Introduction
Prerequisite only! This guide shows how to remove and replace the air cleaner cover on the Toro Walk Behind Mower 21199HD 2018.
Tools
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            While holding the deflector up and out of the way, lift the grass bag handle away from the mower to detach it. 
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            Remove the grass bag. 
 
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            Use a 3/8-inch socket to remove the four bolts securing the belt guard: 
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            Three 1 inch-long recessed bolts 
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            One 1 1/2 inch-long bolt 
 
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            Lift the belt up and over the left sprocket. 
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            Move the belt to the front of the mower, out of the way of the belt tensioner. 
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            Spin the left sprocket, with the blade attached underneath, until it is in a safe position, then place the belt on the sprocket. 
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            Spin both blades to ensure they don't touch during a 360˚ rotation. 
 
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To reassemble your device, follow these instructions in reverse order.