How to remove lock washer on dolly wheels?
You need to remove the wheel to service the blade on a push mower.
Lawnmower manufacturers use screw-on nuts, lock washers and retaining pins to secure mower wheels. Occasionally, it becomes necessary to remove a wheel, perhaps to change it or in the case of a reel mower, to sharpen the blades. If the wheel is held by a lock washer, you won't have much trouble removing it unless the mower is rusted and corrosion is locking it to the axle. In that case, it may take a little lubricant and some pounding. You may have to remove a hubcap to get to the washer.
Jack up the lawnmower on a car jack to get the wheel off the ground, if you're servicing a riding mower.
Disconnect the spark plug or if the mower is electric, unplug it.
Pry the plastic hub cap off, if there is one, using a flathead screwdriver. Depending on the style, it may be easier to grip the cap with adjustable pliers and pull it off.
Work the tip of a flathead screwdriver into the notch between the lock washer -- which is actually a C-clip -- and the axle. Rotate the screwdriver to pry the clip off.
Spray lubricant on the washer if it's corroded. Wait five minutes, then try again to pry it off. If that doesn't work, tap the screwdriver with a hammer. The combination of tapping and lubricating should loosen it, although it may take one or two more applications of lubricant.
Remove any other washers that are between the lock washer and the wheel and put them in a safe place, then slide off the wheel.