how do you replace the High pro key in self propelled mower

Model #917.378320 Craftsman mower Briggs Stratton motor. How do you remove and replace key part number 87677. Key pkg in SEars store is #80331 and states it is for all self propelled mowers. Will this work and how do you get to it. Thank You.

Craftsman , Lawn Mowers
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2 Answers from these members:
Manage My Life
I am not sure if the 80331 key will replace the 87677 key. You can order the 87677 key at

Parts Direct

To replace the 87677 key you need to drain the gas or put some plastic wrap inside the gas cap to keep it from leaking and put the mower on its side with the carburetor up.

Remove the blade, belt, and debris shield. Loosen the set screw in the drive pulley on the engine shaft and remove the pulley.

The 87677 key goes in the engine shaft and the groove in the pulley slides over the key. This keeps the pulley from rotating on the engine shaft.
by Manage My Life
August 30th, 2011
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