How to Change a Wheel on a Bench Grinder

What You'll Need
Safety gloves
Adjustable wrench
Lubricating oil
Replacement wheel

As with most tools with moving parts, a bench grinder sometimes require these parts to be replaced in addition to general maintenance. This particular piece of equipment has an additional benefit of being capable of use for several purposes. This can result in the wheel needing to be changed on a regular basis, making it helpful to know how to do it yourself rather than seeking assistance on every occasion.

Step 1–Safety First

Before doing anything else, ensure that the bench grinder is disconnected at the mains. If it has a back-up source of power, make sure that this is also switched off. If possible to do so, remove the power lead entirely so that it does not cause an obstruction.   

Step 2–Understand the Tool

It is easy to overlook the inner workings of any tool that you know how to use. Nonetheless, a little study of the machine can make the task of changing the wheel much easier. Examine the mechanism of the bench grinder to understand how it works and which part of it requires replacement.

If it has been retained, peruse the manufacturer’s instruction manual. This should outline full details of how to safely remove and replace the wheel.     

Step 3–Remove Any Obstruction

Many bench grinders will have a safety guard, which will need to be taken off to allow a clear path to remove the wheel. Locate the screws that attach it to the main body of the machine and carefully remove them by using the appropriate screwdriver, according to the type of screw head. Remove the safety guard completely rather than twisting it out of the way.    

Step 4–Remove Wheel

Locate the drive shaft of the bench grinder and, using the wrench, loosen and remove the nut and washer that secures the wheel. Carefully set them aside so they do not go astray. Place a small amount of oil on the joint of the shaft and the nut if it proves stiff. Make use of the gloves to protect your hands as you remove the wheel.  

Step 5–Position New Wheel

Replace the new wheel in the same manner that the old one was positioned. Depending on the type of wheel you are mounting, you may need to ensure that you place it the right way round. Slide the wheel to the furthest position it can go, the same as the previous wheel, and replace the nut and washer. Use the wrench to tighten the nut back into place. Take care not to use too much force, as the nut will automatically tighten when the wheel is in motion.

Step 6–Test

Test the replaced wheel by switching it on and watching and listening carefully for any unusual movement or sound. If you notice a wobble or whirring noise that isn't normal, switch off the machine at the mains again before rectifying the situation.

Once it is working at it should, turn it off at the mains before replacing the safety guard.