Hi,
This machine is older than mine, but on mine I did the following:
Raise the drive motor to loosen the drive belt.
On the underside of the spindle there is a set screw - loosen it all the way.
Pull the spindle out the back (drive pulley side), and you're done.
On my machine the motor ran the cartridge through a flat belt.
On mine the place where the set screw hit the spindle cartridge there was a flat.
If there is no flat on yours, the set screw may have raised a burr, so it may
require some gentle persuasion. You could use a modified wheel puller to get it
out. I had no trouble getting mine out. I just pulled mine out by hand.
I would inspect to see if there were other retainers, other than the set screws,
before I get physical. I would not remove the cartridge if the bearings don't
need replacement.
If the bearings need replacement - the best way is to use hot and cold to expand
and shrink the opposing parts into place. When you get the bearings in place
correctly, run them in for an hour or two, and re-tighten all the nuts. But on
your machine this may be hard to do if the motor and cartridge are on the same
shaft. If they are on the same shaft, I would have the bearings replaced by
a professional who had all the proper equipment to do the job.
You need to know which way the bearings go in relative to each other in
order to obtain the proper pre-load. If you do it wrong you will ruin
your $700 worth of bearings. You also have to know which pre-load to
order the bearings with. The bearing are made as matched sets with the
spacing between the bearings determining the amount of pre-load. You
tighten the retaining nuts to the point where the two bearing races
touch, thus giving the proper pre-load.
You will need a special grease to pack your bearings with. You will
need to know how to pack the bearings. I would find out what grease
and what method of packing the bearing manufacturer recommends, for
your grinder application. Packing is not a no-brainer, like packing
a car's wheel bearing. To much grease and the bearing will overheat,
and to little and the bearing will run dry, and gall the race.
Good Luck,
Paul Hoffman