🔍 Key Concepts

• Difference between splash, spray, and pressure lubrication systems • Typical lubrication needs of medium-speed main propulsion reduction gears (high load, continuous duty) • How gear tooth contact at the mesh is best protected under heavy load

💭 Think About

• Think about which method would most reliably deliver a continuous film of oil exactly where the teeth mesh under high torque and varying speed. • Consider which methods might be more common on small, slow-speed, lightly loaded machinery versus large ship main propulsion reduction gears. • Ask yourself which method would best control oil temperature, cleanliness, and pressure, all critical for expensive reduction gears.

✅ Before You Answer

• Eliminate any option that relies mainly on random splashing or passive pickup for a heavily loaded main reduction gear. • Focus on options that can provide controlled flow and pressure of oil to the tooth contact area. • Check which method is most consistent with having filters, coolers, and positive circulation in a main reduction gear lube oil system.