bought 2 lincoln Impinger model#1302-11QT s/n3038862 3-04 240w 2 wires. everything seems to be in great shape except the conveyor seems to be real loose and track doesn't lay flat and will snag up and stop turning while hearing a click click. not sure what i have to do to fix the problem. i didn't get manual with the oven. thank you for any help. jon in iowa