Problem possible cause remedy, Drivelines not phased. replace driveline, Blade broken. replace blades in sets – Alamo FC-0016 User Manual
Page 139: Blade carrier bent. repair or replace carrier, Blade hub not properly remove hub, check for wear, Seated on shaft. and replace or seat properly, New blade matched with replace blades in sets, Worn blade, Using straight blades. use fan blades in grass, Carrier rpm too low. increase pto speed
