Concrete Saw: Engine Rotates but Blade Doesn't
If the engine in your concrete saw is rotating, but the blade is not, check the belt, clutch and clutch drum. This is a common symptom that you can fix on your own with the help of our troubleshooting guide. This is meant to be a general guide for your DIY repair. For more detailed information on your specific model, please refer to your owner's manual.
Belts
The belt transmits power from the engine to the saw blade. Should this belt fail, it will no longer be able to transmit power. To replace the belt, remove the starter, or the belt cover (depending on how your saw is set up), and take off the belt cover on the blade side. Relax the tension on the belt by turning the tension nut counter clockwise until its stops. Walk the belt off the blade pulley by turning the blade with your hand. Continue to take the belt off the clutch pulley by turning the clutch drum. Clean out the grooves on both pulleys. Slide the new belt on the clutch pulley and spin the clutch drum around to walk the belt on the pulley. Insert the belt on top of the blade pulley and turn the blade around, walking the belt on the pulley. Turn the belt tension nut clockwise until it stops and reapply the tension to the belt. Reinstall the belt cover and starter. ... Read more
Drums
See “clutch replacement” as replacing the clutch includes replacing the drum. For a proper repair, you should always replace the drum with the clutch. By changing just the drum, it is only fixes it half way. There is no reason to pair up old, semi-worn shoes with a brand new clutch. You will find yourself doing this job shortly again after by replacing the drum.
Clutches
The clutch transmits power from the engine to the drive shaft using centrifugal force. As the engine speeds up, the clutch rotates faster, locks in position and transmits the power. When the clutch is burned out, it will usually have a burning smell and start to slip. At this point, it needs to be replaced.
The following procedure is going to vary slightly on all models. To prevent accidental start up, begin by removing the spark plug wire and the spark plug. Depending on your model, take out the starter, or clutch cover, and remove the belt cover. Release the tension on the belt by turning the tension nut counter clockwise until it stops. Walk the belt off the clutch pulley by turning the clutch drum. Rotate the fly wheel to get the piston to the bottom, dead center. Stick a small screwdriver down the spark plug hole to feel for the piston at the bottom. Insert a rope, or cord, in the spark plug hole to ensure the piston stays in the downwards position. Clear any clips on the crankshaft, in front of the clutch.
Using a clutch removal tool, take out the old clutch. Some clutches have an ar that indicates the direction of removal, which is normally clockwise. Take out the old clutch and pull out the clutch drum. Clean the crankshaft and install the new clutch drum and ring spacer. When installing the shoes part, ensure it is put in correctly. It should say “top” on the side facing outwards.
Now, using the clutch removal tool, tighten the new clutch in position. Take out the cord, or rope, from the cylinder. Reinstall the belt by walking it back on the pulley and reapply the tension on the belt by turning the tension nut clockwise until it stops. Reinstall the belt cover and the starter or clutch cover. ... Read more
The following procedure is going to vary slightly on all models. To prevent accidental start up, begin by removing the spark plug wire and the spark plug. Depending on your model, take out the starter, or clutch cover, and remove the belt cover. Release the tension on the belt by turning the tension nut counter clockwise until it stops. Walk the belt off the clutch pulley by turning the clutch drum. Rotate the fly wheel to get the piston to the bottom, dead center. Stick a small screwdriver down the spark plug hole to feel for the piston at the bottom. Insert a rope, or cord, in the spark plug hole to ensure the piston stays in the downwards position. Clear any clips on the crankshaft, in front of the clutch.
Using a clutch removal tool, take out the old clutch. Some clutches have an ar that indicates the direction of removal, which is normally clockwise. Take out the old clutch and pull out the clutch drum. Clean the crankshaft and install the new clutch drum and ring spacer. When installing the shoes part, ensure it is put in correctly. It should say “top” on the side facing outwards.
Now, using the clutch removal tool, tighten the new clutch in position. Take out the cord, or rope, from the cylinder. Reinstall the belt by walking it back on the pulley and reapply the tension on the belt by turning the tension nut clockwise until it stops. Reinstall the belt cover and the starter or clutch cover. ... Read more