This paper analyses on the main reasons of the "track biting" of cranes running gears, and puts forward some measures for adjustment and repair.

The technical levels of the metro bogies at home and abroad are investigated. The design scheme of new metro bogie is put forwarded based on the practical applications of domestic running gears.

During the simulant test of gears running - in, the wear type of samples are changed. The rules of the variety are gained.