We have a problem with ours where it's leaving a strip of grass in the middle but it only happens sometimes in a field so you'll have small strips scattered around a field
The knives are blunt and the grass is too trampled. Just put the tractor in a lower gear to make it move slower and the mower will have more time to cut the grass in this place, even with dull blades. It is best to start mowing with sharpened blades
All lawnmowers with drums have an issue of imbalance with the result that they appear damaged. Over time, soil enters the vertical rollers and the cutter begins to break down....
