Can't say I'm familiar with this model though it sounds as if most probable cause is gumminess in the feed mechanism. Old oil and sprays act as a cement in the works and cause parts to not function properly due to sticking. Pretty tough stuff to dissolve away and it often takes persistence and getting dirty. Best to think like Sherlock, examine and ask yourself "Why arn't the feeddogs moving forward?" You might find a stuck or broken part or the feed might be set to zero or dropped. Good Luck.
Jon
Last edited by jlhmnj; 04-19-2013 at 01:17 PM.