How do you drain and fill gear box of a rear tine tiller?

To drain and fill the gearbox of a rear tine tiller, first, locate the drain plug at the bottom of the gearbox and remove it to let the old oil drain completely into a container. Once drained, replace the drain plug and locate the fill plug, usually on the side of the gearbox. Use a funnel to add the appropriate gear oil until it reaches the recommended level, typically just below the fill hole. Finally, securely replace the fill plug to complete the process.