M100 Spring too much in G36C?
 

I have a stock TM G36C and I just replaced the bushings with G&P 6mm metal bushings, I replaced the spring guide with a Systema Area 1000 Metal Spring Guide (non-bearing style). I also added a SystemA M100 spring and the v3 Gearbox just wont crank over. I tried a full size 8.4 V battery and it's still not enough so I put the stock TM spring back in and all is good. Am I missing something here? Do I need any other parts to make this M100 spring work? The spring looks about an inch longer than the stock TM spring...is there a difference between a V2 and V3 mechbox spring?

Any help would be appreciated

Bad shimming (you need to reshim when you change the bushings or gears), crappy battery, or not very charged battery.

Thanks for the advice, but I did reshim and it's perfectly shimmed now. As I mentioned in my post, it turns fine with the old spring so the shims are not the issue. I tried three different batteries. Is there a different spring for a v3 gearbox?

i had the same problem with a tm m4a1 ,and it was down to the motor being to small, upgraded to a eg1000 and all was fine

Nope...same springs.

Are the gear axels turning freely in the bushings...i.e. take the cylinder/spring bits out and just turn the gears by hand with the mechbox all screwed together tight.

If your bushings aren't seated flush, they'll bind. If the axels are out of spec, they may drag. When the mechbox is done up tight, the shell might be torquing and throwing the shimming off.

If you're 100% sure the shimming is set...try the stock spring again. If it works...either your motor is weak or your battery isn't supplying enough juice (could be nicks in the wiring too).

Main springs for the V2 and V3 are the same.

It has an EG1000 motor already

Gears turn just fine and bushings are seated fine, I took the gearbox apart multiple times when I was shimming it to ensure all was good.

As per my post, the stock spring works fine.

I have tried three different batteries (biggest being an 8.4V 3800 mAh NiMH) and none of them can compress the M100 spring all the way...maybe the M100 that I bought is not really an M100?

When I removed the stock spring, there was that metal "plug" about 1/2" long inside the piston that the head screws back into...I had to put it back in to screw the piston head back on, but I am thinking that the extra 1/2" less space for the spring to compress may not be helping. Also would a bearing spring guide help? Is a SystemA M100 too much for a stock TM V3 gearbox and is there anything else I can do to get the spring to compress all the way?

i reused the old tm alloy spring retainer when i upgraded my m4, with gearbox assembled push a rod through the nozzle and push piston back manually to see if it travels far enough back, could be that the spring coils are binding as to long.
if this is the case remove the alloy plug and replace with a nut and washer to give extra clearance

Make sure your using fully charged batteries. And check the wires for any bare spots, if found check the fuse and fix (rewire don't tape).

This has happened to me before. Do you have another spring you can check it against?

The only other spring I have is a M120 which "may" be even harder to compress if the M100 is actually an M100.

What motor was "too small"? If an EG700, it has more torque than the EG1000, and also has less whine. I swear by the EG700s, really don't like the EG1000 much.

dont use m100 spring for v2 gearbox. just get m120 or m110

...what? No.

Don't make useless posts when you have no idea what your talking about.

Your best bet is to get another M100 spring. As has been posted previously, AEG springs are universal (except the PSG-1). It could very well be that your M100 is not really an M100. I base this on the fact that you have tried multiple batteries and your EG1000 motor should be able to pull an M100. There are differences between different company's M100 springs as well as differences between M100 springs from the same company.

I have had this happen with King Arms M110 springs. I bought two at the same time and put them into two separate M4's. The first M4 shot 370 FPS while the second one shot 430 FPS. No reason for "identical" springs to do this.

Good Luck!

I put an M120 in mine, and I've got a 9.6er runner her. If it's just a matter of your battery being too weak, which doesn't really sound right to me, you need a stronger one.

same

I'm 99% certain that your battery is too weak.

Get a 9.6 large or a lipo.

I had a G36 where m110 wouldn't be pulled by even an 9.6v mini so maybe the same is the case with an m100.

That said, different batteries, despite their ratings have different pull strength because C ratings (how much the battery can discharge in amps) are not advertised on nimh batteries whereas they are on lipo batteries. I find stock JG 8.4v minis can pull almost anything. I've pulled an m130 spring with those.

+1