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  1. #1
    Join Date
    Jul 2021
    Location
    Central NSW
    Posts
    13

    Default Stuck 9” grinder nut

    My 9 inch grinder nut won’t come off. Have had the thing in the post vice with stilson on it and I cannot shift it - now seemed to have rounded off the lock button mechanism inside the grinder head! Any assistance here or should I scrap it and buy a new one? - I guess I might trade down to a 7”

  2. #2
    Join Date
    Sep 2010
    Location
    Lebrina
    Posts
    1,630

    Default

    I feel your pain. Nothing jams a flange nut like a 9" and I'm guessing that it's most likely a cutting disc that's stuck.
    Option 1/ Vice grips on the blade or wheel (if there's enough left) and then swing off the nut with the pin wrench furnished with your grinder.
    Option 2/ Weld decent size hex nut onto the flange, two of the flats should be enough and then hit it with an air or electric rattle gun. This one has worked quite well in extreme cases, in fact we left the nut permanently welded on our cutting disc flange nut where I once worked.
    If the grinder is a decent quality, then get a new shaft lock mechanism and you should be sorted.
    A 7" will grind as well as a 9", but that extra reach offered by the 9" can be a life saver when cutting.

  3. #3
    Join Date
    Jul 2021
    Location
    Central NSW
    Posts
    13

    Default

    Ok nothing to lose by welding on - good idea. Not sure if parts available for hitachi grinder - will see how we go

  4. #4
    Join Date
    Sep 2010
    Location
    Port Sorell, Tasmania
    Posts
    62

    Default

    Have a 40ish yr old Hitachi with similar problem, caused initially by a jammed nut. Have used a hammer and cold chisel for years. I use my boot against the body of the grinder and wheel at the same time then hammer and chisel. I put a light smear of grease on the nut where it mates against the blade and this seems to make it less likely to bind.

  5. #5
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,637

    Default

    I haven't had this particular problem, but I wonder if a 1/2 inch square drive impact "rattle gun" could do it, with an adaptor if needed.
    I thought these were a brutal tool, mostly used by tyre fitters to make sure wheel nuts were over-tightened.
    But after hearing how useful they could be, I tried one and have changed my mind.
    Used carefully, not only is it effective but surprisingly undramatic, and usually I don't need to restrain from turning, the part a nut is screwed to.
    Mine's cordless, mains electric and air types are also available.

  6. #6
    Join Date
    Jun 2005
    Location
    Townsville, Tropical Nth Qld.
    Posts
    190

    Default

    I have a Makita, same issues, but the shaft has 2 flats on it, found the appropriate open end spanner for it, it was too short, so added a pipe extension and then hit the 2 pronged tool with a wood mallet, comes off easily. I also use a bit of Lithium grease on the threads.
    Rgds,
    Crocy.

  7. #7
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    656

    Default

    This tool makes short work of removing a jammed locknut, it has got me out of trouble many times and now I just use it rather than mucking around with the tool supplied with the grinder. I used to use it with a pneumatic impact gun but now just use the Milwaukee 18 volt impact wrench. The reason that it works so well is that you are pressing down on the nut reducing the chance of slipping out of the holes like the standard hand held wrench does, especially when the holes in the nut are worn.
    Attached Images Attached Images

  8. #8
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    50
    Posts
    904

    Default

    Those 9" can be a pain in the rear when they jam. We had a Hitachi 9" Angle grinder that would jam the flange nut on and damage the rear flange if the disc got jammed up. I either hit the pin wrench with a hammer or used a outboard powertrim tool like Techo1 has shown. Good luck.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  9. #9
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    1,770

    Default

    If you hammer around the face of the nut the hammering crushes the disc a bit and then the nut will undo........
    I thought everyone that worked on site knew this

  10. #10
    Join Date
    Aug 2009
    Location
    East Warburton, Vic
    Posts
    352

    Default

    Quote Originally Posted by Techo1 View Post
    This tool makes short work of removing a jammed locknut
    Where about did you get this from, trying to find one online but can only find the outboard trim type
    Cheers

    DJ

  11. #11
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    1,770

    Default

    I think peoples need to be aware that using a rattle gun on the grinder nut runs the risk of breaking a gear tooth,
    although they are hardened they aren't very chunky gears...

  12. #12
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    656

    Default

    Quote Originally Posted by Acco View Post
    Where about did you get this from, trying to find one online but can only find the outboard trim type
    I'm not sure where I got this from, probably somewhere like Total Tools etc. I do remember that when I saw it I thought that it was a good idea and worth giving a try as I was having a lot of trouble with cutting discs getting really tight on 9" inch grinders at work, and it did the job surprising well, saving a lot of time mucking around with other methods.
    I have not seen another one of these since I picked this one up over 20 years ago.

  13. #13
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    656

    Default

    Quote Originally Posted by shedhappens View Post
    I think peoples need to be aware that using a rattle gun on the grinder nut runs the risk of breaking a gear tooth,
    although they are hardened they aren't very chunky gears...
    Not really, the spindle locking pin takes all the load.

  14. #14
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    1,770

    Default

    Quote Originally Posted by Techo1 View Post
    Not really, the spindle locking pin takes all the load.
    G/day Techo, ah yes, the magic button, I had forgotten about that little gem, probably because they never had them in the past.

  15. #15
    Join Date
    Jun 2007
    Location
    Ipswich QLD
    Age
    65
    Posts
    1,931

    Default

    Bured threads are arpia on 9in

    Sent from my SM-T580 using Tapatalk

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