Toro Lawn Mower Mulching Problems . Install a newly sharpened mulching blade, and bolt it down with the same bolt that was removed. Lately i have been having to bag grass because the mower is not mulching well and leaving a trail of cut grass behind on the driest of days in august. Toro transmission lawnmower for Sale in Phoenix, AZ OfferUp from offerup.com By ensuring you are using uncontaminated gas, and keeping the air filters clean, and using working spark plugs, you can get the mower back to normal. It is the same height in the front as it is in the back.it is a mulching lawn mower. In this guide, we’ll look at all the most common causes.