How do i get the top of the mixer off to fix the gears? i'm unable to find a way to remove the lid.

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.

The Legacy is an electronic mixer and the transmission does not have any gear, and it frequency convertor that works in phases 2 and 3. If the hook struggling when turns, check the transmission belt locasted at the top of the mixer, remove the cover first.
If the belt is loose, tense it with the screw on the base of the motor or replace the belt. If you can not fix it, let me know and I'll try something else.

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.

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.

Well I afraid that you will not like the answer. The locking latch on a tilt head mixer can only be fixed replaced or repaired by taking the motor head apart. The bottom from the top.

1 remove mixer from stand
2 remove silver drip ring
3 remove rear end cap
4 remove locking pin in the planetary
5 remove planetary
6 remove nine screws in bottom of mixer
7 separate top from bottom of motor head
8 do not tear gasket or you will have to replace it (buy on line)
9 inspect locking latch and tighten or replace as needed
10 check gear grease and replace if all hard or all runny
11 reassemble

Sorry this is not an easy fix but it is do-able. You will need throw away rags a nice flat work space and some patience. I f you have never done a mechanical fix to anything it should take you about two hours, if however you are mechanically inclined and not afraid to tackle new projects should take you about forty-five minutes. let us know if we can help you.

I repair mixers and this model eats the metal gears like they are going out of style. If you remove the chrome band and the four screw holding the top on you will be able to remove the top. Towards the front of the mixer is the transmission cover. Hopefully your's is cast aluminum and not black plastic. Remover the cover and examine the gears. You will probably see gear next to the worm gear is severely worn. Be careful about ordering new gears. According to Kitchenaid they changed the teeth on the gear and the new gears will not work. The old gears are not available either. The fix is complicated and you probably want to send it in for repairs, then sell it.

Most likely what has happened is that the gears have stripped. The gears inside are plastic but the spindle is metal. When a dough is too heavy and gets caught up in the beaters it tends to eat them. If you take it apart, you will probably find that the gears are shot.
The fix...order new gears, tear down the mixer and replace them. These gears really should have been metal! Check the sunbeam web site for authorized repair places to get your parts.

1. Remove the ejector button...it should pop out with a flat head screw driver. There is a small phillips head screw under it. Take it out.

2. Take out the screws on the bottom. This should allow the face plate on the mixer to slide off, allowing your motor assembly to then be pulled forward.

3. Remove the mounting brackets/shock absorbers...they are rubber u shaped items that hold the motor in. Once that is done, remove the black plastic bracket on the bottom; two phillip head screws. Then unscrew the two long screws underneath. they hold on the speed control electric board as well as the top to the gear box. Pop the silver fasteners on the side of the gear box and you are in. the gears should lift out. put the new ones in and do the whole thing in reverse.

hope this helps.

You have broken the intermediate gear in the head. This gear can be a bit of a problem to change. Here is the parts manual for the KSM150PS.
The part is probably #6, worm gear.
Check with Kitchenaid on where to buy parts.

To the best of my knowledge that is a reduction drive / direct motor connection mixer. No belts just bearings and gears. It has been far too long and I honestly can not tell you how to remove the cover. I do remember that were screws under the chassis of the motor / gear section. Real bad case of long time no do... here. You might have to remove the drive head to access the top cover screws. Wish I could have been more of a help. Just in this case it is one of those it needs to be in front of me things.

I called KitchenAid about this issue with my mixer. The agent on the phone told me they are aware that it tends to happen to some mixers after they sit for some time. Basically, a "lifetime" of grease has been packed into the assembly and it is normal for it to release grease on occasion. I was told to run the mixer at 10 for at least 2 minutes to get it going and I should see a reduction in the oil leak. I had about a tablespoon worth of oil dripping down off the assembly. I was told that if over time it seemed to amount to about 1/4 cup then I should call to see about repairs due to a potentially bad seal. I was also told that the repair for that would most likely NOT cost the same as a new appliance.