Question about Bosch 4100 09 10" Worksite Table Saw W/Gravity Rise Stand

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Bosch 4100 Table saw w/ soft start motor.. runs backwards at slow speed..., pulled motor out, full votage on leads from switch voltage from govenor out put to neutral = apox 20vac, Brushes good Armatrue winding ( Brush contacts all appear to be shorted) This is not normal is it...?? Is Goveror voltage Normal..??

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Posted on Jan 02, 2017

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comax
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SOURCE: I was cutting 2" dense foam insulation board,

The problem you have is a faulty field coil, the Bosch saws unfortunatly have a bit of an issue with this. The coil can be replaced separatly so you won't have to replace the whole motor. Bosch has a 1 yr warranty on thier table saw so this is a warranty replacment provided the saw was purchased within the year. If not the coil replacment is still cheaper than buying a whole new saw, but should really be done by a service center because of the level of difficulty of the repair.

Posted on Jan 14, 2011

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1 Answer

My bosch 4100 lost power and the blade started running backwards. what went wrong and what parts do I need to order to fix it?


for an electric motor to run backwards it requires a current direction change in the fields
as that is not possible unless there is a direction change switch as in a reversible drill there is a major fault in the motor windings
take it in to an appliance repair shop for a proper diagnosis and quote

Dec 01, 2016 | Bosch Saws

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

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

Motor turning at very slow speed.


It sounds like the field coil has failed and must be repalced. Those saws have a 1 yr warranty on them, even if its off warranty it is still cheaper to repalce the coil than the saw. Just find a Bosch service center in your area they can help you out.

Corey

Feb 15, 2011 | Bosch 4100 09 10" Worksite Table Saw...

1 Answer

Motor starts then stops i'm thinking bushings in motor


There could be two issues here there is whats called a soft start module in the motor that could be causing you problem, when the motor gets up to speed it shuts off, replacing the module will solve that proble. Or it could be the rear armature bearing has seized, usually they seize so tight they will stop the motor rotation.

Dec 28, 2010 | Bosch 4100 09 10" Worksite Table Saw...

1 Answer

It will start but it's turning really really slow


If the blade spins up fairly quickly to about half the speed, then doesn't go any faster, then there is a problem with the internal switch of the motor (that shuts off the start capacitor). But, if the motor humms and doesn't really spin up the blade (it should get going if you can spin the shaft fast enough - don't do this with your fingers!) then it's the start capacitor.

The start capacitor is usually mounted on the side of the motor in a sheet metal case - DISCONNECT ALL POWER TO MOTOR BEFORE SERVICING! remove the motor from the saw and open the long wart like case that hold the start capacitor. Discharge the start capacitor by using a plastic handle screwdriver (touch only the plastic and not the metal part of the screwdriver) and touch the 2 leads of the start capacitor together. Remove the wires from the start capacitor (good idea to mark these so you don't mix them up). Then use a multi-meter or resistance/ohm meter on the 2 leads. If the resistance is zero, then slowly climbs to a higher resistance (reset to zero by touching the 2 leads with the screwdriver) then the capacitor is good. If the resistance is infinity or very large, then it's the internal switch.

If it's the capacitor, then replace it (those are easy), but if it's the internal switch then you have to take the motor apart. If you're mechanically inclined, I'd say take the motor apart and check the switch for corrosion and/or saw dust. Usually the lubricating grease dries out. Clean and re-lube. But if you're not mechanically inclined, buy a new motor.

Dec 12, 2010 | Bosch 4100 10" Worksite Table Saw

1 Answer

Electric blade brake sounds like it is seized up. Upon starting table saw (bosch 4000), motor sounds like it is binding. How can I disengage the brake??


There is no electric brake on the Bosch 4100 table saw. If the motor sounds like it is being held back its possible the rear armature bearing has seized or the field coil is faulty. Both these problems cause the motr to not turn at full speed. The motor must be serviced.

Dec 08, 2010 | Bosch 4100 10" Worksite Table Saw

1 Answer

I was cutting 2" dense foam insulation board,


The problem you have is a faulty field coil, the Bosch saws unfortunatly have a bit of an issue with this. The coil can be replaced separatly so you won't have to replace the whole motor. Bosch has a 1 yr warranty on thier table saw so this is a warranty replacment provided the saw was purchased within the year. If not the coil replacment is still cheaper than buying a whole new saw, but should really be done by a service center because of the level of difficulty of the repair.

Nov 10, 2010 | Bosch 4100 10" Worksite Table Saw

1 Answer

Saw slowed down. Shut off saw and restarted. runs backward.


Sonmethings shorted out inside motor / strip and see if any debris is in there.

It has somehow repolarised from the negative side to pos side!!

Jan 20, 2010 | Bosch 4100 10" Worksite Table Saw

2 Answers

Having trouble removing the motor from the bosch table saw. i have removed the four black screws from the black housing but it does not want to seperate from the aluminum housing. it will turn seperate...


tilt the saw head and then use a screwdriver to gently pry apart. the bearings in the housings are keeping it from coming apart or the armature and or field are melted causing this, either way the screwdriver trick will work.

Dec 07, 2009 | Bosch 4100 09 10" Worksite Table Saw...

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