How to disassemble mixmaster heritage series model 2351

Try to wiggle it out with the button pressed.

One of the beaters had jumped a gear. I understand they are nylon gears. My wife's had the same trouble. I unplugged the mixer, removed the bowl and install the beaters if you can to see where they are touching. They were two cogs off. I grapped the left (red) beater firmly and twisted it to the left. It took a couple tries and turning on the motor (with out beaters) to find the spot where they had skipped. In the end the left beater jumped back one then two teeth and now the beaters aline properly.
This will happen again with heavy dough, etc. now that the teeth are worn in that spot. Use a bread machine for the heaver dough. IMHO

I would propose to solution to your problem,
one. Try getting some clear contact and cutting a a square or circle a little more than the size of the dial. Removed the dial if possible and later clear contact over the surface.
Two. Get some clear nail polish and cover the markings on the dial with thin coat.
Warning warning warning!!! (Test the nail polish on a surface that is not exposed, for example underneath) to make sure that the nail polish does not react with the surface of the mixer.
Regards
Trevor

If this mixer sits on a stand, first remove it from the stand. Turn it upside down and shine a flashlight into the right side socket to look for obstructions. When you say you swivel the head, do you mean you rotate the handle? This is how to eject the beaters after use. It may be that the ejector on the right side is stuck. If so, you will need someone with mechanical skills to disassemble & repair.

many of the beaters are available online. There are replacements available for the mixmasters.
Check for your specific model HERE...

Merry Christmas to you..

Try placing some "braces" rubber bands around the shafts of the beaters. This should tighten the hold of the shaft with the mixer and keep them more straight.

The speed control on the back is simply a variable resistance potentiometer, the same thing that controls the volume on older amplifiers. The output current to the motor is supplied by the printed circuit board in the bottom of the unit. This allows gradual increases in speed to avoid over-torquing the motor on speedup. Even the poshy-posh-posh mixers do this.

At least it still works. The most common problem is the cheap plastic drive gears that strip out with a mild cookie dough, this jams the beaters together and requires burial-at-dumpster.

Go to sunbeam.com, select "kitchen", then select "customer service", then "instruction manual", then "stand mixers", scroll down to model #

Pry the beater release button out with a screwdriver. There are two screws underneath it and one under the motor housing between the the beater holes. This will allow you to remove the chrome front cover, but not the motor and drive assembly. Getting to the part that contains the gears requires complete disassembly of the mixer. It is not designed for service, and requires patience and a variety of tools to disassemble.

It has a metal worm gear and plastic drive gears. If the beaters are out of alignment, then one or both of the plastic gears are stripped and the mixer is junk. Repair plus shipping costs equals the price of a new mixer. This is the weak point of these mixers and a fundamental flaw in an otherwise robust and sturdy design. It is definitly not the same mixer *********** bought 30 years ago.

http://www.repairclinic.comThis is a helpful website with an 800 number and they are good about helping with the fix.
You probably have to replace worn gears and or bearings.