Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
The typical mulching deck will have baffles under the deck with the blades. Could one of the baffles have fallen off and is no longer there? Have you had te deck flipped over so yu can see if there is any welding marks showing where an old baffle may have been? With a 10 year old deck, it is possible. Assuming it used to work correctly!
Blades are good, and installed with the raised tips up?
Do the blades seem to spin as fast as always, or could the deck belt be slipping? When was belt last replaced?
Th e drive belt from engine to deck replaced, as well? and it is tight?
Engine rpm fine with no loss of power? Just the deck does not cut!
I think I would flip it over and look for missing parts. All decks come with some kind of baffling or rounded corners , to help guide the grass to the output.
Almost sounds like the blades are the wrong length.
18 inch blades?
Blades show to be 17.9 inches. Not a lot of difference, but a 1/4 inch on each blade would be 1/2 left standing. Looking at basic Z force 50, this is the blade it shows to require, see link below.
OK< I will opt out, maybe someone else has seen this. Please do not respond to me, as it will lock the question. Personally I think the blades are wrong length.