Replacing lawn mower blades, how much torque?

When you are replacing mower blades, how much torque do you use to tighten them on? That is a great question that was asked on the Gopher Lawn Care Business Forum. It’s something everyone is going to need to know yet probably most aren’t really sure how to answer.

The lawn care business owner wrote “I decided to replace my new mower blades myself this time. Is there a torque that is good for the bolts on the blades?

Changing lawn mower blades

Changing lawn mower blades

I am not expecting an exact number, but is there a good general number that is in use? The mower is an 07 Ferris Z-turn 44″ deck with 3 blades. Or should I just use an airgun and make it reasonably tight?”

Another member responded by saying “the basic rule is to use an impact gun to take the mower blades off… But never to put them on. There is usually no way to gauge the ft. lbs. on an impact gun. You can damage the spindles by accidentally cross threading among other things.

I have always put my blades back on just using my 24mm 1/2 socket and drive. You may have to hold the blades…put on a glove or use a wooden block. I never over tighten them either…1/4 turn past stop will do.”

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