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My lwn mower won't pick up cut grass? what can I do my model is : Craftsman Professional 179 cc 21 in. Walk Behind Mower
71-88921
California Model 71-88721

I'll try either a plugged chute, or a blade that was installed upside down after sharpening for $300.00, Alex.:wink:

Your blades are shot ! The blade has lift wings on each end - I bet the metal thinned out and those tabs snapped off .

Make sure that your engine is also running at least 3000 rpm's as well as the blades.