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Loosen the two planetary nuts, should be a thin nut and an acorn nut. With these loose make sure the large nut on top of the transmission is tight. Push the planetary all the way up on the shaft and turn the thin nut up until snug. Back the thin nut off 1/4 turn. Hold the thin nut in position and lock the acorn nut against it. The planetary must have a very small amount of up and down play.
Take the top cover off,in front of you is the brake.Turn the mixer on and you will see it spin (put it in 1st gear),stop the mixer.on the right side you will see a pin that catches the brake flange,if its worn you can replace it,if its not worn then the brake needs adjusting as it acts like a clutch.Let me know,im a hobart tech band repair these units often.
Hobart mixers are NOT designed to change gears while operating. The Hobart planetary gears are like the transmission in your car but, without the clutch. Everytime you change gears while unit is running you are tearing up the brass spacers, gears & seals. Time to call a QUALIFIED service tech to come out & sell you another planetary or rebuild your old one, about $2K, Buy a Varimixer if you want to change gears while unit is running, they use belts. Another planetary premature failur cause, over loading the bowl. Batters & icings- 75% bowl capacity, Dough 65% bowl capacity.
Check the spring pin that locks the motor shaft to the main drive gear in the gear box. You should be able to turn the motor from the back at the cooling fins and watch the shaft spin in the gear, that is if the pin is sheared. That is a common problem. if you plan on keeping this machine for a while, i recomend that you spend a little more on a quality spring pin,