Based on dust removal fan plug and reversed loader off tracking problem in MK5 mining machine, the reason was analyzed, the technical reformation was put forward. Plugging the original exhaust opening and welding new exhaust opening connected to the original air duct was adopted to solve the dust removal fan plug, specially designed belt transfer machine preventing off tracking was adopted to solve reversed loader off tracking. The practice showed that MK5 mining machine after transformation was with less fault and maintenance costs.