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When height adjustment lever is all the way forward the blade is 1/2 inch from the ground. Blade is lowered approximately 1/4 inch for each notch in the height adjustment index. 3. Push edger forward slowly, adjust pace to engine’s capacity. 5 Maintenance CAUTION: To prevent injury from rotating parts turn engine stop switch to OFF and disconnect spark plug wire from engine before attempting any maintenance. Changing Engine Oil Oil should be changed after first 20 hours of use and then aft