Follow these instructions, but before adjusting the guides see the link below.
It sounds like you have not correctly adjusted the guide blocks that ride on either side of the blade, both above and below the table. These small rectangular blocks can be adjusted by loosening the allen set screw in the guide that holds them in place. They should be pressed in against the blade lightly, without deflecting the path of the blade out of square to the table. (You may first have to sand the ends of the guide blocks square if they are grooved from use. Use a belt sander and a pair of vise grips to hold the blocks while you square them off.) Anyway, the guide blocks should allow the blade to run smoothly, (you might hear a tick tick of the weld passing through the blocks), but will not allow the blade to deflect from side to side. Correctly adjusted, they keep the blade aligned with the bearing behind it, and prevent the problem you describe.
Only after you have correctly adjusted these guides just behind the set of the teeth, and the blade is turning freely by hand when you spin the upper wheel, do you bring the bearings in to kiss the back edge of the blade. Make sure the bearings are lubed to spin freely with a little bearing lube or wd40, then bring both the uppper and lower bearings in until they almost spin or just barely spin when the blade is turned by hand. When you exert a little pressure during cutting they will then hold the blade in place between the guide blocks, so the blocks don't wear the teeth away. Please see this link
for detailed instructions I gave another user. (possibly also here
) They will apply to your saw as well. If you have any questions or further probelms, write back. You may also wish to check here
for a pdf manual for your saw.(check both rockwell and delta).
If you take some care to properly tune the saw, you will get much beter cuts and the saw will be a joy to use.