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Post by nubtarts on May 29, 2012 18:18:32 GMT -5
I have a G&G AK47 and a brand new King Arms P90 and they are having the exact same issue; the gun shoots fine for up to 200 rounds on full-auto and then the gearbox locks up. Shooting it quickly on semi-auto will cause it to lock up after only a few shots. The gearbox unlocks its self randomly (anywhere from 5 seconds to 5 days), only to get locked up again. Once it gets locked up, you can hear the motor attempt to move, but nothing happens. Also, the batteries and wires become scolding hot. Whatever the problem is, it definitely isn't a battery issue because I have used 4 different fully charged batteries with no luck.
Any advice on how I could possibly fix this issue would be greatly appreciated.
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wolf703
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Post by wolf703 on May 29, 2012 19:05:58 GMT -5
Check the motor it might be to engaged on the gears. This happened to Emily's Gun recently. Back the motor off the gears and see if that works
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Post by nubtarts on May 29, 2012 20:28:36 GMT -5
I just adjusted the motors, but still no luck
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wolf703
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Post by wolf703 on May 29, 2012 20:38:10 GMT -5
Hmm. Warm Battery. The next thing is probally the motor.... my ICS Galil did the same thing.... Sorry bout your luck if thats the case. Check it out if you are gun savy. If not head to a shop to get it fixed. Doc can still do repairs last I heard.
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Post by Nippz - Command on May 30, 2012 0:41:13 GMT -5
same problems with my DPMS M4. tore it all apart found gunks of crap like grass and other junk inside my gearbox and attempted to clean it from the outside, since I've never tore apart a gearbox i didn't want to try until the gun is completely thrashed then i wont care if i can put it back together. so i sprayed some rem-oil in there after cleaning out the crap, wiped it all out and let it dry then sprayed tiny bits of silicon in there ,very little bit, and now it doesn't lock up as often, it locks up after a hi-mag and that's it. don't ask me how grass and other crap got in there. i let my wife use it more than i have so no clue! haha
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Post by Ferratus-Command on May 31, 2012 13:22:21 GMT -5
same problems with my DPMS M4. tore it all apart found gunks of crap like grass and other junk inside my gearbox and attempted to clean it from the outside, since I've never tore apart a gearbox i didn't want to try until the gun is completely thrashed then i wont care if i can put it back together. so i sprayed some rem-oil in there after cleaning out the crap, wiped it all out and let it dry then sprayed tiny bits of silicon in there ,very little bit, and now it doesn't lock up as often, it locks up after a hi-mag and that's it. don't ask me how grass and other crap got in there. i let my wife use it more than i have so no clue! haha Sounds like it could be some shimming issues..
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Post by nubtarts on Jun 3, 2012 13:53:18 GMT -5
I reluctantly opened up my P90 and found a small broken piece of plastic jammed in my gearbox. I have no idea what it went to, but after putting everything back together it shoots just fine now. I think it probably needs re-shimmed though. Now I just need to figure out how to fix my AK..
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wolf703
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Post by wolf703 on Jun 3, 2012 20:41:37 GMT -5
Check your BB's... What brand are you using? Plastic bits normally mean shattered BB.
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Post by Gangnail-Command on Jun 4, 2012 2:46:05 GMT -5
or piston teeth
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Post by nubtarts on Jun 4, 2012 13:07:22 GMT -5
Well I checked the entire inside of the gearbox and it didn't seem to be any part of it, nor was anything broken. I think it was possibly a broken piece of the P90s inner furniture. Also, I'm using high grade ICS and EcoSphere BBs from AirsoftGI, so I don't think that is the problem.
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wolf703
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Post by wolf703 on Jun 4, 2012 21:53:59 GMT -5
High grade ICS and EcoSphere.... I kinda stopped trusting ICS. and two is Ecospere a biodegrable BB? Cause i it is anything shooting over 350 it seems shatters the hell out of them
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Post by nubtarts on Jun 9, 2012 22:21:33 GMT -5
Yeah they are bio BBs but I just tested them out with a hammer and they don't shatter
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Post by Nippz - Command on Jun 12, 2012 11:49:14 GMT -5
want to test sumthin small and plastic? beat it with a hammer! ok Thor you win this round. haha
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Post by Sliverpix on Jun 15, 2012 0:30:56 GMT -5
want to test sumthin small and plastic? beat it with a hammer! ok Thor you win this round. haha LOLOLOL "HULK STONGEST THERE IS!! GOLDIELOCKS!" But seriously, you are right on the money with inspecting the gearbox during lock up issues. In order of common to rare solutions... 1) Electrical issue -- low volt battery, damaged/poor wiring, damaged battery cell, poor or high resistance connection at battery, fuse or motor, etc... 2) Dirty Gearbox -- typical on ALL AEAGs (even gas) is the dirty gearbox. You will get piston debris (especially is its a plastic one), gear and tooth decay (no dont call your dentist), field debris (grass, weeds, dirt, mud, etc...), BB powder (this is not a damaged BB but the powder left over from the manufacturing process), human/animal hair (yes boys and girls its every where). No there is no fix for this. Your piston must draw in AIR to propel the BB and thus it pulls in debris too. Small holes in the gear box for air flow and wiring and internals is common and also allow debris INTO your weapon. 3) Dirty Motor -- Every electrical motor known to man has this problem and always will. The BRUSH is the contact that rides against the motor and carries the current to the magnets of the motor. They are typically made of carbon or combine with powdered nickle or other conductive metal. As Electricity moves across the brushes some of the brush material is broken loose (happens because electrons are moving)... this material builds up in the motor and can cause the bearings to jam up. What can u do? nothing. Replace the motor and same your mind and time. (if you REALLY wanted to, you could tear-down the motor but i would not recommend it unless you have VERY specific electrical/electronics training) 4) Misadjusted Motor -- This is a RARE one... but usually this happens after motor removal or replacement. First be sure you are using the RIGHT motor for the job (ie: has enough torque and the right teeth for the job). Simply back the adjustment screw (usually on the bottom of the weapon grip) out until the motor just starts to SQUEAL. Then slowly (about an 1/8th of turn at a time) turn the screw back in. You are looking for the quietest SQUEAL you can get. 5) Misudjusted Shiming -- This is a RARE one ... this is typical after tear down of the gearbox. You will need to refer to your manufacturing specs OR an online spec or guide to get the proper shimming. Shimming directions are outside the scope of this post, but basically you want to eliminate as much of the "slop" in the gearing as possible and still maintain good tooth-to-tooth alignment. Misaligned gears will SQUEAL and RATTLE and in the worst case... strip out entirely! Be sure you know what you are doing before you try to re-shim your box.
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