God help us All,,, Sooner or later , some of us get in a bind and have to take a risk ,, TRUE STORY . about 25 years ago, Neighbor finally got himself a nice 730 diesel , Loved planting to that 2 cylindar sound ,, 730 had a couple ailments though,,,It did not like to start hot ,, No big problem , The Ol gal didn't use any fuel at all at idle , and hardly any all day long planting ... so they let it idle even while they did the milken'... 2nd ailmemnt was nearly fatal and WAS to a 38"new tire , The crankshaft nut had a tendency to back off from time to time,. No thread lokker seemed to work,.He noticed one day the damjamnut had backed off again, level field , no chain to give the 730 a pull and naturally in a hurry to beat the coming rains and willing to take a STUPID RISK . SOOO.!... he idled that motor to a near stall than took that big wrench and tried to catch that nut,! his wife told him" Virgal, I don't think this is a good idea" about the time that wrench caught and immediatly threw it headlong into the new back tire !! ,, ,. they told me that story a couple days after that event and MY knees went weak ... His wife nearly had heart failure right on the spot . That wrench could had easily sliced thru both of them and laid them BOTH dead ! . Within a week at the WIFES URGING that 730 got traded on a nice JD 2030 ,, Today , All is well and they are Propering along commiserate to their efforts .. AND ,they have another extra nice JD 730 That has a jamnut that stays PUT,.. but occassionally, They will share that harrowing story , especially around young Guys that like to take risks ... Blessings to ALL of You ,...And As that fellas Wife would say " Lets Not wear Out Our Guardian Angels by keeping them constantly on Their toes"