The lawnmower has not been fully run in the new engine and its running parts. There are still processing marks in the running parts. If used without running in, the friction surface will be seriously worn down, and the service life of engine and other components will be shortened.

Before running in, first fill the lawn mower with oil and petrol. Fastening various fixed parts to ensure the technical condition is in good condition. Start the engine, make the engine run at low speed for 10 minutes, increase the throttle for 10 minutes, then make the engine run for 10 minutes at high speed, reduce the engine speed joint cutter, and gradually reach the speed of 30 minutes from medium speed. Finish the early stage of running in.

The machine running in should be carried out in conjunction with trial cutting. After the completion of the operation, the grass cutter should be inspected and adjusted before it can be tested.