Makita GA 5030 Angle Grinder: Struggling to Unscrew Disc Nut & Broken Spindle Lock Button

Hello! I have a makita GA 5030 angle grinder, it works great, but there was a problem with changing the disc. pressing the spindle lock button and trying to unscrew the disc nut I can't do it for any treasures. Not only that, I broke the spindle lock button. I locked the spindle with a wrench and it broke! How to unscrew this nut to change discs? What did I do wrong that this happened?? maybe it's best to go to the site only if it's worth it.

I would turn it counterclockwise.
There is nothing left now but to open the gearbox and remove the broken key from it.
You might even have to break the shield to do it. 2 pipe clamps should help unscrew.

The nut should be tapped hard, definitely once, twice .... then after locking, unscrew ... remembering the direction (look at the twist of the thread on the screw)

I unscrewed the broken pin lock and got rid of it from the inside. I replaced the spindle lock with the "Romet" bicycle wrench and turned it counterclockwise with the grinder wrench, but it didn't budge and the "Romet" wrench itself broke! maybe spray it with wd40, wait a few days and unscrew it?

Waste of your time and nerves. use another grinder to cut the mounting plate at the thread itself so as not to damage the thread. The rest is easy to unscrew. Unfortunately, a throwable shield.

I do it this way. I clamp the grinder in a vice by the friction disc, then I hit the fastening nut with a hammer through the pin. Goes first/second time. But the shield is throwable. You can also insert a flat spanner, probably 22 or 24 between the shield and the head and use it as a counter.

I have the same problem with my grinder, one time in a row.
Is there any way to keep it from getting so tight?
I do not tighten on the "stick shield" when it pulls it will stop, but I can never unscrew it.
Maybe I would have to use something somewhere, e.g. a copper washer? Will anything help?

Using grinders from Bosch, Makita, Metabo and other brands (even no-names) I never had problems with unscrewing the disc. Without any wrenches or hammers, just by hand.
But I also saw many "magic" hammer and chisel in the opposite direction to the direction of unscrewing ... :D

Or maybe the difficulty with unscrewing the shield is a signal not to "slaughter" the machine, not to squeeze the last forces out of it, not to tick the shields, not to overload until the smoke goes away...
So what if you have more strength in your hands than this angle, if you drive it ...? Are you "big" because you're stronger than a grinder? Prove your strength in the gym.

If properly used, the equipment will last for many years...
But the condition - skillfully ...

Recently, while cutting an angle iron, the disc on my angle grinder clamped and chipped. When trying to replace it, it turned out that it was impossible to unscrew the disk that holds the disc. After one of the attempts, the key bent, the attempt to unscrew it with a hydraulic wrench did not help, similarly turning the disk in a vice (after breaking what was left of the disk) and turning with an angle saw did not help either, of course, using a cutter inserted into the hole in the disk and pounding with a hammer. I tried all these methods also after flooding the thread and the disc contact with oil. Nothing helped. I found a video on the net in which someone using a second grinder cuts out the remains of the disc under the nut, and then unscrews it without any problems. Of course, the nut is suitable for knocking out. Due to the lack of a second grinder, I slightly modified the idea. I screwed the bow of the metal saw into the vice with the blade up, turned on the grinder and with the removed cover and the remnants of the disc under the nut, I ground the blade until it was completely worn out. When only the metal ring was left of the dial, the nut was unscrewed with the fingers. You must wear safety glasses or a mask.

I had a problem with the Makita GA9020 once when I used it with a diamond blade for stone and cut paving stones. You should absolutely not hit with a hammer and punch or chisel We clamp the grinder in a vice. We heat up
the nut with a burner, e.g. LPG - not too much. We unscrew normally with a key intended for this purpose. Always lightly lubricate the threads of the blade mounting bolt each time you change a worn blade. - there will be no problems with unscrewing later.

... and see what is the reason for tightening the nut on the disc - perhaps there is a burr on the nut on the surface pressed to the disc.
- the nut is replaceable and the method given by Andy 1978 is the best, and if it doesn't help, disassembly of the gear, which you have to dismantle anyway to pull out the damaged lock pin - maybe you broke the lock's seat in the gear body!!!!! Leftover crumbs can damage your gears!!!! This is your most serious problem, because unscrewing the dial is an ass!!!!
Sławek

This happened to me with low-quality discs.. Secondly, we mount the disc with the inscriptions up, then the nut does not cut into the aluminum ring of the disc, which is only on one side.. 😀

Hello. Colleagues, Screw the nut, i.e. the shield, with the aluminum washer on the shield upwards, i.e. to the nut. Then it won't be so tight.P.

Wodnik-W8 wrote:

Hello. Colleagues, Screw the nut, i.e. the shield, with the aluminum washer on the shield upwards, i.e. to the nut. Then it won't be so tight.P.

After what happened to me, I believe that the reason for tightening the nut on the blade may be a sudden entrapment of the blade during cutting, e.g. as a result of clamping by a cut piece of material that was not properly supported before starting work.
I use good quality Saint-Gobain targets. All have a pressed-in steel ring.

jaktom3 wrote:

I screwed the bow of the metal saw into the vice with the blade up, turned on the grinder and with the removed cover and the remnants of the disc under the nut, I ground the blade until it was completely worn out. When only the metal ring was left of the dial, the nut was unscrewed with the fingers. You must wear safety glasses or a mask.

My shield tightened and broke, after which the first time I had so much that I could not unscrew the nut. I did the method with grinding the saw blade, only I did it with the cover on. It worked I'm wondering if I should invest in a self-locking nut.
There is also a video on YouTube "Secrets of the angle grinder. How to unscrew the nut and replace the disc"

You can use paper washers under the shield and then there will be no problem with unscrewing - it is also important to put on the shield, which colleagues have already written about.