Blade Boss Removal

Learn How to more easily remove the blade boss from a lawn mower.

Tools/Parts Required 

  • Two Jaw Puller
  • Bolt or Cylindrical Picec Of Metal
  • Socket (To fit size of Two Jaw Pullers
  • Pipe Wrench or Locking Pliers

Step 1.

Place bolt/piece of metal into the hole in the middle of the boss. Ensure that the diameter of the bolt/metal doesn’t exceed the size of the hole (it needs to sit inside).

Step 2

Align the two jaw pullers with the end of the bolt/metal and hook the pullers onto the boss.

Step 3

Attach the socket onto the two jaw pullers and tighten them in order to remove the boss. (hold the shaft with a pipe wrench/locking pliers if it is spinning).


  1. Im replacing the motor and need to fit the boss to the new motor, very reluctant to use a hammer to fit to new crankshft. any suggestions?

    • Fitting the boss to a new motor should be relatively easy if both surfaces are clean, If you don’t want to use a hammer you can use a rubber mallet, Or you could use the blade carrier & nut to tighten the boss down, You would need to fill up the combustion camber with starter rope or a rag to stop the engine rotating while you did this.

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