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Jon K.
Jon K., Small Engine Diagnostic Expert
Category: Small Engine
Satisfied Customers: 5776
Experience:  Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
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Model # 917.974143 craftsman eager beaver 6.75 hp lawn mower.

Resolved Question:

Model #NNN-NN-NNNNcraftsman eager beaver 6.75 hp lawn mower. makes a loud banging noise when running like metal on metal. i have check blade andself propel system and all seems fine. i dont think it is a internal motor noise but dont know. what do you think?
Submitted: 4 years ago.
Category: Small Engine
Expert:  Jon K. replied 4 years ago.
How did you check the blade? If it was turned over by hand then you probably were not turning it fast enough. Remove the spark plug and and have a helper turn the mower on it's side so you can watch the blade. Make sure the air filter is pointing up. Have them pull the machine over fast (it should be easy without the spark plug in) and watch the blade and the crank. You may have a bent blade or a bent crank. Spinning the engine over this fast you should be able to see what is going on. You can also look for clean metal marks on the undercarriage of the mower to see where your blade is hitting. Let's hope it's just a bent blade and not a bent crank.
Customer: replied 4 years ago.
crank? not to be dumb but where and what is it?
Expert:  Jon K. replied 4 years ago.
No problem, the crank is the main shaft that runs through your mower and attach's to the blade itself. As the motor spins it, it spins the blade.
Jon K., Small Engine Diagnostic Expert
Category: Small Engine
Satisfied Customers: 5776
Experience: Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
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