The lubricating oil system supporting the...

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Question 1 of 2066636eef28f7522a1c51fddc

The lubricating oil system supporting the main propulsion reduction gear on the harbor tug to which you are assigned is fitted with a lube oil strainer as shown in the illustration. Which of the following maintenance actions is performed most often in terms of frequency? Illustration MO-0057

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Question 1 of 20

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🔍 Key Concepts

• Function of a continuous-duty lube oil strainer in a propulsion reduction gear system • Difference between routine/operator checks and periodic maintenance/overhaul actions • How each labeled part (A, B, C, D) is used based on the oil flow and accumulated sludge shown in the illustration

💭 Think About

• Look at where the sludge is collecting and how the arrows show oil flow. Which action would an operator be expected to do regularly while the system is in service to keep flow unobstructed? • Which actions would realistically require shutting down the system, isolating, and opening the housing—and therefore would be done less often, maybe during planned maintenance? • Compare which option can be done quickly from outside the housing versus which require disassembly and draining.

✅ Before You Answer

• Identify which component(s) can be operated without disassembling the strainer or removing oil from the housing. • Decide which option is clearly a daily/operational task versus a periodic/overhaul task. • Use the illustration to confirm which choice involves simply moving a handle versus removing covers, elements, or the sump.

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