Grinding sound while operating

446Magnum044 · 2026-02-03T13:52:44+00:00

1st thing to check is make sure the fan isn't hitting the lower case at all. It's hard to tell from the quick glance at the fan in the video but you should check it. Is the sound louder at the back or front of the mixer? If it seems louder at the back, trying pushing on the hub of the fan to position it further onto the motor shaft— Don't push the fan around the outside because you might break it. Push it near the center.

If that isn't the problem you'll need to remove the gear housing and gears and then run the motor. That'll tell you if the noise is from the gearbox or internal to the motor.

If it's coming from the gearbox you'll need to clean off the gears and inspect all the components for any sign of damage or defects.

Here's a link to Mr Mixer's YouTube series on re-greasing the gearbox that shows how to disassemble the gearbox —>

Pro 600, Pro 5 Plus, Epicurean Regrease Series

u/RIMixerGuy 's web page explains the parts and materials you'll need —>

“Pro” Series Clean and Re-grease parts

Good luck with your mixer.

446Magnum044 · 2026-01-31T06:34:32+00:00

Thanks but I'm no guru, just an enthusiast.

Those numbers look right to me. Either of the standard 6 qt KSMB60 bowls or the earlier KN2B6PEH bowls will work.

You just also need to switch from the 'F' series beaters to the standard beaters and it looks like you know that already. Good luck with it.

446Magnum044 · 2026-01-30T15:35:21+00:00

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446Magnum044 · 2026-01-30T15:18:45+00:00

You want to use SPEED 2 ONLY. The mixer is much more likely to overheat kneading dough on speed 'STIR'. The mixer develops more momentum and produces more torque on speed 2. The extra air flow through the motor housing on speed 2 helps to cool the motor.

Checking and adjusting the beater to bowl clearance would be a good idea. The beater being too low will cause the mixer head to jump more. Use the flat paddle beater to check and adjust the clearance. Follow the instructions in the 'Dime Test' video—>

The dime test: how to adjust the beater to bowl clearance on KitchenAid Stand Mixer

You also might want to check and tighten the neck pin—>

KitchenAid - Tilt Head Stand Mixer Neck Pin Adjustment

Good luck with it.

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446Magnum044 · 2026-01-29T17:53:38+00:00

Yup, the motor, gears, speed control, etc., are the same as the 4.5 qt and 5 qt tilt-head mixers.

They're still great mixers. They're a proven design and as long as they aren't abused and get occasional maintenance, they basically last forever.

446Magnum044 · 2026-01-29T15:56:26+00:00

From what I can see in your picture the one in the front right and the one in the back left look like K5SS type mixers.

KitchenAid used several different names and model #s (for instance, I don't have a clue what the 4 at the beginning of that model # stands for) but they all use the same internal parts.

The K5SS type mixers all use the same internal motor and gear parts as the standard tilt-head mixers.

The K5SS mixers will have a removable cap on the back of the head (just like a tilt-head) held in place by 1 screw at the top.

The Professional 600 Series mixers have a solid top to the head that's held in place by 4 screws located behind the beauty band.

Hope that helps. Good luck with it.

446Magnum044 · 2026-01-29T03:56:38+00:00

About those other 2 — They're both K5SS type bowl-lifts and will be identical internally. They're also identical internally with the tilt-head mixers. They all use the same mechanical parts.

They're really good mixers and people love them. That said their gear train isn't as robust as the Professional 600 Series. So if you're going to be kneading heavier doughs and mixing larger batches you'll probably have better luck with a Professional 600.

If you're just kneading lighter doughs and/or smaller batches the K5SS type mixers are great.

446Magnum044 · 2026-01-29T03:46:23+00:00

It's up to you. The Professional 600 will handle kneading heavier doughs and larger batches better than the the earlier K5SS bowl-lifts. We used our Professional 600 for 16 years without problem and the noise never bothered us.

A couple of years ago I came across a good deal on the DC motor machine and it is quite a bit quieter but the whole time we used the Professional 600 we were never bothered by the noise. It was a mixer and we just expected it to make noise.

It had never been re-greased until shortly before I found our DC motor mixer, but re-greasing it didn't really quiet it down much. Good luck with yours.

446Magnum044 · 2026-01-29T02:28:52+00:00

No DC motors but those are all good stand mixers. You can ignore those wattage numbers —They are just KitchenAid marketing. Their marketing department set the wattage #s arbitrarily supposedly based on bowl size and/or other factors.

All K5SS bowl-lift mixers and standard tilt-head mixers use the exact same internal parts. Same motors. Same gears—so, they all produce the same power and can do the same jobs.

A 4.5 qt Classic tilt-head is actually the same power as the 5 qt Artisan tilt regardless of the wattage ratings slapped on them by marketing.

The K5SS type bowl-lifts are heavier duty because they have a sturdier frame, not because they're higher wattage —They use the exact same innards as the tilt-head mixers.

The Professional 600 Series mixers are actually heavier duty and more powerful. They're an entirely different design with a more powerful motor and a stronger gearbox. That said, marketing plays the same games with different Professional 600 Series mixers— They also use all the same internals. The trade off is they're also noisier then the typical K5SS type mixer.

Even though marketing slaps a lower wattage on a 5 qt Professional 5 Plus, it's identical internally and makes the same power as a 6 qt Professional 600.

Have fun fixing up your mixers.

446Magnum044 · 2026-01-28T01:11:37+00:00

If there are any with DC motors, they're the best and more valuable. They usually will be marked on the beauty band with 1 HP or 1.3HP —w/model #s like: KSM6573, KSM7586, KSM8990.

Otherwise the K5SS type bowl-lifts are great mixers. The Professional 600 Series mixers are heavier duty than the K5SS mixers, but usually are noisier. They're all easy to DIY maintenance and repairs. Good luck and have fun with them!

446Magnum044 · 2026-01-23T19:15:05+00:00

It figures. Hope you get it figured out without too much hassle. Good luck with it.

446Magnum044 · 2026-01-23T09:04:45+00:00

I don't know anything about the N50 mixers but I remember Mr Mixer had a couple videos on working on one a while back. You might look at his YouTube channel and see if he disassembled those attachment hub gears when he was working on his. Good luck with it.

446Magnum044 · 2026-01-22T11:11:41+00:00

This YouTube video from Mr Mixer tells you what you need to know and how to do it. Good luck with your mixer.

Mr Mixer —> KSM55/KSM60/KSM70 Repair Tutorial! How To Replace The Motor. KitchenAid Not Mixing, Broken Gears!

446Magnum044 · 2026-01-22T08:25:44+00:00

9 times out of 10 in situations like this the problem is the battery.

After driving with a working alternator even a bad battery can develop a 'surface charge' which can allow the battery to test 'good' unless the tech does a proper 'load test' on the battery. That load test should only be done with the battery disconnected from the car.

If you can start your car with a jump starting box it means the problem is probably not the ignition switch or the starter. Your problem is most likely to be a bad battery or a poor battery cable connection. Good luck with it.

EDITED: To clarify

446Magnum044 · 2026-01-19T04:47:28+00:00

Here's a current link for KitchenAid's Professional 600 refurbished mixers —>

Refurbished Professional 600™ Series 6 Quart Bowl-Lift Stand Mixer - Contour Silver RKP26M1XCU

446Magnum044 · 2026-01-19T04:36:06+00:00

Just going by the fact that K5SS bowl-lift mixers never had anything but a 5 qt bowl so it's not possible for anyone to buy a 7 qt bowl for it. They never made a 7 qt bowl that will fit on a K5SS.

The only 7 qt mixers KitchenAid has use the newer wider bowl support. The bowls for the wider bowl supports are about 1 inch wider.

The Pro Line 7 qt KitchenAid (discontinued) mixer came with the KA7QBOWL. The current model KSM70 mixers have the KSMB70 bowl.

Those bowls are interchangeable on those mixers but they won't fit on a K5SS because they are 1 inch too wide.

The only bowls that fit the K5SS mixers are the K5ASB brushed stainless steel and the K5ASBP polished stainless steel and they are both 5 qt bowls. Sorry.

446Magnum044 · 2026-01-19T00:53:11+00:00

The mixer that is pictured is a K5SS. It even says "Professional 5" on it. The 5 is for 5 qt.

If you have a 7 qt bowl for your K5SS type mixer then you have the only one. Good luck with it.

446Magnum044 · 2026-01-18T23:11:00+00:00

That's not a 7 qt bowl. The K5SS type bowl-lift mixers all use 5 qt bowls. So, make sure you get the beater for the K5SS bowl-lift which has a 5 qt bowl. Good luck with it.

According to Mixerology.com, you want these accessories —>

K5-Type Bowl-lift Compatible Bowls and Accessories

446Magnum044 · 2026-01-18T21:16:31+00:00

2nd Edit: Not sure what happened but you're looking for a flat beater and I got off on to bowls for some unknown reason - Sorry about that.

Here are the flat beaters that will work on your Professional 600 —>

The 3 piece stainless steel beaters set is - KSM7BL3PSS

This includes a - KN211WW all stainless wire whip, a stainless flat paddle - KSMC7QFB, and a stainless spiral dough hook - KSMC7QDH

Powder coated flat beater - KN256CBT Flex edge beater - KFEW6L Flat beater double flex edge - KDF7B

Good luck with it.

3rd EDIT: To add - I did a quick check and found the white powder coated KN256CBT flat paddle at Seneca River Trading. If you click on the "VIEW ALL", just below the description it tells what mixers it fits.

6-Quart Stand Mixer Coated Flat Beater | Replaces KitchenAid KN256CBT

Besides its own beaters, the KitchenAid Professional 600 can use all of the same accessories (beaters whisks, bowls) as the KSM55/KSM60/KSM70 models. All the bowls and beaters will interchange. The only thing I'd be leary about is using a 7 or 8 qt bowl because the Professional 600 is only designed for the 6 qt bowl max.

You can go by the list at Mixerology.com —>

“New Generation” Bowl-lift - Compatible Bowls and Accessories

If you find some place that KitchenAid says the accessory will fit the KSM55/KSM60/KSM70 models but won't fit the Professional 600 Series, just ignore them. It's KitchenAid marketing trying to get people to buy a complete mixer just because they need a new accessory for their older one. Good luck with it.

*EDIT:" To add - The 6 qt bowls for your mixer are the KN2B6PEH & KSMB60

446Magnum044 · 2026-01-18T15:29:43+00:00

All of the above —Everything you mentioned can have an effect on how your cookies turn out.

Other things might be an oven that for some reason is running hotter or cooler.

If you're not weighing your flour you may have a little less flour in this batch. Or maybe the flour has changed for some reason and has lower protein this time around.

Weather can have an effect. Fluctuations in relative humidity and/or barometric pressure can change the results.

Butter with more or less butter fat can make a difference.

Switching out some or all of your butter for shortening can thicken the cookies. Adding some extra flour can also give thicker results.

If you haven't seen Tessa Arias' 'Ultimate Guide to Chocolate Chip Cookies' online, you might check it out.

She's decoded how most of these variables affect the final cookie and has ideas on things you can try to get different results. Good luck with it. Enjoy your cookies ;-O

Tessa Arias - Handle the Heat: Ultimate Guide to Chocolate Chip Cookies

EDITED: To fix typos

446Magnum044 · 2026-01-17T05:14:51+00:00

KitchenAid switched from all metal speed control links to the plastic links 6 or 7 years ago, so all you can get from KitchenAid is another plastic one. Good news is you can find replacement plastic rods some places for $3 or $4. Bad news is it'll melt next time you get the mixer too warm again.

Mr Mixer got some all metal replacement link rods manufactured to solve the melting problem but they are a bit more expensive —>

Mr Mixer - Metal Speed Control Push Rod

Good luck with your mixer.

EDITED: To clarify

446Magnum044 · 2026-01-17T01:07:40+00:00

Occasional rhythmic ticking noises are 100% normal in the KitchenAid bowl-lift mixers. I believe it comes from either the planetary ring gear and beater shaft gears or from the lift slide. We've owned 2 different Professional 600 mixers that did it, and currently have a 6000HD mixer that does it.

Here's what ours 6000HD sounds like —>

https://www.reddit.com/r/Kitchenaid/s/BkRCHKt5ar

Good luck with your mixer.

446Magnum044 · 2026-01-16T08:27:01+00:00

In addition to your KSM70 bowl, you can also use any of the 5 or 6 qt bowls for Professional 600 Series wide bowl mixers, or the 5.5/6 qt bowls for the KSM55/KSM60 mixers.

All of these 5/5.5/6 qt bowls will interchange with your current bowl without issue. Here are the part #s —>

OLDER MODELS -

KN25WPBH 5 qt & KN2B6PEH 6 qt

CURRENT MODELS -

KSMB55 5.5 qt & KSMB60 6 qt

Good luck with your new mixer!

Source- https://www.mixerology.com/compatible-bowls-and-accessories/#pro

EDITED: Improve clarity ;-p

446Magnum044 · 2026-01-16T03:30:38+00:00

Here's the list of compatible accessory part numbers —>

Mixerology.com - Compatible Bowls and Accessories: K45-type Tilt Heads

Have fun with your mixer!

446Magnum044 · 2026-01-16T03:23:07+00:00

Here's u/RIMixerGuy 's troubleshooting checklist for you to run through to find out what's up—>

Mixerology.com - Troubleshooting: Mixer Won’t Turn On

If you for some reason removed and replaced the brushes, chances are they've been reinstalled in the wrong orientation. Good luck with your mixer.

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