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Food Mixers Expert
Re: Motor burned up?
What is the specific issue you are having with the mixer that makes you feel that the motor is burnt up? There is a variety of issues we see with KitchenAid mixers, however the motor being burnt up is actually rare. If you could get me the model of the mixer (that is under the base of the mixer on a label), then I can tell you what to look for in the mixer.
The most common issues in a KitchenAid mixer, depending on the model include: gears, brushes, and electrical components.
The grease is always black, it is actually a dark brown color but looks black, over time it can break down since it is vegetable based and can leak out of the mixer.
However I find that in 90% of the cases the repairs are fairly easy and worth the repair.
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It is highly unlikely to be lack of grease, most of them do leak a bit especially if not used very much. It is harmless as they only use food grade grease anyway. If you are not electrically competent don't mess about with it. Follow the power and make sure that power is finding its way to the motor first.
the smell will be burning insulation on the windings of the motor probably from the brushes being too short and arcing on the armature thereby overheating the motor. suggest you take it to an appliance repair shop for quote on repairs.
there is 6 oz of a food safe lubricant in the motor housing that is held in by a gasket around the front of the gear housing in the top of the mixer, the gasket is leaking the separated liquid of the grease. The grease because it is a vegetable based product separates over periods of non use and the gasket gets soaked and releases the liquid into parts of your mixer and it drips it's way out when you use it. the best thing to do is install a new gasket and remove the old grease then repack and add a new gasket. There wasn't that easy?? problem is that most people don't know where to buy the KA approved grease and gasket (ebay about 17.00) and most people don't know how to take their mixer apart to do this, (youtube has about four really good step by step videos on how to do it) BUT!!!! there is a trick that often works, seriously!!! get a towel and spread it on an open work space, grab your significant other or any one that will tolerate you when you get this way you will need their hand. Now turn the mixer upside down (no I'm not being sarcastic) turn it upside down, now have your partner hold it while you reach down and plug it in and turn it to speed Two, and hold the mixer like that for two minutes, (that's why it's better to have a really good friend help you they won't tell you how nuts you are doing this, but!! continue. After two minutes turn the mixer off and turn it right side up and turn it on again for two minutes, then do it all over again upside down then right side up, do this at least three times. the drip is now fixed. You think I'm nutz right??? Wrong!!! What you have done is re-mix the gear grease, the liquids are now re-mixed with the solids or gear grease base material. It should last about a year or so. My suggestion is to do this once or twice a year if you are not going to use the mixer for long periods of time. The separation usually happens when the mixer goes for long periods of time without use. the grease is designed to work for five or ten years without being replaced. however the gasket is made of fiber and the weight of the motor head pressing down on it for a few years of say 17 pounds causes it to compress and allow the liquids to leak out. So to fix that you take of the drip ring off (round silver thing that attaches to the planetary ) then drive out the little silver pin in the planetary shaft and pry off the planetary. you will then see five flat head screws that hold the motor head to the lower gear case, thightem them up and re-assemble the mixer then remix the grease, you have fixed your drip problem without spending a dime and it will stay fixed for years as long as you have no other issues arise during it's life. Hope that helps you.
In the mixer there is a worm drive gear, it is a fail safe so that you don't burn up your motor in just this insatance. the gear is nylon and when the machine is torqued too much the gear is designed to give out or strip. It is making a terrilble racket because all those chewed up teeth are now being milled and ground up while you are trying to use your mixer. STOP!!! the part costs about $8.00 USD and takes about two hours to fix. You should put a new gasget in but a lot of people dont want to spend the extra $6.00 buck because you have to buy new grease for this fix also, about $25.00 more. You must clean out all the old gear grease to make sure all the chewed up gear teeth atre out of the machine, then repair with new worm gear part and then re-pack with grease and add the new gasket and close up the machine all fixed. about 3 hours time $50.00 and a roll or two of paper towels. (The grease is real messy)
If you have some length on the brushes they sound OK. If they're getting short they may need replacing because they're not making full contact all the time and may be arching. Your problem may also be in the gearbox. May need new grease and have the gears, shafts and bearings checked for excessive wear.
I took mine all apart and the oil was just at the point of turning into grease. Nasty,, brown smelling ****.... I cleaned it all up and just used a sync 50w gear oil.. I over filled it and the extra ran out of the motor end of the gear box... It might have been about 2 table spoons too much.. Now it does not leak anymore.
7.8 sounds a little high. I'd inspect the GREASE in the unit. Just take off the top cover and then remove the dust cap. The grease in a D-300 is a really thin grease. It lays in the gear case. If things look dry, I'd consider tearing it down, cleaning it up, and repacking it. Get the grease from Hobart. The wrong grease will stress the motor futher.
There is the possibility that if the mixer is 30 years old and it has never been serviced that the gasket around the gear case is leaking oil and in that case it would not be hard to get liquids on the armature or the stator as the gear grease in the transmission is vegetable base grease and it separates into liquids and solid and when the head is tilted up the failed gasket allows the separated oil to leak down and to the rear onto the mixer right onto the motor parts. It maybe nothing more that cleaning out all the old grease and re-packing and adding a new gasket.
Ok, do you want to know how to disassemble? i just inherited a kitchenaid mixer from my brother and it had the exact symptoms. First, using a hammer and pin punch, drive out the pin that holds the beater mechanism. Pull off the mechanism and remove the chrome ring that is above it. You will see about 6 screws under there, remove them. Next remove the 2 screws at the opposite end of the bottom of the motor housing. Now carefully and evenly separate the motor housing. The motor will come off completely. Lay the motor aside being careful not to pull the wires too much. you might want to support it with a box or something to rest it on. Ok now you will see a bunch of grease on the gears. Put the grease in a paper cup as you will need it again. Wipe off the gear assembly and examine the teeth on the gear. chances are there is a spot where there is no teeth at all. Replace that part, put the grease bak on the gears and reassemble in the reverse order. I did mine in no time, just pay attention to what you are doing. The chrome ring is a little tricky to get it back on but it will stay if you keep trying. You might have to roll it against a hard surface to bend it inwards to make it fit tighter. Good luck and let me know if this helped you out!