anti reversal latch prob / downgrading.

[oggiegb]

Hello,

 

New to airsoft & would appreciate some help with a technical issue, I've a JG / ASG G36c AEG. It was firing at too high fps so I've took the gearbox apart to downgrade the spring.

Made a newb mistake and wasn't too careful with the spring so I had gears / shims flying everywhere but have put it all back together. Also put a new selector switch and upgraded spring guide.

 

I've two questions as below:-

 

1) The original spring has a hook on the end which hooks into a metal plug within the piston securing the front of the spring to the piston head. The piston head screws into metal piece, I've been unable to find any replacement springs with a hook like this. So is it acceptable to put a normal lower powered spring with flat ends in place and just screw the metal into place? In this case the spring won't be physically attached to the piston head.

If using a normal spring with the metal plug would this make a spring more powerful than rated as the metal plug would take extra space therefore additional compression? Reason for asking is I put a M90 in place but it seems more compressed/stronger than the original.

 

2) When I put the gearbox / trigger back together and wire it up, the anti reversal latch jams after pulling the trigger. I can release this by disconnecting the motor and pulling the latch with a screwdriver through the motor hole but it consistently reoccurs on every trigger pull. I initially thought this may be related to the new spring but I replaced the original back and still same issue. I'm thinking this might be caused by shimming issues (as due to the explosion when first opening the gearbox they shot out and I didn't see where they were located), is this along the right lines?

 

3) Phew, finally, as a last resort is there anyone in the Berks / Middx/ Surrey area who can repair / downgrade gearboxes just in case I have to give in and can't fix this before next skirmish ;-)

 

Cheers

 

Oggie

[RR01]

1) Piston heads with the spring fixed in place are usually Tokyo Marui and can sometimes be a pig to undo anyway. Suggest you get an aftermarket piston head with a standard fixing (not the TM block) as they work fine with standard flat ended springs. And yes, if you use a standard spring up against the TM head block you will increase the spring tension and probably the FPS will increase as well.

 

2) Did you put the anti-reversal spring back on the latch? It's only a very small one and easy to miss. Alternatively, you've probably reversed the wires to the motor, so it's trying to run in reverse and therefore jamming the gearbox as soon as you pull the trigger. Try reversing the motor wires first and see if that works. The red wire should go to the side with the little + mark near the terminal. If it does, remember how it fits next time.

 

3) No idea. I work on them all the time (mainly V2, V3 & L85) but I'm nowhere near you.

[oggiegb]

Thanks for confirming about the spring, that's really useful. Will look to getting a new piston head once I've the original spring working again.

 

I did have the anti-reversal spring in place, can definitively remember that as it was a right bugger holding it in place and putting it all back together, it had a tendency to cause the latch to jump out of position :-).

The motor wires are the right way round, on my motor there's a red spot on one side of the contacts so I've connected the red wire there and the black to the other non marked side.

What happens high level is the gun fires first time then locks up, pressing the trigger you can hear the motor take tension but nothing happens. I checked the piston with a torch and can see the teeth engaged on the gears. Removing the motor and pulling down on the anti reversal latch unleashes the tension and I can see the gears move.

 

Any ideas?

[RR01]

In that case no, not without looking at it. I'd suggest stripping it back down and re-assembling it to make sure everything went back in the right way the first time (presumably not as it isn't working properly). As it is moving at least once I assume the motor isn't fitted to deep into the grip.