Question about Hobart D340-6007 Mixer

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Mixer squeals.... where should I be looking first to solve the problem. Is it just a lubrication issue of something major? Where can I find manuals or diagrams to fix it? Thanks for the help in advance.

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The 300 series of mixers use grease in the trans case. I have never seen this type of noise come from the gears.

I suspect the noise is either from the motor or planetary. The first thing I recommend is to use a long screwdriver or socket extension -- put one end on the unit, and the other against your ear. Test different spots on the mixer and narrow down the location of the noise. Like I said, I expect the noise to be the motor. In particular the front motor bearing.

I can help you futher if you narrow down the location of the noise. Here is the parts catalog.

http://www.hobartlink.com/extranet/extranetmanualsandcatalogs.nsf/41B8C834DE2B5C6B852568E1006A9A01/$File/F19154%20Rev%20C_lk.pdf

Posted on May 10, 2008

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The planetary and spiral-beveled gears are self-lubricated for life. The lubrication used is micromly grease and must be re-applied if gears are replaced. The transmission uses Mobil "delvic 1" synthetic oil which should last the normal life of the mixer. No lubrication is required for the auxiliary drive hub.
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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.
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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).
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Good luck and have fun. I hope this helps. Howard, Burke, VA
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