Question about Makita 12? Metal Cutting Saw # LC1230

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Appears to be commutator segment burnt out. Wont start at times, but spin the wheel and it takes off. Is this a sign of more problems to come?

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The brush's on the motor are dirty are it needs new ones

Posted on Feb 19, 2011


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How do you tell if the starter has gone out

starter failure is indicated by several actions
1--- very slow in turning the engine ( something like a flat battery)---bushes shot and armature poling on shoes-- repairable
2--- clicking solenoid on starter but not spinning motor--- faulty solenoid contact points not completing power circuit--- solenoid replacement
3--starter spins fine on one start but will do nothing on restart or will restart if the engine is turned a fraction by hand-- dry joints in commutator bar in armature starter stops spinning on start and the faulty bar is under a brush thereby not making a circuit on restart--- repairable
4--starter shows signs of burning/ heat on the outside -- starter held in engagement with the fly wheel and burnt out the wiring
5--- starter spins and engages the ring gear but doesn't move the crank--- over run clutch on pinion of starter is failed --- replaceable
if the starter is what is known as a stepped starter ( body of the starter is not in direct line with the pinion nut works through an idler gear) there could be failures in the drive of that idler gear
fortunately most starters will last the life of the motor if used correctly ( not winding over until the battery is flat)
if the engine is held in good tune then a starter will operate for as little as 15 seconds to start an engine and most starter problems faults can be traced to
failed cells in battery --- have a load test done
dirty battery posts and terminals-- should be shiny clean and tight
bad ground wire point on engine for battery lead
faulty starter relays
problem ignition switches

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.

Wma62 wont spin

Check out the carbon brushes in the motor. Theyre graphite blocks which transfer mains power to the copper segments of the motor - located at the other end of the motor from the drive pulley. Theyre probably worn down. They're quite cheap parts and easy to replace - the holders are plastic or bakelite and are generally held in with screws or plastic clips. Also, look at the copper segments they run on to check for burning or pitting. If the segments are burnt or damaged you need a replacement motor or a replacement armature (motor part) if you can source one. Occasionally may be a fault in the motor drive circuit board - in which case replacement of board only real option. Other possible causes of spin problems: Faulty pressure switch - machine "thinks" the drum is still full of water so wont enter the spin cycle. Spin problems may also be caused if the machine reckons the load is out of balance, rearrange the load. If problem persists could possibly be a fault in the out of balance detector switch or the suspension and damping system.

Blue sparks coming from drill

you have an electrical problem, I would look at the brushes and see if they are burnt and while out look at the commutator for unusual colors on the various segments or raised bars, if they are you would need to replace the armature and brushes.
Feb 02, 2012 • Drills

Unit has hard time starting, need to turn wheel, only runs at slow speed

you have a problem with the bearings or the motor/brushes are burnt. Does this tool arc when running. If so I would check the brushes first, unplug the tool and remove them and while they are out rotate the motor slowly and look at the commutator bars for excessive discoloration or unusual wear.

Should a commutator fall of my motor after 14 mths of use if my 36volt drill is built tough.

It is possible, but normally something else should fail first if the problem was due to heavy loading. If a segment has come out of the commutator, it sounds more like a manufacturing fault, if a wire or the segment is burnt then if could be from running at low speeds and high chuck loading.

Bike wont start. battery charge up ,push starter button all i hear is a clicking sound.

Hi and welcome to the site,

Initially, have the battery load tested.

Offhand, temporarily jumper the 2 big terminals of the starter relay. If the starter motor spins, then a faulty starter relay. To locate the starter relay, follow the cable from the battery's + terminal.

If even jumping the 2 terminals, the starter motor would not turn, either:
  • starter motor has issues more particularly the carbon brushes and/or the commutator segments; or
  • the battery is no longer able to hold sufficient charge.

Good luck and thank you for asking.

My car wont start unless i bang on the fuel pump why?

Either there is a blockage or it is faulty.I would suggest a replacement and using a fuel filter before the petrol flow to the pump.This would stop debri or dirt from going into the system.Hope this helps.

Hotpoint - wont go into spin!

two possible causes motor commutator is damaged thats the bit the brushes sit on.put your finger on the commutator turn slowly and feel for raised segments or damage if there are any then this is you problem. if that is ok check you brushes have a good length and can make contact. if this is ok then check you card for damage.the filling/water level problem could be due to the limit switch pipework blockage at the base thats the small plastic pipe usual blocked into drum very common in old machines. hope this helps
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