Moin Moin, need your help. I have an MTD lawn trecker with rear ejection. 92 cm mower, with 2 new knives, motor 13,5 HP. I have renewed both knives and also properly mounted them. They are combi knives which are for mulching and also suitable for rear ejection. If the good piece is running, the mower leaves the grass under the mower, partly he shoots out the grass even under the mower, enough wind makes the thing anyway. The channel is clean and free. The mower is already a paa r years old, what about the mower pan??? Am open for every tip.