D300 I have a d300 with might be a sheared pin. A customer switched gears on the fly and it quit rotatting. I don't know how that assembly comes out. I have the bolts out of the top of the assembly but it does not budge and I am afraid to try and force it. Can you help me with some guidance or point me to a how to diagram? I would appreciate any help. Mark [email protected]

From what I know about these and industrial Hobart mixers is that where drive gears are on a shaft they are held by a shear pin that goes right through the gear and the shaft. They are made to shear if the grinder or planetary head is strained. It shears the pin instead of damaging the motor or shredding gears. When they do shear, there is often enough friction to turn the attachment, but not enough force under load. I see two shear pins in this diagram 19/8 and part 14/8. The diagram also show the orientation of bevel gears.

https://www.google.com/search?q=olympus+s924+manual

A Moulinex Coffee Mill might be a better solution for grinding wheat.

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You probably just need a new Shear Pin. This is just a small steel pin like a nail that goes through the gear and the drive shaft. If the strain on the final drive exceeds specs, the pin shears through and thereby saves damage to the gears and motor.

Google

make model parts diagram

https://www.ereplacementparts.com/kitchenaid-4ksm150psbw0-artisan-tilt-head-stand-mixer-parts-c-114958_114959_115458.html

This is one of the Shear Pins. They just call it 'pin, retaining'.

https://www.ereplacementparts.com/shear-pin-retaining-pin-p-621981.html

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I don't think they ever made a video for that.
The grease in the D300 is sticky and runny, and has to be removed out the top once the bearing plate is removed. On the top of the main shaft is the first gear cluster and a bevel gear beneath it. If necessary, use a pulley, BUT KEEP IT AS ONE ASSEMBLY.
Once it's out, the rest comes apart easily. Just lay out the components as you find them. Clean and inspect.
The first gear is made of the bevel gear as a base, a center hub with an outer ring gear, and a stepped cover on top that sits under the top bearing. Between the ring gear and the hub are 10 rollers and spring plates which bias the rollers into the shallower end of each roller seat.
You can get instructions and diagrams here.
https://my.hobartcorp.com/resourcecenter/Pages/FilterByModel.aspx
search model number d300. near the bottom of the options is form F-3492-N. That has detailed instructions for the older version.

Sounds like the keys in the shifting sleeve may be sheared. The transmission will have to be disassembled and checked for broken parts. Check www.hobartservice.com for your local Hobart office.

sounds like you have a sheared key in one of the gears. which speed is it slipping in or is it all 3speeds

drive gear or shear pin stripped. Common on this model. Return to repair centre. Expect to pay approx $150.00 to repair, sorry.

Sounds to me like the shifting yokes are locked up,or a broken shaft.Is there any noise?

in what speed?any noise?what were you mixing?it may be a sheared key or broken gear.let me know.

you have no speed 1,2,3 right?first thing to do is drop the planetary (this is the bottom with the beater shaft)undo the bolt and it will drop down.you will see 1 gear,that gear should not spin without the shaft spinning too.if it does you have a sheared key on the gear.if you have access to the transmission check the worm gear attached to the motor it has a roll pin through it make sure its not sheared.then look at the top left gear assembly and check for sheared (broken)keys.clean up all the parts,if you dont you could miss something.let me know.

http://www.food-equipment.com/parts_Hobart_mixers.htm About halfway down. Hope this helps :)