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KWA 2GX Bearing exploded!


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#1 taaltrek

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Posted 30 March 2013 - 08:53 AM

The other day at a local op my KWA SR-10 went down (It's been fantastic from Day 1 and it's right around the 25,000 round mark so I was a little surprised. After dissambling the gearbox, I found that one of the bearings (for the spur gear) had exploded. Everything else in the gearbox seems to be fine (fortunately, the little ball bearings did not get into the gearbox to shred everyhting). I will probably replace the piston since there is some signifigant wear on the first few teeth. Has anyone else had this happen? I'm still convinced that the 2GX gearbox is one of the toughest and most overbuilt gearboxes on the market, but I'm wondering if this has happend to anyone else. Also, I'll try to post pics of the internals later.

#2 gcw360

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Posted 30 March 2013 - 12:24 PM

It has happened in the past. The best thing would be to order replacement bearings from the Pro-Shop.  I would replace all of them personally so that you have even wear and are insured against additional bearing failure in the event any of the others were damaged.

#3 taaltrek

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Posted 30 March 2013 - 12:44 PM

Yeah, that was my plan, I figure bearings are cheap, and taking apart a gearbox is a pain : )

#4 vanevery

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Posted 30 March 2013 - 02:10 PM

It is going to happen at some point.
All gearbox components fail at some point.

Your ball bearing bushing failed a little quickly.
I have not had problems in my KWA gearbioxes of pre-mature failure, but have blown thru I a couple resulting from stress tests and age/ number of rounds.

I find shimming helps prevent this.
I was even doing stress tests in my KWA DMR using Full-Auto with an SP150 Spring a couple weeks ago deliberatley trying to blow the bearings and couldn't do it. This was with a 11.1v / 2500mah / 25-35C. I am about to open my gearbox for maintenance and some changes that include dis-engaging the Full-Auto feature. Three Full Mag Dumps, no blown bearings.

#5 Oldarmy

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Posted 06 January 2014 - 10:31 PM

I own a BR and M4 CQB and although I agree that parts fail and that is to be expected but last Saturday both of my guns went down and it was caused by 1 bearing in each one, to me that is a bad product. I love my guns and I will be having a local tech repairing them but just seems odd to have the same thing happen on both guns.

But all I carry is KWA, so I just hope they take a look at these bearings being used, as this seems to be an issue.

#6 gcw360

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Posted 07 January 2014 - 02:56 PM

View PostOldarmy, on 06 January 2014 - 10:31 PM, said:

I own a BR and M4 CQB and although I agree that parts fail and that is to be expected but last Saturday both of my guns went down and it was caused by 1 bearing in each one, to me that is a bad product. I love my guns and I will be having a local tech repairing them but just seems odd to have the same thing happen on both guns.

But all I carry is KWA, so I just hope they take a look at these bearings being used, as this seems to be an issue.
Sorry you had issues.  How old are your guns and have they been modified from OEM?

#7 Chuck S

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Posted 08 January 2014 - 03:43 AM

If you're opening the gearbox to replace bad bearings I'd replace them all.  Likewise any worn parts including the gears.

But... Add up the prices for all new bearings, gears, cylinder, piston etc. and compare to the price of a complete, new custom gearbox from the KWA at $125.

-- Chuck




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