Home / Lawn & Garden / Parts / Tiller Gear Case 986-0091A Tiller Gear Case 986-0091APrice Not Available Price may not be up-to-date. Out of Stock View Product Part Number: 986-0091A Brand: MTD Seller: Sears PartsDirect Categories: Lawn & Garden, Parts Description This gear case (part number 986-0091A) is for tillers. Gear case 986-0091A turns the tine shaft to spin the tines. Wear work gloves to protect your hands when installing this part.