I surmised a bearing issue and validated my idea via internet searching for Bosch T-4000 table saw maintenance, finding several articles on bearing, brush, armature, and field replacement, but no articles on performing bearing lubrication or maintenance. e-Replacement had very good diagrams of the saw and saw motor, so I removed the motor
... Read more and found the bearing on the commutator end of the armature badly burned and rough, the rubber ring melted and the end of the motor housing melted. I ordered the parts and when they arrived, I replaced the bearing, rubber cap that holds it securely in the motor housing, the housing itself, the brushes (even though they looked to be in fairly good shape and just slightly chipped on one edge), and transferred the necessary parts from the old housing.
The armature and the field both had a thin layer of the melted rubber ring and the melted end of the housing over much of their metal surfaces which I carefully sanded off with very fine Wet-or-Dry sandpaper (armature and commutator) and a cylinder hone (for the field).
The hardest part was fitting the motor housing end cap back onto the motor housing due to the very limited space and getting the wires and butt-joints into their exact locations so that the cap fit back on and seated into place. I used an old bicycle spoke to prod the wires and butt-caps into place to get everything aligned. Take a picture, take notes, or make a drawing of how the wires fit in the cap if or when you remove it from the motor housing to save yourself the time it took me.
I have now ordered the other 3 bearings in the motor, though the rest seem okay and I was able to carefully pry out the seal from the other armature bearing and refill it with grease before putting everything back together.
I will also try to seal any excess holes in the housing for the vacuum port so that I can keep the motor cleaner. I will also always connect a vacuum hose from my Dust Deputy and shop vac when using this saw to keep sawdust out of the motor.
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The rear bearing on the armature seized and the resultant heat melted a section of the motor housing causing the table saw to lock up.
Bosch 4000 table saw repair. Remove the rear motor housing (3 Phillips screws) then uncrimp the 3 wires attached to the field winding/carbon brushes. The next step is to remove the four phillips screws that hold the motor housing to the inner gear box. Pull housing towards you to remove. I used a gear puller to remove the bad armature b
... Read moreearing, then proceeded to degrease and clean the armature with electromotive cleaner. Reassembly is the reverse of disassembly.
1. Removed the bearing.
2. Cleaned out the armature.
3. Installed the new bearing.
4. Installed the new brushes.
5. Installed the new motor cover/casing.
a local industrial tool repair shop had the needed bearings instock , removed and pressed on the new parts . e replacementParts had the housing in stock. My order was shipped and received in a couple of days,I completed the repair, my saw is back up and running. Great reliable service as always. I am a repeat customer . Thanks !
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The rear bearing spun and burnt the motor housing seat out of round.
I had to remove the motor from the saw. Remove the armature, disconnect the field wires and remove the field, Remove the bad bearing from the armature shaft and replace it with a new bearing. Install the field and rewire, install the armature in the housing, and install the motor to the saw. Repair complete.
The only tricky or hard
... Read morething with this repair is reinstalling the speed control board and rewiring. You have to use the same size small wire nuts when you rewire the field and brushes because you have very tight tolerances.
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
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