13APA1ZT093just by searching the T240 it uses a 15/16 Nut
post the model number from under the seat that is on the sticker, so i can confirm.
Not a helpful reply for an 81 year old semi invalid trying to work on his lawnmower to save money but maybe it satisfied your need to be sarcastic to someone.Curious, I've seen this same style posting people asking for bolt sizes. Aren't most socket sets sold with more than one socket? Do people really only have say one 1/2" socket in their garage?
If you have one socket or wrench in your garage, might need to take the mower to a repair shop.
slomo
15/16" is the correct size. be sure to use a standard 6 point socket on it, less chance of rounding it off if it is tight.13APA1ZT093