How-To: Makita 9227C Grinding Noise Repair
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- čas přidán 27. 09. 2015
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Makita 9227C new price from Amazon:
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Cord plug
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Gear lube
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Grease
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In this video, I show what was making the awful grinding noise. Also, I add grease and gear lube thinned out for better lubrication and heat dissipation. - Jak na to + styl
![Grinder Repair - Replacing the [Lock Button] Shoulder Pin (Makita Part # 256486-8)](http://i.ytimg.com/vi/fiX3kn00EpI/mqdefault.jpg)
You can use the oils used in high-speed scythe machines used for mowing grass. They are sold to farmers and villagers in small tubes, and these oils are of high quality and inexpensive.
Oils used in the axle shafts of front wheel drive cars can also be used. It is very sticky.
Bearing oils containing lithium can be used.
I'm a machinist. I've used them all my life. Boshc Gws series is very common in my country, spare parts are easily available. We use all of the big and small angle grinders. I've never had a gearbox problem so far. I've never had a machine that was scrapped because of its gears. Yes, you are right, when we disassemble the machine for electrical failure and look inside, we see that they are always without oil. But they still don't cause any problems. Bosch machines break down on average in their third year of heavy use. We replace armature, bearings and conductive charcoal brushes. 3 years more intensively, we use it every day. And then we throw that machine away. Because spare parts are not cheap either. It would make sense to buy a new machine. A hobby person who rarely uses the machine that we use for 3+3 years will use it for 15+15 years. The only important thing in these machines is whether you can get spare parts at the end of the first term. At the end of the second term, the machine is already thrown away. The machines stay oil-free, but strangely, we almost never have a gear problem. I understood the reason for this strangeness while reading the comments above. Yes, the oil evaporates and reaches the necessary places a little bit. I think this thesis explains the situation. The three oil types I mentioned at the beginning are suitable for this. I think Bosch brand expensive oil also has this feature. I guess that's why we don't have any problems with gearboxes.
I learned a lot from the video and comments. Thanks everyone. Cem...
Thanks for the hints, I managed a replacement easily after watching this! Good on you, saved me $
Do you have a video of the cord to your mikita buffer being replaced
What did u use to start pushing on the pin to get the gear out?
I just adopted 2 of these that have a similar noise though not as bad. Adopted means intercepted them on the way to the dumpster at a boat yard. Lots of polishing goes on here and I guess you just go buy a new one.
Your video is gonna help me give these guys a second life !
Is there any other way to separate those parts? W
Ie without a hydraulic press … like maybe a claw style puller ?
Great vid thanks 😃👍🏻 I'm having trouble with the switch on my Makita which led me to You Tube and luckily I've found your video. Other than the switch being broken it runs pretty sweet but I think I'll do a re grease as you've shown here as I suspect the bevel on your machine could have lived a little longer had it been serviced by its previous owner, thanks again !
+Chris whitlow Thanks Chris. Make the grease/lube a little thicker than mine. It started to seep a bit once the weather warmed up. The gearbox should be 2/3 full.
@MatthewMCRepair: Have you noticed an effect through the ground-terminal? Is the antistatic effect noticeable? Thank you and best regards!
I don't know. Haven't tested with and without.
Excellent work! very informative! thanks!
Your welcome!
Please the link to buy the spare part. thank you
Hi Mathew , good video info , I am about to service my AC drill gear , Can I use pure grease or have to mix with gear oil as per your video . your kind advice please . thx
If there is no way for it to leak out, go ahead and thin it out a bit with gear oil.
thanks for the swift reply will do as per your advice .thx pal
good one. i never knew about this gear oil stuff so far. always had just kind of cleaned the old grease and filled with new.
+matthewmcrepair when u say use gear oil to mix with the grease what type of gear oil/grese do u mean exactly?,could i use atf as an alternative?
ATF is too thin. I used wheel bearing grease and 80w-90 gear oil. Mix to honey consistency.
+MatthewMCRepair thx :)
neil froggy crompton
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Im try it to push the spindle og my 9565cr fore replement the gear bearing , out the way you show here in a 6 ton hydraulik pussher but nothing happend , in understand not not way ,
that's a polishing machine...that spins from 600 to 2800 rpm. if you have a normal grinder....that spins 7000, or 11000 rpm...those gears will be always dry no matter how thin or thick you make the grease, cause of the centrifugal force....not to mention the small gear on the armature that spins 30 000 rpm. lubrication inside the housing does not work like you imagined.. when spinning and heated up....the small particles inside the special grease evaporate...and the vapor lubricates the gears. when too thin...there''s a chance the grease can penetrate inside the motor housing and make a mess if the top armature bearing seal brakes. or just leak on the head seal... and 9227CB doesn't even have a seal. i repaired hundreds of 9227's and 9237's..
Thanks for the info.
Where can you get that special vaporizing grease?
@@ajg942 Youre local cannabis dispensary. lol jk
Hey man, what do you think about moly grease for the gear housing? I just bought some moly EP grease and going to give it a shot.
Petriunic1 what grease do you use?
Can you use motor oil instead?
very nice
Hello again Matthew. I haven been studying greases and what you did in this video is absolutely right. Greases for high speed enclosed gears in poorly sealed cases must have a consistency NLGI 00 which is almost like "apple sauce" but also the most important is the consistency of the oil used. the greases NLGI 00 for this kind of application must have a base oil viscosity of around 180 cSt which is almost the same like gear oil SAE 90. all this information is from Mobil and Shell. What about the mix you did on this video? is it still working good? any issue with the kind of consistency?. Thanks in advance.
Yes, no issues with mine.
@@HTMR Thank you for the reply. Gracias amigo.
I just bought the newer version of this polisher a little over a year ago. I noticed that it had that "gear noise" from day one but chalked it up to it being new and not broken in. So now a couple months after the warranty is up the noise is getting worse. my bearing like yours is a little rough but the ring gear has zero wear. There is also a fair amount of play in the spindle. Going to first try and press the ring gear a little more on the shaft, and if that won't work I'll press it apart and replace the bearing. Just pisses me off because this polisher really doesn't get used very often besides spinning the water out of my DA polishing pads.
That sucks. Let me know if taking some backlash out helps with the noise. Make sure to support the housing correctly.
Actually, after looking over the pinion gear and not seeing any wear or damage, I just re greased it and put it back together. I've heard other people on the web complaining of the gear noise also, so must just be a noisy gear train.
Mine has no noise after the repair.
hey what about mixing grease with any metal treatment like motorkote or superkote? i have tried those products with engines and they indeed help them to cool down and make them less noisy, those products are for industrial usage as well as bearings or anything that needs lubrication, the good thing iis over time they bond to the metal and get them so slick with no side effects, also they mix perfectly with any kind of oil, engine oil, transmission oil, etc you name it, those are products have been on the market for nearly 20 years with no complaints, so they are reliable, i think i will give it a try
greetings from Colombia
You can certainty try it. I just wanted to thin it out since grease alone does not seem to lubricate it enough.
ok, i will try it these days, yes the original grease of my grinder is more liquid, so i will give it a try..
@@vaguincolombia so did you try it please?
Too much grease will increase heat. Because thick oil have high resistance. High resistance make heat.
Gearbox need splash lubrication. Thick Grease will wipe out after gear rotate.
I have solution for this situation. I use chainlube non wax dry lube mixed with lithium grease. Almost look like liquid but still save for leaked.
I dont care about protection.i need performance. Low viscosity will reduce heat and increase rpm. I also give bearing this mixed lube.
Does it reverse?
عندى نفس هذه ولكن سرعته ضعيفه للغايه ماذا افعل وشكرا
Good 👍
That's a good idea with the grease but did it leak?
No.
@@HTMR good
Great!
Thanks
Interesting idea about mixing grease and oil. I was thinking about that my self. Not enough grease on gears of angle grinders is huge problem and I don't know why nobody out of so many manufactures from 54. (first Flex) until now did not solve it. I opened about 30 grinders in my life and none of them never had any grease on gears. In fact I put good amount of grease on them, turn on for 2 sec and when I open everything is almost dry. Honey consistency is good reference, but I think one should not put something which is too liquid. You want just right viscosity which will allow small amount of grease to get on gears during work at some average working temperature.
try corn head grease from john deere, just for gearboxes.
@@edwardyeo8031 WTF is corn head grease? I'm living in Serbia. :)
@@dusanboss7749 Google for head grease and see. Can buy it from John Deere dealerships
@@dusanboss7749 czcams.com/video/7zNhli-J0Gk/video.html
New update amigo. I have a dewalt DWE402 which is a 11 amps grinder. when i bought it new it was running constantly very hot on the gear case. Today i took an amps measurement with no load and the grinder was drawing between 4 and 3.85 amps later i changed the grease (which by the way that grease was so damn stinky) and i made the new grease just like you and guess what? the temperature dropped so much and i took the amps measurement again with no load and it was at 3.65 amps, the amps drawing dropped too!. So it was worth it to change that grease.
Dude! I just bought the same grinder and it burnt my hand on the broomstick from heat off the gearbox! I am going to have to re-Grease it.. because it gets way to hot!
@@pappaclutch3266 Yes do it, mine did that too when it was brand new. When you open that gearcase that original grease smells so bad!. it is better to change it.
Alejo Colombia Hey so I repacked it with new 00 Lituim red high heat grease.. I took a temp measurement and it read 140F on top of gearbox after 3mins no load. To hot to touch with bare hand.
Should I just consider this normal?
@@pappaclutch3266 Be careful with the amount of grease your putting inside the gear case. it is not about re-packing totally the gear case. it is the same like filling oil in an engine. it takes a certain amount, neither so little nor too much. just half space available inside the gear case should be enough to fill it with grease. let me know the temperature of that new result.
Alejo Colombia Thanks for the quick reply, when I Re-greased it I already had that in mind so I filled it half way and put some on the ring gear threads. I ran for 3mins no load and got 140F.
I read something on a forum and might try it. Mixing the grease with some oil to get a honey consistency.
I also seen on the forum that describe dewalt grinders get pretty hot.. I’ll just have to use gloves as it can’t be touched with out them. It would be interesting if you could take a temp test 3min no load?
Ugg looks like the bevel gear is not available anymore !!!
Won’t a thinner grease make it easier for the force of inertia to push the grease to the outer edges and little to no lube on the gears? I think it’s better to just use plain ol grease. The lithium kind I think. Just my two cents. Cheers
Bearing grease thinned with gear oil. Both can withstand much higher pressures than this application.
👍
I just put 3/4 grease to inside.sound very smooth because all teeth touching grease when spinning. I open gearbox and gear looks wet.
But for consequence gearbox will heat faster because grease have thermal conductivity more than metal and RPM will decreased.
I dont care about that,i just want silent sound.
I hit the lock when it was still turning slowly. Clunk! Frigged it up just like that! Part # anyone?
What's the model number for the bevel gear?
Part number 227512-0 for model 9237c
Макита «рулит»!!! И в 2021г
your armature gear has play in contact with the spindle gear. and that's because you pressed it too hard when replacing the spindle gear. i'm talking about maybe 1/10 of a mm. and for lubricating....noo need to make that mixture. lubrication inside works no matter if it's not on the gears themselves. it's special grease that works by vapors inside. you ALWAYS need to replace two joining gears...in this case it means replacing the armature.. a bit expensive repair...but when done properly it will works silent....like normal. i'm a certified makita specialist btw.
The armature was about $90, so if that was needed I would have just bought a new unit.
Where do you work? I work near the Mt. Prospect IL Makita facility.
i'm from europe, croatia. i have my own service/repair shop - MPU servis. i repair all professional tools, not just makita.
Gotcha. Ever thought of doing repair videos? I'm sure that would help a lot of people.
sure, i made a few and put them on my facebook business page. but not on youtube yet. don't have the time for filming and editing. maybe i'll do something soon.
Where can you get that special vaporizing grease? Thx
Does it not occur to you to make a proper job of it by also replacing the motor bearings?If the drive bearing is worn out, you can bet the rotor needs new ones too. They’re inexpensive and not difficult to pull and press. Check the brushes as well and clean the commutator.
It did occur to me, all bearings ended up being fine. I "thought" it was bearing noise, however it ended up being gear noise.
Sar
Would have been nice if you showed the actual repair taking off the gear and replacing it
I'm am truly sorry.
That's the only reason I watched the video, and not happening.
Thinning the grease will create another issue since the pinion gear is not liquid proof and the oil will seep back into your armature--not good!!
I believe the armature bearing is sealed, so nothing will seep past.
Don't confuse a 'shielded' bearing and a sealed one. It would be spectacularly expensive and difficult to do in bearings of this size. The grease/oil will lose viscosity as it heats up as well. The bearings in these style grinders are not sealed. Storing them hanging of course would drain back into the armature attracting dirt and increasing wear, etc. Don't believe me? Pack your gear case completely full then screw up the gear shaft. You will see grease push right through the bearing on the shaft. In car axles which are oil lubricated you will find a seal system with the bearings inside. A seal need a means of compressing on the shaft to work (thus the spring and lip on some) or a way to expand in a forceful enough way to complete the oil proof fit. A difficult engineering task at the cost point and size of these bearings. A packing gland would be needed again bumping up the size. Grind some steel for a half an hour and when it is warmed up take it apart (including the motor) and take a look. You won't do it again I will bet. Take care. Doug
So what do you recommend for lubrication?
Any top grade gear (not bearing although it is a fall back) grease is about as good as you are going to do. The ultimate is the Molydisulfide but at 3-4 hundred bucks for a tube it isn't practical. A cheaper alternative is Yamalube grease. The gear grease has 'sticking' properties that help. There are some teflon greases which aren't quite as expensive. The particles are designed to imbed in the metal. Bottom line: pop it open every five or ten hours of use and redistribute replace the grease. If you want to it is certainly possible to drill a hole the size of a spray wand in the housing and use a spray grease (I would try the white lithium perhaps) then plug the hole with fitted plug of your choice. I would tap and thread it while it is apart. Now you could give it a shot before each use. Take care. Doug
Actually his method of mixing worked for me, i took a multipurpose grease nlgi 2 and gear oil, the point is not to make the grease so liquid, it should be as soft almost as petroleum jelly, also the key is not to pack up the gear case with grease just a bit and there you go, with not problems at all
You fram
You sound like Michael Douglas
Is that good or bad? Your are not the first person to say that...LOL.
MatthewMCRepair a good thing pal!!!
Oh ok...LOL.
ground prong is for getting rid of buffing static...really? if you actually think that maybe dont do your own wiring
OK, maybe you should tell makita you thoughts:
www.makitatools.com/automotive/ToolDetails.aspx?Name=9237CX2
I'll just save you some time and quote it right from their site:
"3-prong plug to prevent static electricity accumulation"
Andrew Browner yu8nķm
Americans tend to talk too much & waffle.
Whatever dude.