|
|||||||||
|
Home | Forums | Register | Gallery | FAQ | Calendar |
Retailers | Community | News/Info | International Retailers | IRC | Today's Posts |
|
Thread Tools |
July 19th, 2006, 00:47 | #1 |
My TM M4 Is Having a Hard Time Cranking
I recently bought a used M4 so I could learn how to work on it. I just put in an M120 spring and Guarder metal bushings. I also reshimmed it using systema shims.
Basically what is happening is that it seems like it needs a lot of juice to get the gun firing. If my battery is a little low it will just draw the piston back but wont bring it back far enough to let it go foward. If I fire it fully auto it will be fine unless I keep firing it fully auto in bursts. When I do this it sounds like the battery is about to die. I can hear it have a hard time trying to spin again but once it gets going it sounds fine. I'm using a 9.6v battery and it is working fine on my commando that has an M120 as well. What do you think could be causing this problem. I am just about to crack this thing open again but wanted to see what you guys thought might be the problem first. Thanks! |
|
July 19th, 2006, 00:49 | #2 |
Could be that the motor is situated too "high" up. Try lowering it via the adjustment screw.
|
|
July 19th, 2006, 00:50 | #3 |
Put in a lighter spring, or get a big-ass battery. Seriously. I just bought a Non-working Marui MP5 SD5 with this same problem. Even my largest battery would not crank that sucker over. When I opened it up the spring was the strongest I've ever seen, and I've seen %200 PDI springs. I put in an SP110 and it worked like a charm.
__________________
Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy. |
|
July 19th, 2006, 00:54 | #4 |
It could also be a bit over shimmed or underlubed. (or horribly over)
Take that into consideration too... A big ass battery in a crane stock is always a great idea though. |
|
July 19th, 2006, 03:56 | #5 |
I never touched the adjustment screw for the motor. I don't want to mess with it if I really dont need to. Do you really think its this?
I was thinking that it might be over shimmed as well. But when I closed up the mech box and turned the gears, they would turn with little effort. Does this change when everything is put back together? Should I have a tiny bit of play in the axels of the gears when I reshim? Right now I have pretty much no play in any of the gears except the bevel gear has a tiny bit. |
|
July 19th, 2006, 09:45 | #6 |
The M120 is a strong spring. If you still use the mini 600mah battery, dont be surprised.
|
|
July 19th, 2006, 14:08 | #7 | |||
GBB Whisperer
|
Quote:
Quote:
Quote:
|
|||
July 19th, 2006, 15:03 | #8 | |||
Quote:
Quote:
Quote:
|
||||
July 19th, 2006, 15:43 | #9 | |
Quote:
|
||
July 19th, 2006, 16:37 | #10 |
Then you have other setup problems. Re-check your mechbox entirely, or find a local expert.
|
|
July 20th, 2006, 02:36 | #11 | |
Quote:
|
||
July 20th, 2006, 11:52 | #12 |
This stuff has to be looked-at directly, discussing it online will only create a repeated list of anything that can go wrong, and even then... you have to see the thing.
So again, find a local expert. Canada is not local to you. |
|
|
Bookmarks |
Thread Tools | |
|
|