How To

How to Change the Lawn Mower Blade?

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A perfectly maintained lawnmower works with sharp knives, which are essential for a velvety-smooth lawn carpet. In spring, therefore, check the lawnmower knife to see whether it is blunt and it makes sense to change it. These instructions explain step by step how the exchange works.

How often should lawn mower blades be changed?

There is no firmly cemented schedule for replacing lawnmower blades. The intervals at which the knives are to be changed rather depend on various factors. The degree of stress is just as much a part of this as the maintenance effort or the quality of the winter quarters. If a commercial lawn mower renews the cutter bar every 4 months, this can only make sense for a private lawn owner every 1 to 2 years.

In this question, act according to the rule of thumb: Blunt lawn mower blades change before the first lawn cut in spring. This premise applies equally to electric, cordless and petrol lawnmowers.

Material, tools and preparatory work

Safety has a top priority when changing a lawnmower knife. When buying, make sure that the new cutter bar is suitable for your model. If the knife and lawnmower do not match, considerable damage is inevitable. You will also need a wrench and work gloves. How to prepare the replacement of the knife properly:

  • Electric mower: pull the power plug
  • Cordless mower: Remove the batteries
  • Petrol mower: Pull out the spark plug cable, close the petrol tap and tilt the carburetor upwards

It is beneficial to have a helping hand to hold the lawnmower when you loosen the screws and replace the knife.

How to replace lawn mower blades correctly – Instructions

If you have taken all the safety precautions, you can fully dedicate yourself to changing the lawnmower blade. How to proceed professionally:

  • Fix the cutter bar with one hand or a piece of wood or a knife blocker
  • Use your other hand to loosen the screw with washer and set it aside ready to hand
  • Pull out the knife by turning it slightly and place it at a safe distance
  • Place the new cutter bar flush on the screw opening and hold it there

Finally, screw in the screw together with the washer and tighten well. Please hold the knife with one hand while turning the wrench with the other hand.

After replacing the knife, put the lawnmower back on its wheels. On the petrol mower, put the plug on the spark plug and open the petrol tap. Insert the accumulator in the cordless mower.


Are you on the lookout for a lawnmower that makes no noise, always works with sharp knives and produces an English lawn? Then we would like to recommend a modern cylinder mower to you. This type of lawnmower is operated manually, cuts the blades in a silhouette and has self-sharpening knives.

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