When the mower is new, the engine and various moving parts have not been fully running-in. Because the moving parts still have machining marks. If it is used without run-in, the friction surface will be severely worn and the service life of the engine and other parts will be shortened.

Before running in, first fill the lawn mower with oil and gasoline. Tighten all fixed parts to ensure good technical condition. Start the engine, make the engine run at a low speed for 10 minutes, increase the throttle and run for another 10 minutes, then make the engine run at a high speed for 10 minutes, reduce the engine speed and engage the cutter, and gradually reach a high speed running for 30 minutes from the medium speed. Finish the early run-in.

The machine running-in work should be combined with the test cutting, after the completion of the preliminary running-in, the grass cutter should be comprehensively inspected and adjusted before the test cutting.