E-Z Lock Insert Versus Replacing the Table Shaft

By | October 6, 2017
Image of 5 EZ Lok Threaded Inserts
5-pack of E-Z Lock Inserts

Why should I change my E-Z Lock inserts on a regular basis?

What intervals should they be changed at?  

These two questions are easy to answer.  First off why should I change the insert?  There are lots of contaminants with your metal, dust, and debris that get into the insert and table area.  Also with the coolant and water concentrate being used, this can pack very small into the threaded insert making it hard to insert the hold-down bolt and damaging these threads.

The inserts have a red coating of Loctite on the external threads to keep the insert in place.  When removing the insert it may be helpful to use a small amount of heat from a small or mini butane torch to release the thread lock.  Using the tool supplied with the machine, (PN: 794-8637-45), it should be easier to remove the insert counterclockwise.

How often should Threaded Table Inserts be replaced?

The intervals that the Threaded Insert should be changed is either once per month or every 50 flywheels.  This would make it easier to remember when to change them.

The Dreaded Table Shaft Replacement

So you stripped out the threads of the Threaded Insert in your flywheel grinder table. Or perhaps your maintenance man welded a stud to the insert so he could get the insert out and it still won’t come out. Maybe you got a hold-down bolt stuck in there and ruined the threads that the threaded inserts thread into! Well, there is a fix for that.  

REPLACE The Table Shaft.

Most people don’t realize the center threads are actually in the spindle shaft of the table which projects through the center of the table. So you don’t have to replace the table, but you will have to replace the shaft because you need to use the inserts that will no longer fit if you tapped that hole larger.

The Flywheel Grinding Table Removal Process

The heavy table (90 lbs.) is held on with 4 bolts, which you need to remove.  The table will lift off, but it will take 2 people to lift that off, being careful not to drop or distort the table, (it’s been done). It’s heavy and being held in place by the oil under it so you may need to use a pry bar to break it free from the oil suction.

Drain the oil out and discard any contaminated oil.  Release the bottom set screw on the table shaft using an Allen wrench through the provided hole or gap in the gearbox just below where the shaft enters the gearbox. Then remove the Table Motor and Gearbox combo from the underside of the table casting

(A) in the image shows the setscrew and (B) is pointing to the barely visible shaft keyway. This is a newly installed gearbox so the image is likely much cleaner than what you will deal with on a production machine.

Now, remove the table shaft from the housing, by pulling up on the shaft. You will want a bucket underneath to catch any lube you didn’t out of the top of the casting. Once you get the shaft out, it is time for replacing.  You will need to replace the seal that the shaft goes through by removing the motor and gearbox from the bottom of the top casting. There is a  90 percent chance you nicked the seal with the keyway cutout on the end of the shaft when you removed the old shaft.

The new shaft will have the new bearings pressed on already at the factory. Carefully replace the shaft by aligning the key into the keyway slot in the gearbox housing. Be very careful when inserting the new shaft that you don’t nick the new seal. Once in place, you can add 2 quarts of oil and then replace the table.  Secure the table with the 4 mounting bolts.  Now add the remaining partial quart of oil and be sure to check your oil level with the dipstick.  Also, don’t forget to refill your site jar in the back.

In Summary – Replace The Threaded Inserts

Not only is a shaft replacement a bit of a pain to do, but the cost of it in parts, downtime, and your time doing the work also far more than simply replacing the inserts on a regular basis. Then your table shaft will be fine for a lifetime.

Basic regular maintenance is required to keep your machine operating at optimal performance.  Please check your manual for more maintenance information.  

If you don’t have a manual then visit The Kwik-Way Manual Downloads Section for a free download of the most current manual. Also, keep in your memory bank that we occasionally update the manual with new service and maintenance information so check back every now and then for any updated versions. Each manual has a revision number printed on the cover.

For replacement E-Z Lok Inserts use part number 794-8017-44 for a single or 794-8017-45 for the pack of 5.  Only found at Irontite Products 800-553-5953 or online at our web store.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.