Consider the following issues comprehensively：
- Whether the gear material meets the requirements
- Whether the accuracy of gear machining meets the requirements, so it is necessary to conduct a comprehensive inspection of the gear parameters, tooth profile, tooth direction and root scanning
- Whether the bearing is qualified
- Hardness of root after heat treatment
- Whether undercutting occurs
Possible conditions of gear wear：
- Material problems
- Heat treatment problems
- Incorrect machining tooth shape
- Partial load
- Overload or insufficient strength
- Poor lubrication
The main causes of gear damage can be roughly divided into: wear; pitting, peeling, carburizing layer fragmentation; fatigue; impact; corrugation, arris and cold deformation. Most gear damage is due to excessive gear load, or shock or shock loads caused by incorrect shifting or clutch operation. If there is a defect in a gear, it can only be determined by metallographic examination.