🔍 Key Concepts

• Identify the type of device shown (oil purifier / centrifugal separator bowl with disc stack). • Normal maintenance steps when excessive sludge is present in a purifier bowl. • Manufacturer guidance about handling discs, gaskets, and lubrication points during major cleaning.

💭 Think About

• Given that sludge is excessive, is this a minor in-place cleaning or a more thorough teardown job? • Which components are normally considered wear items (to be inspected and possibly replaced) versus precision-balanced parts that should not be randomly swapped out? • How important is it to preserve alignment and match marks when reassembling a high‑speed rotating bowl?

✅ Before You Answer

• Verify which answer choices talk about cleaning all components versus only some internal parts. • Check which options recommend replacing defective gaskets vs defective discs, and think about which is more realistic and economical in routine purifier maintenance. • Ensure the chosen procedure maintains the bowl’s balance and correct reassembly (use of match marks, dowel pins, or alignment features).