If all the bearings in a rear axle assembly are badly worn and discolored, which technician is correct about the cause?

When evaluating the condition of the bearings in a rear axle assembly, they may exhibit signs of being badly worn and discolored due to several factors, often linked to lubrication issues or excessive load. The technician who identifies that a lack of proper lubrication is likely to blame for the deterioration is correct. Bearings rely heavily on a consistent supply of lubricant to minimize friction and heat buildup. Without adequate lubrication, metal components can wear down rapidly, leading to discoloration and significant wear on the bearings.

Additionally, the wear patterns and discoloration may indicate that the bearings have been operating beyond their design limits, or that contaminants have been introduced into the lubrication system. Such conditions can also contribute to bearing failure, supporting the notion that proper maintenance and inspection of the lubrication system are crucial for preventing such issues. This understanding underscores the importance of regular maintenance checks and timely oil changes in preserving the integrity of a vehicle's drivetrain components.