If you are plugging with trash you will need to find leak in fan area. Check rear feed door, rock door, missing panel above axle, ect. If everything is in place will need to seal things up better so material can't get sucked in. Maybe area where trans shift cables go threw ect. If you are saying that chaffer is plugging with wet snow and or dusty mud ect. than you will have to wait for warmer or colder day.