How do I adjust the cutting height on my Sun Joe Mow Joe MJ408E Lawn Mower? Power down and unplug the lawn mower. Remove and empty the grass bag. Use the lever to adjust the cutting height of your unit to one of 7 positions available. Re-attach the grass bag. Plug back in your mower and resume normal use. Related articles How do I adjust the cutting height on my Sun Joe Mow Joe MJ401C-XR Lawn Mower? What are the 7 height adjustments on the 21-inch Mower? How do I properly operate my Hover Mower? New Charger will only have two Prongs (24VCHRG-QC) How should I maintain and care for my Lawn Sprinkler?