The flywheel shell structure of the engine after taking force comprises the flywheel shell body after taking force, after taking force mounting plate, spline drive shaft, after taking force mounting plate is designed with customer hydraulic pump mounting hole, after taking force mounting plate four corners have four hydraulic pump fixing hole; The front end of the customer hydraulic pump installation hole with a ring and the drive hole on the main body of the flywheel shell after the force matching, and inserted into the drive hole; A connecting hole is arranged around the mounting hole of the customer hydraulic pump on the rear drawing force mounting plate and the main body of the rear drawing force flywheel shell. The connecting hole is connected with the main body of the rear drawing force flywheel shell through a screw. Force of the utility model after mounting plate can be directly connected to the force of the existing after the flywheel shell body, and then end can according to customer's different interfaces to design the hydraulic pump mounting holes is not the same customers, provide customers' needs, a new type of flywheel shell from can shorten the development cycle and cost, so as to realize customers drive the hydraulic pump.