Re: Hi, my Hobart D300T is making a really loud buzzing...
Could be a problem with the start windings.or start switch.maybe a capacitor .on the older models the start switch sticks just needs freed up and contacts on start switch cleaned.
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call in an electrician as it may be the start/run capacitor for the motor ( indicated by motor humming but not running)
the gearing will make it very difficult to turn the blades by hand as the motor will be spinning at either 1400 rpms or 2400 rpms down to around 50 rpms for the blades
If the mixer is still running and making the buzzing noise one of the electrical contactors is making the noise and should be replaced. If the mixer is not running and just making a buzzing noise it can be because off single phasing, check the incoming supply to the mixer and make shore you get the right voltage to the motor (test on motor connection terminals)if the voltage to the motor is right the motor might be faulty
Weird sound usually means something in the gear box. I found a copy of the manual which includes many exploded drawings; perhaps something in here might help:
http://www.bakedeco.com/ebay/pdf/HobartD300.pdf
Have you try to run the motor without engaing of worm gears? The worm gear 15T assembly need to remove in order for motor to run freely. check worm gear attach to motor shaft for any damaging.
Hi. Go to hobartservice.com, register for free. This will allow you access to the parts files for your D300T mixer. Download them. When you begin your disassembly, take a photo of every piece that you remove, lay these pieces on a piece of cardboard or something suitable in the order that they were removed. This will help you greatly with your project. Good luck! ricardok45
You can put in a all purpose grease. I use MOBIL 1 Synthetic Grease (RED IN COLOR) and it works fine -- you will need 3 tubs of 16oz's each tub. The cost is 30.00 or so. Make sure to get all of the old grease out and pack around each of the trans and worm shafts with the grease, then pack around the MOTOR GEAR and then put all back together. While running it make sure you can see the grease and hear the noise of the mixer through the 2 caps that are FILL caps on the head of the mixer. ALSO, you will find that you will lose 1st gear IF you have tigtened down too much on the LOCK nut, SOOOO loosen in small increments until all 3 gears are perfect and strong. ALSO, the key to noise adjustment is to Tighten (WHILE MIXER IS RUNNING) slowly the large nut that controls pressure on the worm transmission. The general rule with tigtening this nut is to tighten it till it will not tighten and then back off the nut -- IF the unit when starting does not run or it seems bound up when you first turn it back on, THEN you have tightened it TOO MUCH, SOOO back it off again (loosen it) until it starts smoothly and when you turn the mixer OFF it should come to a slow stop and not abruptly stop the mixer. Hope this helps some of you out there trying to do your own adjustments --
You may have a wire not fully seated in your plug, or the worm gear you've just replaced is bound by something ( a gear tooth?) or wrong worm gear. Check to see if all the gears are seated properly. You should be able to turn the agitator by hand. If not, something is jammed in the gears. The other possibility is the windings in the armature are bad.
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