My Bosch 1274DVS 3" x 21" belt sander will run only sporatically
When I pull the switch, the motor won't start. Sometimes, with the switch on and shaking it it will start to run. I replaced the brushes, but the old ones did't look too worn. Once it starts, it will run until I let of the switch, which seems to "click" and work OK. Sometimes, with rupeated triggering of the switch alone, it will start.
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I looked at the following URL to see if there was any safety device that might prevent it from working and I see none:
If there is nothing happening when you pull the trigger, the only thing you can do is trace the wiring from the power cord through the trigger and to the motor contacts, as shown in the aforementioned URL diagrams.
I assume the motor has not seized up on you since you did change the brushes.
Not to sound foolish, but did you try changing the outlet you plugged the saw into?
In some of the higher end equipment there is an inline fuse that is part of the AC plug assembly. Any chance that is part of the new cord? Blown or missing in-line fuses?
Please keep me informed of your progress as I find this quite interesting.
Remove the dust bag and unplug sander for now. Everywhere you see an access hole (fan area, dust port, back of sander blow thru the tool to remove lodged dust that clogged the system, Also look for broken belt pieces in the back of sander. Then while running (remove belt) blow again thru all the ports to try and reomve as much contamination as possible. When finished you can feel to see if air coming from dust bag port, it not you still have a clog that might need more work. If I have clarified your request would you please rate this response accordingly and thank you.
Try blowing through the little **** that collects sawdust (inside back by belt) with a compressed air nozzle, with the bag off, and squeeze the trigger and let the motor run a little. Blow out the insides as well as you can, including the air intakes for the cooling of the motor, and it should work fine again.
You can also blow out the bag to clean the pore in the fabric.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!
here is a parts breakdown. in center of picture is name of website where you can get a download. I cannot figure out if you are removing # 831 or 835 pulley. Either way its righty loosey on nut and you will have to hold opposite end to loosen.
If I am correct, when holding the tool in the normal operating position there should be an oblong cover on teh left hand side nea the back of the tool. It should be held on with a screw. remove this cover and you can access the belt . MAKE SURE THE TOOL IS UNPLUGGED. the belt should pull off/push on with a bit of force. Turning the pulleys as you put it on will help it go on evenly. If it is too stiff, put the belt in some boiling water for a minute or two to soften it up a bit.