- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Raise the mower high enough that you can reach the nut that holds the blades. Remove the wires from the spark plugs so the engine can't start. Jamb the blade with a piece of 2x4 so it won't turn while loosening the holding nut. Remove the nut but keep track of the location and the direction of any washer that may be there. Some washers are cupped so make sure you know which way the cup goes. Then remove and replace the blade. Make sure you get the nut tight enough. You will need to jamb the blade again so you can tighten the nut. This is a good time to scape it clean under there too.
I use a putty knife and sometimes a wrecking bar to clean the underside.
Lots of saws have left hand threads on the nut that holds the blade in place. It is designed so that if the saw starts up and the nut isn't snug, the nut and the blade slipping on the turning arbor would tend to tighten the nut as they slip against the force of the spinning arbor.
1. Unplug the saw.
2. Hold on to the blade tightly with one hand.
3. Put the wrench on the arbor nut and turn it in the direction you would turn it as if the wrench were turning the blade to cut wood.
If you've previously overtightened the blade, jamb a piece of wood against the teeth and the saw table top and then follow step 3.
If the motor is on the left side of the blade as you face the saw, then it's a standard right hand nut.
If the motor is on the right side of the blade as you face the saw, then its a left handed nut.
UNPLUG THE SAW first!! Look for the blade lock on the top or front of the motor body, Hold the lock button down while turning the blade nut with a wrench. After a bit you'll feel the lock button engage and hold the blade firm. Rotate the the wrench counter clockwise and remove the nut, Slide the blade out from under the guard and replace with a new one. Reinstall the nut following the above procedure.
There are two nuts up by the blade that will be removed to get blade off also there is a small screw next to the blade itself on the opposite side. You must loosen 2 big nuts then back this small screw off a few turns will be inside a small hole near blade. Once blade chain is loose take nuts off drop blade replace do everything now in reverse.
With the saw unplugged -
The blade needs to be locked in place so it will not turn when you put a wrench on the nut located on the left side of the blade that holds the blade on. This is done with a locking pin on the right side of the blade. Push the pin in and rotate the blade by hand until the pin locks into the blade and prevents it from moving. With the pin pushed in put a wrench on the large nut on the left side of the blade and turn it. This may be reversed threaded, so you may have to turn the nut clockwise in order to loosen it.
When tightening the nut after replacing the blade, you will have to once again lock the blade with the same pin.
Perhaps this video will help you locate the locking pin.