The general purpose supply boat to which you are assigned is equipped with airflex pneumatic tire friction type propulsion clutches. If it is required to replace a clutch friction shoe, what statement is true?
• Friction-type propulsion clutches and how uneven wear can affect operation • Manufacturer’s recommendations for replacing wear components in sets vs individually • How balance, engagement smoothness, and heat distribution depend on having similar friction characteristics among all shoes
• If only some shoes are new and others are worn, how might this affect clutch engagement, shock loading, and vibration? • Think about what is usually recommended for other circular wear items (like brake shoes or tires): are they replaced singly or in matched sets, and why? • What practice would best protect the gearbox and propulsion system from uneven loading over time?
• Check whether uniform contact and equal friction around the entire clutch is important for smooth torque transmission. • Consider if the most conservative option is generally preferred in exam questions when dealing with critical propulsion components. • Ask whether any option would allow a mix of very old and very new friction surfaces in the same clutch, and if that could lead to uneven wear and performance.
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