This article will cover the soft fixes you can take if your petrol lawnmower is excessively vibrating.


Excessive vibration is normally caused by a blade strike:

  • The engine may stop suddenly if the blade comes into contact with a tree root, drain cover or paving slab


Blade adaptor:

  • The cast aluminium blade adaptor may have taken most of the force of the impact in order to prevent further damage to the engine.
  • If the blade adaptor has snapped, a replacement part is required.
  • Cracked or chipped adaptors with one or both shear pins missing should be replaced before continuing use.


  • In more serious cases the blade itself may have dented, be deformed or may have snapped.
  • You will be able to see if the blade has deformed from the asymmetry of the blade.
  • If either the blade is deformed, dented or snapped a replacement is required.

Bent crank shaft:

  • The worst damage that can result from a blade strike is the bending of the crank shaft.
  • If this has happened, then the drive shaft will be oscillating instead of rotating.
  • To check this: rotate the blades by hand to see how the crank moves.
  • The engine will need to be totally replaced.

**In the unlikely case that there is no visible damage to the crank shaft, blade or blade adaptor, and there still is excessive vibration, then please contact us by email or via our helpline, and we can advise you further. Alternatively, please take the machine to a local garden machinery centre for assessment and repair**