Apply some GOOD rust penetrating oil, like PB Blaster or Liquid Wrench to the affected area. Let the penetrant do it's work by allowing it to soak into the parts. 24 hours is long enough. A pre-cleaning with a stiff steel wire brush is recommended though, so the penetrating oil can work better. Some people heat rusted parts after treating them to break them loose. Most mower blades are installed on a blade adapter that slides onto the bottom of the crankshaft of the mower. Try NOT to round off the heads of the blade bolts. Patience is the key. Impact sockets may have to be used on the bolts if they are extremely stubborn. Use tools that offer absolutely no slack or play in them when put on the blade bolts.
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Apply some GOOD rust penetrating oil, like PB Blaster or Liquid Wrench to the affected area. Let the penetrant do it's work by allowing it to soak into the parts. 24 hours is long enough. A pre-cleaning with a stiff steel wire brush is recommended though, so the penetrating oil can work better.
Some people heat rusted parts after treating them to break them loose. Most mower blades are installed on a blade adapter that slides onto the bottom of the crankshaft of the mower. Try NOT to round off the heads of the blade bolts. Patience is the key. Impact sockets may have to be used on the bolts if they are extremely stubborn. Use tools that offer absolutely no slack or play in them when put on the blade bolts.