Question about Bosch MUM4420UC Compact Series Stand Mixer

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Bosch Compact Mixer Model UM 4. I am replacing the spur gear. That seems to be fine, but, like most of my projects, I now have "extra" parts. One is a foot. The other 2 are washers. The third is the one that concerns me. It is a black rectangular shaped block with "E8" stamped on on side. It's about 1/2 inch long and about 1/4" thick. It's not magnetic. Can anyone tell me where this should go? Many Thanks!

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Check this assembly diagram of a similar model.
The spur gear is part 7 and the rest seem to be washers etc around it.

Unless the rectangular block is part of the packing it may have fallen off from the one of the assemblies in the main body when you opened it. The assembly diagram could help you find the location.

Posted on Sep 02, 2010

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3 Answers

Dough hook & beaters slipping


you can generally find a local repair shop that specializes in resturant/bakery equipment/small aplliance. they will have the parts you need as well.. good luck please rate this

Sep 03, 2008 | Bosch MUM4420UC Compact Series Stand Mixer

1 Answer

Kitchen Aid 550 Pro Mixer New Worm Gear and Worm Gear Follower Issue


It would be helpful to get the model number and serial number off of the bottom of the mixer. This will help determine if the gearing has changed at all.

Usually when a mixer is making a lot of noise after replacing the gears we can find a small nick or gouge in the gear. even the smallest damage can cause these mixers to make a lot of noise. Also if you have an older mixer there was a change in the worm gear from 53 teeth to 60 teeth on the gear. If your mixer originally took a 53 tooth gear, and you replaced it with the 60 tooth gear it will make a lot of noise like you are describing.

So first check your serial number, if the first 4 digits are after WL45 your mixer would have a 60 tooth gear, however if it is a WL44 or before you would have originally had a 53 tooth gear and this is what is causing the loud noise.

If your mixer is new enough that it took the 60 tooth gear, then take the mixer apart, clean and remove all gears, clean them off with wd-40 and inspect closely, even the smallest chip can cause a ton of noise.

If you have any questions, or you cannot find the problem feel free to contact us at The Mending Shed.

Thank you,

Colleen
Customer Service
MendingShed.com
800-339-9297

We Repair Anything Under the Moon!

Apr 04, 2013 | KitchenAid New Professional 5.5 QT...

1 Answer

KitchenAid Mixer is not rotating.


Hi MANILYNTHEOB. I’m sorry to hear about your mixer not working. Unfortunately from the symptoms you describe, your mixer has experienced a transmission failure. You don’t mention how old your KA mixer is or how hard it’s been used, but for your particular model, KA has a plastic gear designed to fail, instead of the whole mixer ‘going up in smoke’. And what it sounds like is that this fail-safe gear finally ‘failed’ (stripped) so that the power from your electric motor is not getting to your planetary (“elliptical rotating part”) and the agitator shaft. What can you do?
The good news is that this can be fixed quite easily (OK, maybe a little effort) by yourself, if you are a DITY type person, feel adventurous, and your mixer is not under warranty you can troubleshoot it yourself. Be sure you have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> then enter the visitor type “Consumer” and then enter the 6 character model number, in your case use KSM50P (Your K5SS mixer falls within this manual), and select the first file KSM50P.pdf (438.31 KB) listed under Parts List (4) and then check to verify this matches your mixer model.
Turn to pages 4 & 5, titled: Case, Gearing And Planetary Unit for the disassembly and reassembly of your mixer, along with all the parts. Locate Illus. No. 58, Worm Gear Bracket & Gear, including Illus. No. 12, Worm Gear (23 teeth). I suspect this is the weak link in your mixers transmission and causing the problems. After clearing all the grease away, you’lll probably find that is has been stripped.
You can order a replacement gear and install it yourself. While you’ve got your mixer this far apart you can check for any other unseemly wear and tear on the on the gears and other components. Besides a replacement gear, and grease you might consider replacing the gasket, too. You should use a food-grade grease that you can order online (although I’ve seen automotive bearing grease used too – your call). Do not try to reuse any original grease as this should be filled with debris from the stripped gear.
Here are five potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com; and Grainger.com. You should search for ‘food grade grease’. Prices can vary widely between vendors, so do your comparison shopping.
It can be messy but quite gratifying to diagnose and repair your mixer yourself.
Finally, here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer. The mixers displayed in the links are different KA models, but the principles are the same.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer, should you decide to go that route.
If you feel this repair is beyond your capability, then I would seek out a local small appliance repair shop in your area. KA Customer Care can give you names of local KA authorized repair shops in your area, but you can also do an online search to supplement what KA may provide you. Call to explain your circumstances and find out their hourly rate and get an estimate of what they think it would cost to repair your mixer. Also, always obtain three or more estimates – do some comparison shopping. Good luck, I hope this helps. Howard, Burke, VA
If this solution was helpful, please rate it, thanks! – hslincoln

Jul 08, 2010 | KitchenAid K5SS Heavy Duty Commercial...

1 Answer

Trying to determine how to lubricate the gears?


Hi CONTACT_TOS. I’m not sure what removable cap you are referring to, unless you are referring to the two plastic caps with screwdriver indents on opposites sides of the head? Do not remove them. Those are Brush Holder Caps for access to the electric motor brushes. You do not want to remove them unless you are replacing the brushes.
Why do you want to add lubrication to your mixer? The internal gears of your mixer are factory packed with enough grease to last a 'lifetime'. Unless your mixer is quite old; greater than 10 years, you shouldn’t have to replace any transmission lubricant. Your mixer’s transmission lubricant (grease) does break down over time and usage into its components; basically oil and suspension additives, and sometimes your mixer might leak a little oil that has seeped beyond the transmission gasket and found its way out of the mixer. Gravity can be very insidious. But even then, if the amount of oil you find leaking is small and your mixer seems to be operating normally, you needn’t worry about the replacing the lost lubricant.
If you still wish to check or replace the lubricant, that’s OK, too. It never hurts to get under the ‘hood’ of your mixer and see how it all works. Before you get started though, it would be helpful to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> and select “Consumer” for User Type, then enter the 6 character Model Number, in your case use KSM50P (Your K5SS mixer falls within this manual), and select the first file KSM50P.pdf (438.31 KB) listed under Parts List (4). (Check to verify this matches your mixer model.)
Turn to pages 4 & 5 titled: “Case, Gearing & Planetary Unit,” for the disassembly, troubleshooting, and reassembly of your mixer’s transmission gears, along with all the parts. It can get quite messy but be gratifying to diagnose and repair your mixer yourself.
Once apart you can check for any unseemly wear and tear on the gears, etc. You may also want to consider replacing all the grease, particularly if debris is suspended in it.
Besides any replacement grease you might consider replacing the gasket (Illus. No. 26), too. I recommend using a food-grade grease that you can order online (although I’ve seen automotive bearing grease used too – your call).
Here are some links to several excellent websites that detail the disassembling/greasing and reassembly of a KA Mixer. The mixers displayed in the links are different KA models, but the principles are the same.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer along with replacing the lubricant if you wish to.
Good luck and have fun. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it. – hslincoln

May 04, 2010 | KitchenAid K5SS Heavy Duty Commercial...

1 Answer

Kitchenaid stand mixer


Hi JO18395. I believe you meant to say the ‘gears’ are stripped... But, to answer your question you will need to go “under the hood” to determine which gear assembly has failed.
The inspection and troubleshooting of the mixer transmission is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the correct Part List manual around when you start to disassemble your mixer. If you're lacking one, you can download it from the KA website (http://www.kitchenaid.com/flash.cmd?/#/page/home).
Click on Customer Care>Locate Manuals& Guides> and enter the 6 character model number, in this case K45SSW, and then select the file under Parts List (1) K45SSWH0.pdf (341.41 KB) (be sure to check that it this matches your mixer).
Turn to pages 4 & 5 titled: “Case, Gearing & Planetary Unit,” for the disassembly, troubleshooting, and reassembly of your mixer, along with all the parts. I suspect your culprit gear is Illus. No. 8, Worm Gear, in Illus. No. 38, Worm Gear Bracket and Gear assembly. KA designs this gear to fail on purpose so the rest of the mixer will not self destruct.
Once apart you can check for any other unseemly wear and tear on the gears, etc. You may find more parts that need replacement than just a bad gear. You may also want to consider replacing all the grease, particularly if gear debris is suspended in it.
Besides any replacement gear(s) and grease you might consider replacing the gasket (Illus. No. 19) and “O”-ring (Illus. No. 34), too. I recommend using a food-grade grease that you can order online (although I’ve seen automotive bearing grease used too – your call).
It can be messy but quite gratifying to diagnose and repair your mixer yourself.
Here are some links to several excellent websites that detail the disassembling/greasing and reassembly of a KA Mixer.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer.
If you feel this is beyond your capabilities and will be too difficult to do by yourself you can take your mixer to a local small appliance repair shop and have them troubleshoot and fix your mixer. KA Customer Care can provide you with the name and phone # of the closest authorized KA repair shop in your area or you can do a Online web search, but be sure to get at least three estimates before deciding to commit to one repair shop.
Good luck and have fun. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it. - hslincoln

Apr 29, 2010 | KitchenAid K45SS Classic Stand Mixer

2 Answers

My K45SS is leaking some kind of oil or grease from the part of the mixer above where the mixer part attaches. It otherwise seems to be functioning fine.


its gear oil from the gear box that the motor turns to make the beaters turn,you need to replace the seals or keep adding food grade oil before you dry out the gearbox and ruin it

Mar 09, 2010 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Stripped beater gear


It is terminal. This is the fatal design flaw of these mixers. The gears are made of soft plastic and strip easily. Even the gear housing is plastic that is either glued or melted together to make it unserviceable. I have never suceeded in finding the part from either Sunbeam or one of the many appliance repair places on the web (who charge the cost of a new mixer for repair). Sunbeam does not repair them; if it is determined to have malfunctioned due to quality or design while under warranty, it is simply replaced with a new one. I had mine replaced under warranty twice, each time they sent me a new one complete with extra bowls and beaters. Now I have three sets of bowls and beaters and no functioning mixer.

May 25, 2008 | Sunbeam 2346 Heritage MixMaster Series...

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