With the mower still on its side grab your socket wrench and wood block. Place the block inside the blade well. This is to prevent the blades from turning while you loosen their bolts. Remove the blade mounting bolt/bolts. A typical mower will have one blade like the Craftsman 37700 I serviced for this guide (one mounting bolt). Some like my Honda HRR216VKA have two blades an upper and a lower (two mounting bolts). Each blade should have at least two cutting edges.
Lawn mowers are tough. Like any machine though they need regular maintenance to run their best. Worse neglect can cause a mower to fail completely. So before the summer mowing season really kicks into high gear prep your mower right. From cleaning it to changing the oil to sharpening and balancing its blades this guide lays out steps to get your mower and your garden in tip-top shape.
Some lawn mowers such as the Craftsman 37705 have a washout feature. It is essentially a garden hose fitting on top of the circular blade cover. This allows you to pump water into the blade assembly while running the engine. That action is designed to flush dirt and grass debris right out.