Question about Hobart D300 Stand Mixer

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Shaft stops spinning in first gear when load is put on it, all other speeds fine.

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Here's what you need to do first. Check and make sure the bottom nut on the agitator shaft or planetary shaft is tight (This is the part that the attachments afix to). NEXT, take off the lid exposing the top area. THEN tighten up the largest nut (TIGHTENING is in reverse! SO - TO tighten turn nut to the LEFT). When the nut is tight, then turn on the mixer in 1st gear. IF you still do not have 1st gear, then turn off unit and THEN loosen (By turning to the right) this nut by a 1/4 turn or so, then turn on mixer again -- check for 1st gear. If after loosening this nut to where there is no resistance at all and you still do not have 1st gear, then you may have a sheared KEY on one of the gears that controls 1st gear! Did you hear anything pop or break before this happened? Let me know.

Posted on Apr 23, 2014

Testimonial: "It was helpful but it did not correct my concern. Is there any chance the gear selector assembly could be at fault ?"

  • J. Hobart Tech Aug 27, 2014

    I'm really sorry -- I misread your concern. You clearly stated that 1st gear was working, but not under a load -- You have a sheared Key on your Transmission Shaft -- This is the shaft that is opposite the worm gear (brass gear) shaft. Take top off of the mixer and then carefully pull out the bevel gear so you can carefully pull out the Trans shaft -- at the very bottom you will find that that bottom gear has a broken key -- replace and assemble in reverse order -

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1 Answer

KitchenAid Mixer struggling to spin?


Check everything you have done for a mistake, the pin through the planetary, the pin through the fuse gear and the pin in the main shaft that drives the bevel gear. That's the gear that pinion gear on the fuse gear shaft mates with. After that you are left with a fuse gear fault. I am assuming that the motor is turning at normal speeds and not somehow binding up, no reason why it should as motor stays in one piece during gear changing procedure.

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The first vertical shaft has a brass gear that runs off the rotor. The ancient models had a spring loaded slip clutch built onto the gear. Upgrade it with a worm shaft kit which gives you a complete new shaft and fixed gears. I think it includes the upper and lower bearings. Maybe replace the grease if it has not been done. Or look for a sheared key on the worm shaft.

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It is not going to be a problem with the motor. It is going to be a chipped/damaged gear, a bent planetary center shaft pin, or possibly the planetary itself.

The first thing you need to do is take the mixer apart. You are going to have to clean of all of the gears and inspect them very closely. I recommend using paper towels and wd-40. If there is any damage, the gear will need to be replaced, in some cases the pin that sits between the worm follower gear and bevel gear can become bent, if it is, it also needs to be replaced. If all of the gears, bearings, and the pin are in perfect shape inspect your planetary assembly. In some cases the center shaft, which is pressed into the planetary can become loose, so it will still spin under no load, but as soon as you put something in the bowl it stops spinning.

Here is a link to the KitchenAid service manual. This will walk you through how to take the mixer apart, and put it back together: http://lib.store.yahoo.net/lib/mendingshed/kitchenaid6qtservicemanual.pdf

Please let me know if you have any questions, or need help with the repair.

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2 Answers

Hobart D300 is stuck in speed 3, any ideas?


Best guess is that the gear for 3rd speed is seized together with it's brass bushing and the center, large transmission shaft. I don't recall which gear is for 3rd, but the transmission has two gears (2nd and 3rd speed) which have brass bushings in them. The brass bushing should spin freely on the center shaft (when in final position - sometimes they pull off the shaft tough, but spin freely when in final position, my opinion is that this is OK), and the gear should spin freely of the brass bushing.
My guess is that the 3rd speed gear, being seized to the center shaft, cannot freely idle on the center shaft, which would result in being stuck in 3rd gear.

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4 Answers

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Loosen the two planetary nuts, should be a thin nut and an acorn nut. With these loose make sure the large nut on top of the transmission is tight. Push the planetary all the way up on the shaft and turn the thin nut up until snug. Back the thin nut off 1/4 turn. Hold the thin nut in position and lock the acorn nut against it. The planetary must have a very small amount of up and down play.

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Check the spring pin that locks the motor shaft to the main drive gear in the gear box. You should be able to turn the motor from the back at the cooling fins and watch the shaft spin in the gear, that is if the pin is sheared. That is a common problem. if you plan on keeping this machine for a while, i recomend that you spend a little more on a quality spring pin,

mechanictony-
good luck.

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1 Answer

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sometimes you read of other problems and solutions and it puts you at the edge of your seat. in this case of changing the worm gear on the A200F was cake. when you drop the lower end (3/4 acorn and jam nut), pull out yoke (speed select handle) the center transmision shaft and gears pull right out.worm gear easy to change at this point. if you can change a motor bearing, then you can do this job. Note: change seals and bearings as needed,check all gears,keys and spacers for wear and if you go the mile take gears off drive gears, these are the 2 smaller trans shafts put in lath if you have accsess to one if not roll shafts on flat surface to see that shafts have no bends in them. Also remember when you put the bottom back do not over tighten the jam nut,hold and lock acorn nut, should spin free and have about .016 to .030 movement up or down. Lay out all part on cardboard the way they came out. should go back together easy.

Harry Ooooooooooo

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2 Answers

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When you say lag and catch up. This may not be a issue. I have seen this with dough and a spiral hooks on all sizes of Hobarts the hook and dough get in a position to push the hook forward and the drive gears catch back up the hook. in fist gear on the 20 quart this is common for sure. but its normal. if you have a real slip from a sheared key it will not take long to where you can hold the planetary shaft with your hand and stop it. another slip that might be possible is if your mixer has the first generation worm shaft gear Assembly. when it is worn out it will slip you. this is the shaft that drives directly off the motor. you can tell if it's first Gen by it has a large spring on it. the tow later versions are all keyed to the shaft no chance to slip unless a key shears.
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