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Thread: Stuck 9 grinder nut
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20th Jul 2021, 09:04 PM #1Intermediate Member
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- Jul 2021
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- Central NSW
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- 25
Stuck 9 grinder nut
My 9 inch grinder nut wont 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
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20th Jul 2021, 09:53 PM #2Most Valued Member
- Join Date
- Sep 2010
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- Lebrina
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- 1,915
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.
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20th Jul 2021, 10:20 PM #3Intermediate Member
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- Jul 2021
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- Central NSW
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- 25
Ok nothing to lose by welding on - good idea. Not sure if parts available for hitachi grinder - will see how we go
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20th Jul 2021, 10:44 PM #4Member
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- Sep 2010
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- Port Sorell, Tasmania
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- 74
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.
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21st Jul 2021, 08:40 AM #5Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
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- 1,898
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.
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21st Jul 2021, 10:37 AM #6Senior Member
- Join Date
- Jun 2005
- Location
- Townsville, Tropical Nth Qld.
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- 226
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.
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21st Jul 2021, 05:02 PM #7Golden Member
- Join Date
- Sep 2008
- Location
- Riddells Creek, Vic.
- Posts
- 838
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.
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21st Jul 2021, 07:30 PM #8Diamond Member
- Join Date
- Sep 2006
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- Mallacoota,VIC,Australia
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- 53
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- 1,010
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.
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21st Jul 2021, 11:38 PM #9Most Valued Member
- Join Date
- Apr 2012
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- Healesville
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- 2,129
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
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22nd Jul 2021, 02:53 PM #10
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22nd Jul 2021, 05:32 PM #11Most Valued Member
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- Apr 2012
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- Healesville
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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...
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22nd Jul 2021, 05:44 PM #12Golden Member
- Join Date
- Sep 2008
- Location
- Riddells Creek, Vic.
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- 838
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.
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22nd Jul 2021, 05:47 PM #13Golden Member
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- Sep 2008
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- Riddells Creek, Vic.
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- 838
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22nd Jul 2021, 07:47 PM #14Most Valued Member
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- Apr 2012
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- Healesville
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24th Jul 2021, 10:35 AM #15
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