Machine falls off rails

[PhyllisM50]

my Millinium didnt move as freely as I wanted, so  I loosened the screw a little as the manual said to ease up the movement

and then it falls off the rails,  just in one place on the rail

do you think I need new wheels,  havent replace them for 7-10 years or so

Phyllis M

 

[jimerickson]

I'm surprised it "falls off" in only one place.  Examine the rail for damage of some sort.  Tighten the wheels back up.  As for new wheels or not; examine them for wear.  Are the grooves nice and smooth?  Is there any play between the hub and body of wheel?  If you find any problems with the wheels, then yes, they need replacement.  If the wheels look good, concentrate on proper adjustment.  My guess is that you had them too loose to begin with.  Good luck.  Jim