Stern Thrusters
The Niigata Marine NIG‑TT‑3500 is a high‑power stern tunnel thruster delivering up to 420 kN of thrust through a 3.3 m diameter duct, designed for large vessels that need strong low‑speed maneuvering assistance.
What our service work and the manufacturer documentation say about keeping this model running.
Inspect propeller and tunnel or retractable housing when accessible, seals, gearbox or bearings, lubrication, motor or hydraulic drive and control feedback. Review vibration, oil condition, temperature and thrust response. Test bridge and local control under an approved manoeuvring procedure. Refer to the manufacturer documentation for the exact figure for lubrication, clearance, electrical and wear limits.
Carry seals, filters, approved lubricant, motor-control or drive spares, feedback sensors and critical hydraulic, steering or electrical components.
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