Which type of lubricant is recommended for normal motor applications with sleeve bearings?

The recommendation of using 20 weight motor oil for normal motor applications with sleeve bearings is based on its optimal viscosity properties, which provide an effective balance between lubrication and operational efficiency.

When a motor operates, its bearings generate heat and experience friction. The viscosity of the lubricant is crucial as it affects how well the lubricant can flow and cover the surfaces within the bearings. A weight of 20 provides sufficient thickness to reduce wear and protect the bearing surfaces while still allowing for good flow at operating temperatures.

Using a lubricant that is too thick, such as 30 or 40 weight motor oil, can lead to inadequate lubrication during start-up due to greater resistance to flow, and it may also increase the load on the motor, potentially leading to overheating or premature failure. Conversely, a lubricant that is too thin, like 10 weight motor oil, might not provide enough protection against wear under higher load conditions, especially if the motor is subject to varying operational demands.

Thus, the choice of 20 weight motor oil is aligned with the necessary lubrication requirements for sleeve bearings, ensuring reliable performance and longevity of the motor's components.