Installing brushes in porter cable 7336

im holding an oreck motor as i write this and to the right of where the plastic casing that holds the brush there is a small round plastic piece sticking up, around that should be a metal coil which slips over the plastic piece the theres a piece of the metal wire on one end is the coil the other end is like a hook which hooks into the plastic housing piece causing a sort of resistance, like a spring action. good luck

You might have let the brushes go to long and they are worn so far that they came out of the holders. Maybe try turning the blade backwards while pulling on the brushes.

Heavy sparking at brushes indicates shorted armature or short in field. Examine commutator bars, should look dark gray to black but very smooth. If scratched or pitted most likely end of life. If not too bad could be weak brush springs or worn brushes. Brushes should be at least 1/2 to 3/4 in in length. If commutator and brushes good , suspect field. Good luck

On one brush holder you push the clip on the end of the field wire between the bottom side of the square brush holder and the black plastic insert the holder is mounted into. On the other brush holder it pushes between the top side of the brass holder and the black insert. The bearing is pre lubricated but oil the armature shaft before sliding the rear bearing housing on.

http://www.ereplacementparts.com/skil-3400-f01234000a-table-saw-parts-c-130_164_7498.html
Here is the breakdown - I believe the brush tubes just friction fit with the wire connected by a spade terminal.

The brushes are on the front and back of the motor, under the top cover. Remove the four screws on the top cover and remove it. The brushes are held in place by a coil spring, pull it back so the brush will slip out. Some brush leads have slip connectors and others are held in place by a screw, depends on what type router you have. Disconnect the brush lead then reverse the process to install the new brush.

this tool has various type numbers but I checked on the type 5-6 and came up with the same number. the brush number I found is NO30461 and they run from around 3.50 to 4.00 each. If you have removed the brushes if the spring is burnt/collapsed it could have been from a loose brush cap or worse an armature problem. Before I sent it out for repair I would look at the brushes, UNPLUG tool first and remove them after removing look into the brush holder and see if the commutator (part of armature you can see) and see if it is discolored or other obvious imperfections. You can buy replacement brushes online from "ereplacementparts.com" or direct from "dewaltservicenet.com". Let me know if you need more assistance before voting and thank you.

Hi, ANNEQUESTRIA, I hate it when that happens. Those ‘two big black plastic spring loaded screws’ are your mixer’s electric motor brushes. The slotted black threaded plastic parts are just the Brush Holder Caps and are protective covers to the brush holder assemblies. They allow access to the brushes when they need to be replaced without have to take the whole mixer head apart. What prompted you to remove them?
From what’s been done already, still I suspect that one or both of the brushes is (are) not seated properly.
The brushes need to be installed so that they both seat correctly on the armature's commutator. See the illustration below:

I'd suggest removing them again and making sure the concave contact face rests completely on the armature’s commutator. If you've turned it 90 degrees too much, it won’t seat properly and you get no power to the motor.
It would also be helpful to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number, in your case use KSM50P (Your KSM90P mixer falls within this manual), and select the last file KSM90PSWW0.pdf (354.08 KB) listed under Parts List (16) and then check to verify this matches your mixer model.
Turn to pages 6 & 7, titled “Motor And Control Parts”, which provides an exploded view for the disassembly and reassembly of your mixer’s electrical components, along with all the parts. Locate Illus No 32, Brush holder assembly that includes Illus. Nos. #18, 21, 22, 23 & 31, and Illus. No. 19, Brush & Spring assembly respectively.
The Parts List illustration along with the picture above regarding the orientation of the brushes should get your mixer powered back up and operational. Good luck! I hope this helps. Howard, Burke, VA
If this solution has been helpful to you, please rate it, thanks! -hslincoln

you need new brushes or clean out the holes they go in so they move freely

The first thing to do is to make sure the unit is completely clean. Many of the contaminates that get airborne while you are sanding can and will affect the motor's performance with time. Pay particular attention to the brushes/commutator or any kind of centrifugal switch it may have.