Table Saw Bearing Replacement

A few months back I noticed my table saw was sounding a little ill. It was louder than usual. It had trouble getting through boards that normally didn’t give it pause, and the blade would come to a stop a short few seconds after turning off the power. I had a bearing problem somewhere.

I pulled the belt off between the motor and the shaft that runs the blade (called the arbor shaft). Turning the motor on, it spins freely and takes a while to slow down. Trying to turn the arbor shaft by hand is quite difficult. Well that was a fairly easy diagnosis. Now how to fix it. Matthew Cremona made a short video demonstrating his journey of replacing the bearings in this saw. (Ridgid R5411 Table Saw purchased in September 2009) He does a good job of showing what everything looks like, but some of the technique could be improved.

Step one is to remove the table top. Remove the blade and lower the arbor all the way down (sad story about that later). There are 4 bolts around the perimeter that hold the granite beast down. Remove them and walk the table top off onto a surface of similar height. This will expose the arbor shaft. There are two big bearings (6004zz) located here (under each red arrow), one of them is likely the culprit.

Now that everything is open I would suggest some lubrication. PB blaster is pretty well rated and available at a lot of auto parts stores. Spray everything that will need to slide and come back in a day or two. That stuff can creep into places for days. Raise the arbor back to the top, remove the pulley and use a block to push out the shaft like Matthew shows. I used a really big dowel to hammer out the bearing that gets left over (left side in above picture). What I ended up with was this below.

That right most bearing is tricky. It has to slide off of its resting surface, and the one for the left most bearing. Lube helps a lot, and so does the right tool. I picked up a cheap bearing splitter kit and am glad I did. There isn’t much room between the bearing and that flange that goes against the blade. The splitter wedged itself between the two and started the bearing moving towards freedom.

The big red vise from a few weeks ago is going to come in handy now! Next I installed the rest of the hardware to start pulling up on the bearing. The extensions were not long enough. Thankfully they were 1/4″-20 threads. I cut up some threaded rod I had around and got to work.

With two adequate threaded rods installed a double fork thing hooks in and has its own threaded center to push on the shaft. A socket wrench helps provide some umph.

Careful application of force was all it took to take everything completely apart. Here is what it looks like with all the bits fully disassembled. The right most bearing was very much seized.

I broke out my new bearings (6004zz) and was a little disgusted. They had surface rust on the outside races. Both sets were individually sealed, but still had rust.

They were all I had and a little fine scotch bright pad took it right off. I used light sanding to make a lead in chamfer on all the bearing surfaces to help with initial seating. I hammered the right bearing back into place using a piece of 3/4″ PVC pipe. Most 3/4″ pipes should do, always apply load to the race you are seating. Inner in this case. The left bearing went back in with a parallel clamp just like in Matt’s video.

Everything was going well until I paid closer attention to the pulley. I had a section that was really dinged up. I had the blade off, but the arbor was near the top when I walked the granite top off. The top sat and slid around on this pulley with its delicate grooves. OOPS! I still can’t quite figure out what this is exactly called, or where to get a replacement. Careful use of needle files and a dremel got the rolled edges out of the way. I have used it a while and so far, no shredded belts.

With the drive system back together I dropped the arbor, waked the top back on and proceeded to re-align the saw. The miter slots should be square with the side of the blade. The only method of “fine” tuning available is to loosen the screws, bang it with a mallet and check again. Tedious, but I got there eventually.

I attached my dial indicator to a sled to make it all go faster. Once aligned I was back in business. Good thing too, I have done a lot of plywood cutting since this repair and have more to do.

In summary, the video linked at the beginning is a good general guide. Additionally, get a basic bearing splitter set to help ease things along. Use good penetrating oil to help in removal. Clean up everything and apply oil for re-assembly.

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