G&G rk 104 stripping teeth on the sector gear

[driver5]

Very hard to see but that's the second sector gear this gun has stripped, it's missing 3 teeth that simply sheared off of the full ring (the gears that are driven, not the teeth that pull the piston). They're at about 5 o'clock in the picture.

Anyone know what causes this and how I can fix it? I'm going to get very frustrated if I have to change sector gears as often as I change mags.

[Cheeze_IZ_G00d]

I don't know precisely, but it could be a couple of things. Improper shim job, or perhaps a motor height problem. Is this just the stock G&G? If so, what type of piston is in there? Most probably it is a poor shim job.

[Doc Hollywood]

drop some systema gears in it and you wont have any probs...

[Vince]

drop some systema gears in it and you wont have any probs...

True to a point.

If it is shimmed looser than the average vag on Van Buren, it'll just transfer the stress to another system in the gearbox causing a piston to strip, fuse to blow, trigger switch to burn out, battery to fry, motor to get torn up worse than a fetus at Planned Parenthood, et cetera.

[XavierMace]

That was a classic Vince post there.  That said, I have heard lots of complaints about G&G internals.  They seem to be somewhat hit or miss.  I would replace the gears and re-shim it and see how it sounds then.

[Doc Hollywood]

yeah...  the dropping of gears in my book presumes the propper shimming is involved, but thats contingent on the dropper of the gear...

My G&G Socom was nicely tuned up and works great.

[driver5]

well, it stripped the stock gear after about 1000 rounds, i replaced it with a CA piece and 30 rounds later same issue. at this point I'm gonna take it to APD and say "hey strippy strippy no boobies make better" and cross my fingers. Anyone have a good reason *NOT* to bevel the tail end of the piston?

[Vince]

well, it stripped the stock gear after about 1000 rounds, i replaced it with a CA piece and 30 rounds later same issue. at this point I'm gonna take it to APD and say "hey strippy strippy no boobies make better" and cross my fingers. Anyone have a good reason *NOT* to bevel the tail end of the piston?

Because if it was a good idea, that's how they would come?

I don't have anything concrete to tell you except that, well, AEG pistons are pretty old tech, and the most people do in terms of modifying them is remove the second tooth to help the engagement with the gears, but that's for problems different than what you're having.

[driver5]

my thinking is that if the piston encounters any hang on its way back, that's going to cause a significant amount of stress throughout the gear system. If I bevel the tail end, there's a better chance of the piston sliding over whatever is going to catch instead of sticking and shearing teeth off a gear. AEG's have been pretty much the same since they were invented, and people often get into the "it works, why fix it" loop. If there's something that can be improved without sacrificing anything, it should be done. I don't have much experience with airsoft in specific, but I have extensive mechanical knowledge and I can't think of any issues that would arise from rounding the corners on the tail end. I'm not talking about serious removal of material, more like 1/32 of an inch radius type of work.

[JoJockAmo]

What type of spring?
Sure the other gears are ok? (teeth all cut evenly)
Im blank I'll post more tomarrow

[driver5]

First time around it was box stock (hadn't even cracked the gearbox)
I got bits and gomers to fix it, replaced the piston, cylinder, and piston head with aluminum systema parts, changed the sector gear to a CA standard ratio piece,and put an m120 in the box.

I cleaned and inspected the rest of the gears, and can't see any irregularities with them