Question about Makita Saws

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I have a Makita circular saw that when you try to start it it barely turns and flips the breaker or tries to all the lights dim!! Is there a start compacitor for that saw

Posted by Brian Hutsin on

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1 Answer

Vernon Taylor

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  • Makita Master
  • 7,446 Answers

All portable power tools including saws and most tradesman type saw benches use the light and powerful series wound brush-type motor that doesn't use a start capacitor.

The single phase induction motor that does use a start capacitor is far too bulky and heavy for portable tools but is found in many of the static workshop tools.

The powerful brush type motor is electrically very noisy and is almost permanently at the edge of self destructing. Good suppression to prevent radio and tv interference is necessary and this also helps protect the motor but a mains transient or power surge while in use can cause an internal surge destroying the insulation of the windings rendering the motor useless in a millisecond.
This could be what happened to your saw though it could equally be an internal short circuit in the power cord or inside the saw and these things must be checked before either writing off the tool or sending it for repair.

Posted on Jan 12, 2021

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5 Related Answers

Anonymous

  • 1 Answer

SOURCE: makita table saw switch wiring

After much trial and error, a little smoke, and wrecking one replacement switch, I solved a similar problem with my Craftsman Cmpd Mitre saw. Different saw, but likely the same principles are involved.
If the switch is a double pole single throw switch, with one side normally open (N0) and the other normally closed (NC), and the saw has a separate wire for the brake, this will probably work.

One side of the switch should have contacts that are normally open (NO) and only connect when the switch is ON. The Hot (Black) wire from the plug connects to the wire on the machine side (red or maybe black) through this NO side. So, connect these two wires via this NO side and the saw will run when the switch is ON but will have no brake; so far so good.
There should be another wire (Not the neutral white) which is the brake wire. This gets connected to one of the connection sites of the Normally Closed (NC) side of the switch. From the other connection site of this NC side run a short "jumper" wire (of the same guage as the other wires) to the Machine Side of the NO side of the switch (same place as that Red or Black? wire above) .
What seems to happen is this:
There's no power to the machine or the brake when the switch is OFF. Turn it ON and power goes from Hot through the NO (now closed) side and the saw runs. The brake doesn't run when the saw runs because the NC switch is now open. Turn the switch OFF and the NC switch is in fact closed and power is transfered to the brake via the jumper wire from the still spinning armature which now acts as a generator (alternator?). Once the brake has done its job and the armature stops spinning there's no power anywhere until you turn the switch ON again.
Or at least that's the theory, and in my case it works; no more smoke.

Posted on Feb 04, 2009

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efs_perpends

efs_perpends

  • 1997 Answers

SOURCE: where is the lock button for the skill saw

I can't seem to access the parts view for your model, because of its age.
But I'm thinking skil probably hasn't changed things all that much.
Take a look at the 5450 and see if this doesn't help any...click here ...and scroll to page 7.

Posted on Apr 10, 2009

Anonymous

  • 29 Answers

SOURCE: dewalt ds2400 wet saw will through in line breaker not start

sounds like the breakers working to good,i would by pass the reset switch,most likely that switch is bad anyways,we always plug our saws into a outlet box that has a breaker in it ,you know those reset switches are stupid, by pass the reset switch like it wasnt even there,and if that works i would replace the whole cord with a new 1,and buy a 5 dollar junction box that has a breaker in it,i dont know if there is a seperate plug on that saw where u plug the water pump into, if there is i would check that plug first before you bypass the switch.good luck chad

Posted on May 31, 2009

rowdy45176

David Ford

  • 2176 Answers

SOURCE: Makita Circular saw 5007NB, the cutting depth

you can try spraying some lubricant on the bolt/roll pin and see if that frees it up that is about all i used to do to them

Posted on Jul 01, 2009

Frank Bushnell

  • 5 Answers

SOURCE: I have tried numerous times to undo a nut on my

I have B&D D984 circular saw attachment.
1) Unplug the tool before doing anything ! ! !
2) Lock the blade with a rod or screwdriver through the hole in the guard.
3) Turn the bolt head anti-clockwise (it's a normal right-hand thread).

Reassembly:
4) Make sure it's unplugged !
5) Oil between the rotating washers on the black moving guard.
6) Place blade (with teeth pointing anti-clockwise) on the black moving guard and insert guard into unit with blade uppermost.
7) Insert bolt most of the way, not tight.
Ensure guard rotates upward and is stopped on the way down by the stop screw.
8) Tighten bolt, locking the blade as before.

Posted on Jul 09, 2015

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