What is the micron rating of the LO strainer basket?

• A. 40 micron
• B. 10 micron
• C. 60 micron
• D. 80 micron

Answer: (A)

Micron rating tells you the size of particles the strainer is designed to remove from the lubricant flow before it reaches critical components. For the LO (lube oil) strainer basket, the goal is to trap debris that could cause wear, without unduly restricting flow. A 40 micron rating is used because it provides a good balance: it captures particles around 40 microns and larger, protecting the pump and bearings, while still allowing smaller contaminants to remain suspended so the system doesn’t clog too quickly. A much finer rating, like 10 microns, would clog more easily and raise pressure drop, while a coarser rating, such as 60–80 microns, would let larger debris slip through and risk damage. Thus, 40 microns is the typical and appropriate choice for the LO strainer basket.