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Hydraulic bow thrusters


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A hydraulic thruster power system is a closed loop and should not need regular topping up, it must be losing fluid somewhere, it's not like a brake system where the fluid in the reservoir is displaced by the wear on pads or shoes and needs topping.

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I've no experience of maintaining these things but I'd tend to agree with post 2 above. The only time I've used one was when moving a friends boat.

 

However, apart from the wash, the only indication you are using the thing is the slight cough the engine gives. Much more subtle than the 'orrible screeching noise the electric jobbies make.

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Any topping up means a visible leak, check hose runs for chaffed pipes - pinholes and any leaking fittings. If the motor is in a damp area then the shaft may have rusted by the seal causing the seal to wear/fail. Check the motor for leakage. Depending on the motor type this can be resealed. Via my work I have done this for submerged prop drive motors, but they do not last long. How does the motor connect to the bow thruster prop? Can you provide any pics or more detail?

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