In order to solve the frequent malfunction of lime generation device in the lime milk preparation system which leads to large maintenance work and high production cost,Zhongyuan Gold Smelter introducedφ1.3 m×5.0 m lime digestion.However,during the operation of the equipment,the riding wheel drive system often incurs seizure and thus the system wears.To ensure production sustainability,the system is renovated.The renovation plan is that the previous riding wheel system is cancelled and the sliding bearing is replaced by rolling bearing structure.The tapered roller bearing is selected,the fit is heavy load light force fit; riding wheel bearing and riding wheel are connected by interference fit bond,positioned by oil retainer and adopt double positioning structure; the bearing pedestal is designed a split structure; the bearing is lubricated with dry oil cup.After renovation,the system operates smoothly and reliably,the lubrication is good.The equipment saves cost and improves economic benefits,and can be used as reference by similar companies.