I know this thread should be posted elsewhere, but I need exposure and I hope the Mods don't move it. I have an old chipper 6-8" barrel feed, no hydraulics. When I first got the chipper it could suck in a 15'x4" maple branch in about 1 sec. Now I have to cram it in. My question is are the blades dull? They don't look dull, not like a dull mower blade anyway. The belts are not slipping and the motor runs strong. It's just that it won't suck in branches anymore. This is probably a simple question, but it's my turn to ask one.