Why the Drive Pulley Bearing Fails: A Maintenance Case Study
Explore the causes and solutions for drive pulley bearing collapse in open-pit coal mining.
Technical Summary
This case study examines the failure of a drive pulley bearing on a CAT 992K Wheel Loader at an open-pit coal mine. The failure resulted in a 5-day downtime and an estimated cost of €15,000.
Component Function
The drive pulley bearing supports the conveyor belt system, allowing for smooth operation and efficient material transport. It is critical for maintaining the tension and alignment of the conveyor.
Failure Mechanism
The bearing collapsed due to excessive load and insufficient lubrication. Over time, the lack of proper lubrication led to increased friction and heat, ultimately causing the bearing to fail.
Root Cause Analysis
The root cause of the failure was traced back to inadequate lubrication practices and the operation of the conveyor system beyond its designed load capacity. Regular inspections revealed that lubrication intervals were not adhered to.
Prevention & Corrective Actions
To prevent future failures, a strict lubrication schedule was implemented, along with regular load monitoring. Training sessions for operators on load limits and maintenance practices were also conducted to ensure compliance.
Prevention
Regular lubrication schedule and load monitoring to ensure compliance with specifications.