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disconnect the spark plug turn the mower on its side and inspect the drive belt on the pulley above the blade (on the crankshaft) it may have a shroud over it. Also there is a small gear case that maybe dry that the belt drives, that goes to the wheels, Also try lifting the drive wheels up off the ground and engage them and see if it still does it. if it stops once lifted it might be the bushings on the axle its self.
Not familiar with tecumseh lawn boy. Lawn boys I worked on were 2 stroke, if this is the case the crank seal is sucking air after engine warms up. New seal would fix. If you can't do it you're self may not be economically worth it.
Rear wheel drives like this have pinion gears with rachet pawls that allow them to go backwards freely while locking when the transmission drives them.
You need to take off your rear wheels and carefully remove the pawls. They look like little squareish metal shaft keys with springs under them. You should notice that the keys or pawls are covered in what looks like grease.....which is actually worm metal from the pinion gear and oil mixed together to form this pastey greasey substance. Clean all that stuff off and lightly oil *( light oil...3 in 1 kind of oil) and reassemble.
You should hear the nice clean clicking of the rachet pawls as you roll backwards again!
No brake down on gear box for auger, part #740013 and its DISCONTINUED, belt # 700035
sheer pins 700104 , this was made in 1988 lawnboy bought gilson this was a gilson, many parts are
now discontinued . Be careful when buying a new 2 stage there are many out there now that engines are made in china
even on Mtd, look for briggs or honda tecumseh went out this year .
good luck
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