Question about Makita 9005B 5" Electric Angle Grinder

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Can't get grinder to turn on. Checked brushes, cord, trigger/switch. Any suggestions?

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  • taryna Feb 26, 2009

    Yes I had, I talked to Makita themselves and they said it is probably the armature which can burn out if they used too high of voltage in the cord.

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  • Master
  • 2,176 Answers

Did you check continuity to the field/brush holders. They have a garter spring that sometimes became overheated and broke. It seems like you have done everything else. Let me know

Posted on Feb 25, 2009

  • David Ford
    David Ford Feb 26, 2009

    I would still look at the continuity to the brush holders. That armature is pretty durable.

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1 Answer

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Could be a number of possibilities from the power cord, the switch, any possible safety devices, radio suppressor, any electronics through to the motor brushes.

A 4 inch grinder doesn't take long to take apart and this would probably be the best thing to do initially to ensure there are no obvious problems like worn or sticking brushes or poor electrical connections.

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First thing to check is the brushes. They should be long enough and the springs should be strong enough to push the brushes firmly down on the armature. If not replace them. Next, check outlet with another tool; if no power fix outlet issue or use another outlet. If you have power at the outlet, plug in grinder and check voltage where cord goes in the grinder switch. If no power, replace the cord. If you have power coming in, check for power on out side of the switch with the switch on. If you don't have power replace the switch. If you have power out of the switch and the brushes are OK, you may have continuity problems in the field or armature. If you have the equipment to check them do so and replace what's damaged. If not I'd just replace the grinder, if you need an armature and/or field you would be better off with a new grinder.

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1 Answer

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Most common problems with small grinders in general (all brands) fall into two main catagories. Low power situation and lack of lubrication /debris or maintainance. Electric power tools are used with an extension cord. If too long of cord or improper gauge wire is used, the tool will heat up and burn the brushes, switch or copper winding (lower life of tool). If you feel the tool getting hot either let it cool or check power supply. Tools such as grinders generate lots of dust/debris that enters the tool. Abrasive dust entering tool prevents proper cooling and eats varnish off winding / wears carbon brushs and commutator. Grinders/polishers get packed inside with fluff coming off bonnets preventing cooling. All this overheating prevents grease from properly lubricating gears. Check gearcase for good lubrication and keep inside of the grinder clean. Good luck

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I could be a bad plug or a frade power cord. Whith the grinder unplugged make sure the grinding wheel turns by hand. If it does it could be a bad on off switch or the brushes in the motor could be worn.

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1 Answer

The grinder just stopped working


They are very simple inside, the only serviceable parts: if its not a switch/connection it is the motor brushes. Or the motor is defective.

It would only be the motor brushes if you had been using it for a longtime before and they wore down.

If it is new, return it for warranty exchange.

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1 Answer

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you need new brushes. carbon is meant to be touching the armature not the contact from the spring. Its worn down

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Yes, if you have taken the handle halves apart (unplug tool first) check with your meter thru the blades on the cord to the switch contacts and then lock the switch in the on position and check across the switch and then remove the brush caps and brushes and check thru to the brush holders, if at any time you lose continuity then that would be your problem. Let me know if I can help further.

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1 Answer

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Hi

Check the power suply cord, the switch ONN/OFF ;the brushes and the electric engine(field and armature).

best regards savumihai71

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