Mounting method of mixer truck speed reducer

The invention discloses a mixer truck speed reducer mounting method, which relates to the technical field of special automobile manufacturing, and comprises the following steps: directly mounting a speed reducer when a hanging tank is arranged on a support; cutting off lifting lugs of the tank body; welding of the whole upper part is completed; before the whole upper assembly welding is completed and sanding is carried out, a shielding bandage is used for winding an installation movable section between the speed reducer and a tank body flange, so that the periphery of the installation movable section is completely wrapped by the shielding bandage, and then a shielding cover is used for covering the whole speed reducer to carry out all-directional protection on the speed reducer; the upper part is pushed into a sanding room for sanding and paint spraying; after sanding and paint spraying are completed, sand grains on the shielding cover of the speed reducer are removed through an air pipe, and the shielding co