Question about Bosch 4000 - 07 Electric Table Saws

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My 4000 started running backwards very slowly - is it a field winding or maybe the speed controller? And if it is the speed controller, where is it and can I bypass it to test it?

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I am not aware of any speed controller on this tool. what I would do is unplug tool and turn it on its backside and look at the switch to see if possibly burnt causing problems.

Posted on Aug 26, 2010

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Runs fine on low speed hums on high speed (turns slowly) is it a capacitor problem, internal windings or controller?


Motor itself is the culprit.

Capacitor helps the motor to start spinning from a dead stop, so NO, it is not a capacitor problem.

Probably high speed windings. Means - New Motor needed.

Another possibility, is the controller could be sending power to "Both" sides of the windings: High speed & Low speed at the same time. But normally when this happens, you hear a loud buzz type of sound, motor will spin slowly - if at all.

Good Luck

Mar 11, 2015 | Pool & Spa

1 Answer

Bosch 4000 table saw motor schmatic


http://www.ereplacementparts.com/bosch-4000-0601476139-table-saw-parts-c-128_167_168.html
I have found the most common issue is a bad field with the second being a bad rear armature bearing and last being a bad speed control.
Most of the time slow speed or even running backwards is a bad field (part #2 on the breakdown) #1619PA5590
Remove the cap on the end of the motor & the 2 carbon brushes.
Remove the 4 screws holding the motor to the frame and pull it straight off.
Check the bearing on the end of the armature to ensure it is not frozen or stiff. If it is also check the rubber boot that sits over the bearing and the motor housing itself to ensure it is not melted.

Dec 18, 2013 | Bosch 4000 - 07 Electric Table Saws

1 Answer

Bosch 4000 table saw wont power on


The field is notorious for failing in these tools -
If you remove the cap on the field housing you can access the field wires - check to see if you have continuity through the field windings.
To further investigate
1) Remove the brushes and inspect them for excessive wear or chipping (If they look burnt or are chipped the armature is suspect)
2) Remove the 4 screws holding the field assembly to the saw frame
3) Pull the field off and inspect the armature (especially the commutator (copper segments the brushes ride on) for burnt or raised segments or windings.

Dec 11, 2013 | Bosch Work Site Saw 4000-09 With Gravity...

1 Answer

Bosh 4000 table saw runs backward and at low speed


I've worked on some table saws with problems like you describe, a couple needed a new speed control unit (Bosch PN 2610997306) in the motor. If all the wiring to and inside the motor is OK and not shorting out anywhere, that's the next part you should look at.

Jul 10, 2012 | Bosch 4000 10IN Table Saw

1 Answer

Bosch 4000


The speed control on your table saw works by sensing what's going on in the field. If you replaced the speed control circuit board and the motor still runs out of control, the next item to replace is the field.

Feb 10, 2012 | Bosch 4000 - 07 Electric Table Saws

1 Answer

Just replaced speed control unit and saw still spins at very slow rpm, guessing 20-30. any other possibilties. any way to check if new control unit is no good?


With the saw unplugged, turn the saw blade.
If it turns easily with no hangups I would guess its the field.
When mine went bad the blade went backwards very slowly.
I replaced only the field and not the armature and it's worked fine for over 2 yrs.

Right now I have it apart to change an armature bearing which was completely frozen up.

Aug 29, 2011 | Bosch 4000 - 07 Electric Table Saws

2 Answers

Bosch 4000 table saw run backward and slowly


I had the same problem with the Bosch 4000.
Changed the field for a new one...end of problem

Apr 28, 2011 | Bosch 4000 - 07 Electric Table Saws

1 Answer

Bosch 4000 Table Saw running backward


You can find the 4000 manuals and parts diagram at bosch tools online. You will need a new armture Bnew bushes and possibly field. I would also replace the bearings and motor speed control circuit board.
Bosch does not sell the motor assembly.
Turn unit upside down and remove the Plastic body - approx 6 screws.
Thake a digital camera and take LOTS of pictures of dissassembly as you will need them later. Blow unit clean and work neatly keeping all parts in labeled bins for reassembly. Don't attempt this job when your pressed for time.
Before you start check to see if this machine is still under warranty!!
Call customer support listed on website if you run into a problem.
Good Luck !!

May 19, 2010 | Bosch 4000 Factory Reconditioned 10"...

1 Answer

My bosch table saw runs slowly backwards what part do i replace


Replace the field coil. I'm going to bet its a Model 4000. I have done about 100 of these saws in the last couple of years and my customers always complain of the same problem, "the saw was running backwards"

Change the armature back bearing while you have it apart, they always seize eventually.

Jun 23, 2009 | Bosch 4000 - 07 Electric Table Saws

1 Answer

Makita LS1013 miter saw motor runs very slowly


Could be a bearing problem. If the bearings are dry and seizing up they will hinder the motor speed. Alternatively, if they are worn and allowing lateral movement in the motor the armature will rub against the field windings when it all magnatizes (sp?). I would investigate bearings before electrics. Hope this helps, good luck.

Nov 24, 2008 | Makita LS1013FL 15 Amp 10 Inch Dual Bevel...

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