Question about Bosch Electric Table Saws

1 Answer

My tablesaw wont speed up and run. Bosch 4000 ten inch. It makes a klunk and starts to turn and slowly speeds up until its running, but still makes a knocking sound

Ten inch saw, its frequently exposed to moisture on outside work...It fails to run smoothly, switch or capacitor or something damaged perhaps? can you tell me what would cause this. the bearings turn freely and its easily turned over by hand and spins but the motor is not working properly.

Thanks- love the saw, until now.

Posted by on

  • whatever and Nov 04, 2008

    Hey thanks! my text was deleted somehow, the motor turned but knocked and sped up but clearly something wrong..but spins freely. My local Bosch shop supplied me with a new motor controller which resolved the problem beautifully- it has the electronic soft start feature and EC control speed limiter which operates so much differently than the old motors. You can hear it hit the design RPM then level off rather than just reaching speed limited by the load.



    Probably moisture plus stress on the circuit board...first the saw did not work at all, then it worked fine again, then this weird knocking when I turned it on, running with very low power output.



    $32 bucks for a new controller which likely includes the capacitor, not too tough to install.

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 99 Answers

Is it spinning the blade at all? If it is then it is unlikely to be an electrical fault. Have you considered a motor bearing fault? If the motor bearings are worn, it could turn freely by hand, but when powered up it would stutter and stall. The motor is basically a big electro-magnet so if the armature has enough lateral movement, when it is magnetized it could rub against the stator.
If the machine is buzzing, but not spinning the blade it is more than likely going to be caused by a faulty capacitor as this is the component that gives the motor the initial 'kick' in the right direction to get it spinning.

Posted on Nov 04, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Saw starts runs good then when i start cutting it


Hi Jason:
Make and model might help but here's two ideas:
1) Remove muffler and clean it. They can get plugged up with carbon and the saw will run at low RPM but will quit because of excess back pressure when you try to rev it up.
2) Set the high and low speed carb settings. Start the saw then gradually increase engine speed until full throttle. Screw the hi-speed needle in slowly. If RPM immediately drops, back it out until Rpm increases, then starts to drop. Screw back in until peak rpm reached, then starts to drop. Back out to peak, then 1/3 turn more.
Set low speed so engine runs smoothly but chain does not turn.
Hope this helps.

Feb 01, 2016 | Garden

1 Answer

What is the setting for the hi speed and low speed on the carb


Hi Darrell:
Here's what I was taught.
- Wear hearing protection.
- Start saw.
- Adjust low speed screw... turn in slowly until engine falters, then back out a bit until engine sounds happy.
- Place screw driver in high speed screw, apply full throttle, adjust high speed..... turn in ... rpm shoud increase, ten drop off... back screw out until maximum rpm, then a tiny bit more to make sure the mixture is not too lean.
- Chain saw should now be happy.

Apr 28, 2015 | Garden

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

Poulan 45cc chainsaw will start running with starting with choke, but will not stay running.


Sounds like the low speed fuel adjustment is out of whack....you can reset it by turning it in all the way clockwise...then as a starting point, turn it out 1 and 1/2 times, start the engine and slowly adjust the screw until the engine starts to choke out..when this occurs, turn it back in until it starts to choke again...then you need to set it somewhere in between to find the "happy medium"....thew high speed screw is adjusted after you get the engine idling properly...if you haven't messed with this then I wouldn't worry about it..unless you have poor high speed operation, then you will need to set the high speed screw...the object here is to obtain the best low to high speed throttle...if , when you throttle up the saw, the engine bogs or goes to high speed slowly , here is where you adjust to get the best throttle response...use small increments until you achieve the desired response

Apr 26, 2011 | Poulan Garden

1 Answer

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?


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.

Aug 23, 2010 | 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

1986 Mustang 5.0 wont stay running very long with loss of power


it sounds like a stun gun?? you are losing spark, get it in a dark place or at night and look under the hood for the lost spark, spray water on the cap and wires, youll find it

May 18, 2010 | 1986 Ford Mustang

1 Answer

Bosch 4000 tablesaw won't start. Brushes replaced


I found that the remaining problem was a intermittent at the switch, which disassembly and cleaning resolved.
Tilting the motor / blade assembly down allows access from below, to the 3 screws fastening the controller circuit board cover on the brush end of the motor. From there, one can easily test exposed wires for power supply, see that brushes are contacting and clean accumulated sawdust.

Jan 06, 2010 | Bosch Electric Table Saws

2 Answers

Bosch 4000 tablesaw suddenly ran backwards and died


I had a customer bring me a saw with this same problem. All components tested OK on my growler. I went on a limb since the speed control and the armature tested OK. I replaced the feild since to me it seemed to be the only component that could cause the motor to run in reverse. Tool now works properly and have had no more problems with the tool.

Dec 02, 2008 | Bosch Electric Table Saws

Not finding what you are looking for?
Bosch Electric Table Saws Logo

661 people viewed this question

Ask a Question

Usually answered in minutes!

Top Bosch Saws Experts

River bottom

Level 2 Expert

174 Answers

Parson's Repair...
Parson's Repair...

Level 2 Expert

206 Answers

John Trevino

Level 3 Expert

1383 Answers

Are you a Bosch Saw Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...