upgraded echo1 m733 will not fire

Craig20 · April 17th, 2009, 11:54

i upgraded the spring to M150, full teeth aluminum piston, amp 5000 motor, and a 10.8v battery, put the gun back together and does not fire. when you pull the trigger the wires get hot because nothing turns. i blew the 15amp fuse and put in a 20amp. their is a faint clicking noise when the trigger is pulled. the motor does turn because i have tested it without fully in the gun.i have opened up the gearbox many times and all three gears i think are lined up correctly with the bushings on the outside. if you hve any solutions they would be appriciated.

ujiro · April 17th, 2009, 11:58

Try taking the spring and piston out, closing up the gearbox, and trying to turn the gears by hand. You may have shimmed the gears correctly to eachother, but too much overall. If they are overshimmed, they won't spin.

kalnaren · April 17th, 2009, 12:08

Agreed. Sounds like a bad shim job, or possibly internal components binding. Make sure everything moves freely.

Nova316 · April 17th, 2009, 12:11

Either your shimming is wrong like above posters or your motor height is set wrong.
Check your shimming first, since thats usually the case when gearboxes bind up

kalnaren · April 17th, 2009, 12:13

Also, I'm not sure stock JG gears will take a 10.8v battery. If all you've changed in there is the piston and motor, I'd be expecting a bunch of other stuff to fail as well.

ujiro · April 17th, 2009, 12:19

Especially consider M733 = more likely to be used on full auto rather than semi. And full auto is where you get problems, esp. with a 10.8V battery.

Craig20 · April 17th, 2009, 12:19

the gears didn have any shims when i checked so when i put it back together i didnt put any in. ive lso herd alot about adjusting the motor but i dont know where to adjust it. it doesent even fire so i cant even use it on auto yet. its like jammed up.

ujiro · April 17th, 2009, 12:23

On the base of the grip, there should be a screw in the middle. If you tighten this, it puts the motor farther into the gearbox. If you loosen it, it brings the motor farther out of the gearbox. This sounds like the motor could be over-tightened, ie, sitting too far into the gearbox. Try loosening the screw a half turn at a time.

kalnaren · April 17th, 2009, 12:23

This isn't meant to be a slight, but if you don't know anything about mechboxes, you definetly should not be modding them for higher speed and high FPS. A stable high speed setup is difficult and costly to do. And higher FPS.. I really hope your gun has metal bushings as well. I know some JG ones come with nylon bushings.

My advice at this point is to take it to a gun doctor and get them to take a look at it.

baker_Jeff · April 17th, 2009, 12:24

You adjust the motor using the screw/set screw on the bottom of the grip. Loosen it up a bit.

Craig20 · April 17th, 2009, 12:29

alright ill try that now. i do have knowledge about mechbox. ive been using the same gun for 2 years and thought it was time for tune up and one thing led to another and ended up spending $250.

Craig20 · April 17th, 2009, 13:28

after testing. i loosened the screw and the motor wasnt hitting anything. so i kept tightning gradualy then when it up far enogh i cant hear the motor anymore and it doesent move anything.

ujiro · April 17th, 2009, 13:28

Is there a click at all?

Crunchmeister · April 17th, 2009, 14:05

If it's not the motor, then it sounds like the gearbox is locked up. Only way to fix that is to take it all apart again.

Shirley · April 17th, 2009, 14:25

You need a reinforced gearbox to run that sp150.. or you'll break that shell.. Metal bushings and high torque gears.
Check your gears that they do line up properly.

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April 17th, 2009, 11:54	#1
Craig20 Trader rating Join Date: Apr 2009 Location: Michigan	upgraded echo1 m733 will not fire i upgraded the spring to M150, full teeth aluminum piston, amp 5000 motor, and a 10.8v battery, put the gun back together and does not fire. when you pull the trigger the wires get hot because nothing turns. i blew the 15amp fuse and put in a 20amp. their is a faint clicking noise when the trigger is pulled. the motor does turn because i have tested it without fully in the gun.i have opened up the gearbox many times and all three gears i think are lined up correctly with the bushings on the outside. if you hve any solutions they would be appriciated. Last edited by Craig20; April 17th, 2009 at 17:26..

April 17th, 2009, 11:58	#2
ujiro Trader rating Join Date: Aug 2006 Location: Burlington, ON	Try taking the spring and piston out, closing up the gearbox, and trying to turn the gears by hand. You may have shimmed the gears correctly to eachother, but too much overall. If they are overshimmed, they won't spin. __________________ I love freedom and consequently America

April 17th, 2009, 12:19	#6
ujiro Trader rating Join Date: Aug 2006 Location: Burlington, ON	Especially consider M733 = more likely to be used on full auto rather than semi. And full auto is where you get problems, esp. with a 10.8V battery. __________________ I love freedom and consequently America

April 17th, 2009, 12:11	#4
Nova316 Trader rating Join Date: Nov 2006 Location: Calgary	Either your shimming is wrong like above posters or your motor height is set wrong. Check your shimming first, since thats usually the case when gearboxes bind up

April 17th, 2009, 12:23	#8
ujiro Trader rating Join Date: Aug 2006 Location: Burlington, ON	On the base of the grip, there should be a screw in the middle. If you tighten this, it puts the motor farther into the gearbox. If you loosen it, it brings the motor farther out of the gearbox. This sounds like the motor could be over-tightened, ie, sitting too far into the gearbox. Try loosening the screw a half turn at a time. __________________ I love freedom and consequently America

April 17th, 2009, 12:24	#10
baker_Jeff Trader rating Join Date: May 2008 Location: Edmonton, AB	You adjust the motor using the screw/set screw on the bottom of the grip. Loosen it up a bit. __________________ Founder of Capital Airsoft in Edmonton Out of the Game 04/22/16

April 17th, 2009, 12:29	#11
Craig20 Trader rating Join Date: Apr 2009 Location: Michigan	alright ill try that now. i do have knowledge about mechbox. ive been using the same gun for 2 years and thought it was time for tune up and one thing led to another and ended up spending $250.

April 17th, 2009, 13:28	#12
Craig20 Trader rating Join Date: Apr 2009 Location: Michigan	after testing. i loosened the screw and the motor wasnt hitting anything. so i kept tightning gradualy then when it up far enogh i cant hear the motor anymore and it doesent move anything.

April 17th, 2009, 13:28	#13
ujiro Trader rating Join Date: Aug 2006 Location: Burlington, ON	Is there a click at all? __________________ I love freedom and consequently America

April 17th, 2009, 14:05	#14
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	If it's not the motor, then it sounds like the gearbox is locked up. Only way to fix that is to take it all apart again. __________________

April 17th, 2009, 14:25	#15
Shirley A-56 aka Mr.Hitman Trader rating Join Date: Nov 2007 Location: Toronto, ON	You need a reinforced gearbox to run that sp150.. or you'll break that shell.. Metal bushings and high torque gears. Check your gears that they do line up properly. __________________ CANADIAN AIRSOFT PRACTICAL SHOOTING (CAPS) CAPS DIRECTOR # 0047

upgraded echo1 m733 will not fire

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