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the ML or spec number would be trackable from the resource site.
Enter the model number and check the date of the corresponding build number. https://my.hobartcorp.com/resourcecenter/Pages/FilterByModel.aspx
If it does not have a safety cage fitted, there are some areas of the countyr where it can not be used commercially, untill one is fitted. Depending on the model, that would be a thousand dollars or more.
The precise model number and ML number would be helpful. It would tell if you have a safety cage and bowl height sense switch. There are huge differences between a D300, and an HL300. If you do have the cage, and nothing works, I would suspect you may have lost the magnet from the safety cage. Golden rule of trouble shooting is, "What has changed"
The ksm90 mixer has been being produced for many years, the only way to find out when your mixer was made is to call KitchenAid with the serial number. They should be able to let you know when the mixer was made.
No change available. The motor speed if fixed and the 3 speed transmission has fixed gear ratio's. Look at the new HL300 model. It has a stirr speed which is slower than first speed.
Does your mixer havea safety cage? If not, you will need to install one before too long , or the machine will not comply with current safety standards. Put the cost of the safety kit towards the HL300.
I'm a service tech for hobart,I'll type your serial number into our database and see what it brings up.The changes that have been made---older units use a mechanical start switch on the motor,the new units use an electronic start switch.the old units center shaft and gears have changed.the older units dont have bowl guards and the new units do.(this is a cage that goes around the bowl).The gasket that your talking about is just that--a thin paper.The paper wears and you get that symptom you describe and its normal.I'll get back to you.