Happened suddenly.. motor start makes awful noise and does not roatate. Does not kick breaker. Blade cannot be turned by hand or with tool pressure. Blade removal lever seems off.
Possibly something has jammed inside the motor housing although unlikely.
Electric brake seized perhaps?
Carbon brushes need replaced?
These saws (and the newer 4100) have a history of motor problems, with the field winding and electronic motor speed control being the most common points of failure. If you go to an online tool parts supplier like toolpartsdirect- Bosch 4000 saw you will see a list of the parts available, as well as the most commonly ordered parts.
Thanks go to Jason for his blog post at:
http://mypeculiarnature.blogspot.co.uk/2013/07/bosch-4000-table-saw-fix-momentum-lost.html
Testimonial: "thks for your interest and time. DIY seems nearly dead these days. my problem ended up being brush end bearing seized by small particle. Working fine now."
We are a dying breed, those prepared to get their hands dirty so their smiles can be broad when it all works!
My Bosch 4000 suddenly lost power while ripping and would run at only 1/3 speed. I did everything Jason recommends in his blog at:http://mypeculiarnature.blogspot.co.uk/2... I tried TWO new speed control boards. All that TLC and saw only running at 1/2 speed. My 2703 Makita saw from the early 90's does not have a speed controller and I have NEVER had to repair it. It has been abused a thousand times more than the Bosch with it's slick folding stand. I removed the Bosch speed controller and the saw has been running at full speed for about 3 months now. 1.)Take black plastic end cap off of motor. 2.)There is a black wire running from the speed control board up to a spade connector on one of the brushes. Permanently disconnect this black wire/spade from the brush. 3.)There is another black wire coming out of the motor. (This wire is connected to the field wiring in the motor.) It is connected to the black wire coming from the controller. Disconnect these wires. 4.)Disconnect the black incoming power wire from the blue wire on the controller. 5.)Use needle nose plier to squeeze the plastic power cord retainer and push it back out of the hole. Remove the speed control board.Reinstall the cord retainer. 6.)Connect the black incoming power wire to black wire coming out of the motor. (The wire connected to the field wiring in the motor.) 7.)Reinstall end cap on motor. 8.)Your saw will run just fine.
RE: sparking. When new carbon brushes are supplied, the end of the brush needs to be shaped to fit the arc of the commutator. This process is called ‘bedding in’. New square end brushes have not been shaped at all and the current can only pass through the small area at the centre of the brush, which has caused the sparking and brush wear.
To ‘bed in’ the brushes, it is necessary to place a strip of abrasive paper over the commutator and under the brush, with the abrasive side facing the brush. (I used 400 grit.)
The brush is held with pressure against the strip and the paper moved back and forward by hand until the shape has been formed. This must be done for all brushes and then the excess carbon removed from the motor. Look here:https://www.mawdsleysber.co.uk/case_stud...
×
If the motor does not turn, it SHOULD TRIP THE CIRCUIT BREAKER. The blade is gear driven directly off of the motor. The gear box (front of motor) is most likely shelled. Also the is a blade lock for blade removal. If you are very, very luck, it could be the blade lock is engaged.
SOURCE: Bosch 4000 table saw disassembly
turn the motor housing slightly until you can put a screwdriver between the housing and diaphragm, pull on the one side and push with the driver and it will come apart, I just did one yesterday. To get the armature out of the fan bearing you will need a dead blow hammer to tap on the diaphragm while pulling on the armature. The bearing is held in place with 2 screws, hope this helps.
Testimonial: "Hey thanks! It seems they really don't want you to work on the motor on this particular saw. Thanks again for your help. "
SOURCE: My Powermatic 66 table saw won't start.
Your saw motor is equipped with a two speed internal start switch. Over time saw dust will get into the contacts and cause the points to burn. You can pull the end off of the motor and take some 400 grit sandpaper to the contacts to clean them( there are two sets of contacts one works in the out position the other in the in position) it will be the set in the in position that is the problem. Gentle clean them, reassemble the motor end cap and it will work fine. I have to do this about once a year to my saws. I use my saws about 25 hours a week. I have been doing this to one of my Powermatic saws for 31 yrs. now.
SOURCE: My Skil Saw 10 will not start now.
depends wether the saw is belt driven or gear. just because you cant hear the motor doesnt mean its not running.
SOURCE: will the skil 80092 table saw stand accomodate the
Yes it will hold the Bosch 4000 with a little modification.
Testimonial: "Do you know what modifications i would have to make ? It would be of great help to know what i'm getting into before i purchase the stand!! Thanks "
If armature and brushes look fine my guess is you have a bad field (very common problem in this tool) #1619PA5590
4,742 views
Usually answered in minutes!
WD40 around blade end of shaft and in side of blade lock which was not engaged but something started to loosen up as now it runs but very noisey like a bearing.
60 plus years of life and never had a bearing not make some comment before it seized completetly.Add a Comment
It is a gear motor. Noisy gears. I sent mine to the Bosch repair center in Texas. Mine cost more than the saw was worth to repair it. BTW beariings can and do make noise prior to seizing but in this case it's probably the gears.
×