Rotary Vane Steering Gear · Steering Gear
The Thordon RiverTough / Composite is designed to enhance durability and reliability in marine hydraulic systems. Featuring a rotary vane pump with composite bearings, it operates efficiently using hydraulic oil as its medium. Regular maintenance includes hydraulic oil analysis every six months and inspecting the flap seals during docking. Notable service failures include internal bypass issues due to leakage at the rotary vane seal, motor bearing wear after 30,000 hours, magnet valve clamp damage from contaminated oil, and drift in the rudder position feedback system. To ensure quick repairs, Thordon Bearings Inc. recommends keeping a spare kit and solenoid valves on board, with an estimated lead time of 3-8 weeks for replacements. Monthly drills should be conducted to test the standby control systems. The SOLAS Hard-Over Test is required every 28 seconds as part of standard maintenance procedures.
What our service work and the manufacturer documentation say about keeping this model running.
Hydraulic oil analysis every 6 months. Blade seal inspection at drydock. SOLAS hard-over test (28 seconds). Emergency steering drill monthly.
Thordon Bearings Inc.: Keep a seal kit and solenoid valves on board. Lead time: 3-8 weeks.
Listed in the DNV Approval Finder at the time we recorded it. The certificate is issued by DNV, not by us; check its current status at DNV.
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