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  1. #1
    Join Date
    Jul 2020
    Location
    Romania
    Posts
    9

    Question circular saw revision

    Hello ! I have a old Makita 5604R circular saw and I disassembled it and I checked the components inside. Also, I found a lot of dust inside, and I made a general cleaning of the components.
    Before disassembling the tool, I started it by pressing the button, and it worked, but I wanted to make a revision.
    I would like to know:
    1. which of the components needs to be replaced when making a revision of the tool ?
    2. what kind of lubricant I need to use for this type of tool ?

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  3. #2
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    4,068

    Default

    The only component that would require lubrication would be bearings, but in you case I would think they are sealed so don't require lubrication, unless they are fault in which you would need to replace them.

  4. #3
    Join Date
    Feb 2007
    Location
    blue mountains
    Posts
    4,586

    Default

    I replaced the bearings in my very old makita saw some years ago and can confirm they are sealed so no lube required.
    Regards
    John

  5. #4
    Join Date
    Jul 2020
    Location
    Romania
    Posts
    9

    Default

    I was told to use general purpose lithium grease (high temperature and high speed grease) for the inside gears of the circular saw. I assembled the saw and I saw that after about 10-20 seconds of work with no load, only the blade, the area were the gears are located is a little bit warm. It is normal ?
    Also, I found that the carbon brushes makes sparks like in the image: carbon-brushes ImgBB . I cleaned the armature and the brushes using sand paper, before assembling back the saw. Is the dimension of the sparks also normal ?

  6. #5
    Join Date
    Jan 2006
    Location
    United States Of America
    Posts
    192

    Default

    It it was running cooler when new something may be wrong.
    When taking apart power tools I always check the carbon brushes and gently clean the commutator if necessary. Check the bearings by giving the threaded shaft a push and pull in and out. Special electrical cleaning spray is available. Make sure its for delicate or sensitive electronics.The manufacturer will tell you what grease to use.

  7. #6
    Join Date
    Nov 2008
    Location
    Sydney
    Posts
    117

    Default

    The gearbox will overheat if it is filled with grease, caused by the friction of the grease being churned. The amount of grease required is in the region of 1/4 to 1/3 full. This means the gears can pick-up lubricant as required but are not immersed in it.

    Chas.

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