ICS M4 Electric Whining sound.

Pyrohair · August 8th, 2010, 17:36

About 4 months ago I bought an ICS M4A1 and it has performed perfectly until about a week ago. One day not too long after a game I went to test fire the gun when it started to give an electrical whining sound. Other people have possibly described it as a grinding sound but It sounds too electrical for me. I am thinking that the battery is dead so I charged it to full and still the same sound was made. After reading some other posts, I just got confused between all the possible different problems so I decided to give it a go here.

Can anyone think of what the problem may be? Any help would be greatly appreciated!

Spawn28 · August 8th, 2010, 17:52

I would check your motor hight first and is the gun jammed by chance?

Pyrohair · August 8th, 2010, 17:56

Yeah, I checked to see if it was jammed. its not, And how do i check the motor height? I am kinda new to this whole gun troubleshooting thing...

dpvu · August 8th, 2010, 18:11

Split the receiver and look in the upper/lower for signs of damage or a stripped piston or stripped gears (specifically that top sector gear). If you don't see any it's probably your motor height being set incorrectly. If it's not that you're going to have to open the lower to take a look (could be a stripped pinion gear or spur gear).

Pyrohair · August 8th, 2010, 18:15

Ok, I'm new to this, How do i change the motor height? The screw on the bottom of the handle?

dpvu · August 8th, 2010, 18:16

Quote:

Originally Posted by Pyrohair

Yeah, I checked to see if it was jammed. its not, And how do i check the motor height? I am kinda new to this whole gun troubleshooting thing...

The motor height is set by the screw under the grip. If it's too high or too low you'll hear strange noises. Usually too high and you'll hear more of a mechanical grinding and too low you'll hear a combination of grinding and the motor's electric whining. Try adjusting this screw.

Pyrohair · August 8th, 2010, 19:00

Ok, So I opened the gun and took out the Upper part of the gearbox. I ran the lower gearbox and it sounded not too bad (coming from someone with not much experience) but it sorta sounded like there was a small piece of debris somewhere in there. I checked and there was nothing. I looked at the upper gearbox and nothing seemed to be out of the ordinary. I'm not sure how far the black arm is supposed to pull back but it pulled back about 1/2 - 3/4 of an inch. I also spun the gears in the lower gearbox and they moved with a bit of resistance. After all that, i put the Upper gearbox back on and it made the same never ending electric whining sound.

Any ideas?

HKGhost · August 8th, 2010, 19:10

I think you might want to start learning about the internals now. Open up the gearbox and see if there is anything that broke off or something that's loose. Check out http://www.mechbox.com/ to see how to open it up. Also check on youtube. There's lots of instructional videos on how to do it. If all fails, look up a gundoc in your area for help.

Pyrohair · August 8th, 2010, 19:13

So you think its an Internals problem?

HKGhost · August 8th, 2010, 19:21

If you're motor is whining or something is grinding, it must be the internals. It could be a bad shim job or a bunch of other things that caused parts to fail or about to fail. Best way to check for the problem is to open her up. But since you don't have a whole lot of experience, research and learn everything you can before you go ahead. You don't want to fuck it up even more. If you're nervous, look up a gundoc would be the best.

Spawn28 · August 9th, 2010, 13:10

its even possible it could be the gear on the end of the motor might be spinning freely from the shaft.

No Offence but the explaination is a little vague and it happens to be one of the problems that could be the result of many different reasons.

Agreed with HKGhost goto mechbox.com and start learning or take it to a gunsmith in your area.

voorhees -FWA- · August 9th, 2010, 13:33

it's more than likely your bevel gear... there's a little spur gear that is pressed in to it and it contacts the larger spur gear, it may have spun free and it sounds like grinding gears when the rifle is together but when you split the gearbox and fire it it seems to work fine...

Schwag · August 9th, 2010, 15:58

if the gun was good for 4 months and you can't see any damaged or broken teeth on your gears then it is probably motor height. It's the most likely and simplest to fix.

It's the screw on the bottom of the handle. Usually needs a tiny hex key.
Screw it down a quarter turn and see if the noise changes when you fire a single shot.
If so, there's your problem and you just need to work it up until it sounds healthy.

If that is the issue, it's most likely moved down over the 4 months.

If that doesn't work, see a gun doc

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August 8th, 2010, 17:36	#1
Pyrohair Trader rating Join Date: May 2010	ICS M4 Electric Whining sound. About 4 months ago I bought an ICS M4A1 and it has performed perfectly until about a week ago. One day not too long after a game I went to test fire the gun when it started to give an electrical whining sound. Other people have possibly described it as a grinding sound but It sounds too electrical for me. I am thinking that the battery is dead so I charged it to full and still the same sound was made. After reading some other posts, I just got confused between all the possible different problems so I decided to give it a go here. Can anyone think of what the problem may be? Any help would be greatly appreciated!

August 8th, 2010, 17:52	#2
Spawn28 I am manly hear me squeek Trader rating Join Date: Apr 2007 Location: North Bay The Gateway to Hells Ars!	I would check your motor hight first and is the gun jammed by chance? __________________

August 8th, 2010, 18:11	#4
dpvu Trader rating Join Date: Mar 2008 Location: Calgary	Split the receiver and look in the upper/lower for signs of damage or a stripped piston or stripped gears (specifically that top sector gear). If you don't see any it's probably your motor height being set incorrectly. If it's not that you're going to have to open the lower to take a look (could be a stripped pinion gear or spur gear). __________________ JG HK416 KWA USP

August 8th, 2010, 17:56	#3
Pyrohair Trader rating Join Date: May 2010	Yeah, I checked to see if it was jammed. its not, And how do i check the motor height? I am kinda new to this whole gun troubleshooting thing...

August 8th, 2010, 18:15	#5
Pyrohair Trader rating Join Date: May 2010	Ok, I'm new to this, How do i change the motor height? The screw on the bottom of the handle?

August 8th, 2010, 19:00	#7
Pyrohair Trader rating Join Date: May 2010	Ok, So I opened the gun and took out the Upper part of the gearbox. I ran the lower gearbox and it sounded not too bad (coming from someone with not much experience) but it sorta sounded like there was a small piece of debris somewhere in there. I checked and there was nothing. I looked at the upper gearbox and nothing seemed to be out of the ordinary. I'm not sure how far the black arm is supposed to pull back but it pulled back about 1/2 - 3/4 of an inch. I also spun the gears in the lower gearbox and they moved with a bit of resistance. After all that, i put the Upper gearbox back on and it made the same never ending electric whining sound. Any ideas?

August 8th, 2010, 19:10	#8
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	I think you might want to start learning about the internals now. Open up the gearbox and see if there is anything that broke off or something that's loose. Check out http://www.mechbox.com/ to see how to open it up. Also check on youtube. There's lots of instructional videos on how to do it. If all fails, look up a gundoc in your area for help. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

August 8th, 2010, 19:13	#9
Pyrohair Trader rating Join Date: May 2010	So you think its an Internals problem?

August 8th, 2010, 19:21	#10
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	If you're motor is whining or something is grinding, it must be the internals. It could be a bad shim job or a bunch of other things that caused parts to fail or about to fail. Best way to check for the problem is to open her up. But since you don't have a whole lot of experience, research and learn everything you can before you go ahead. You don't want to fuck it up even more. If you're nervous, look up a gundoc would be the best. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

August 9th, 2010, 13:10	#11
Spawn28 I am manly hear me squeek Trader rating Join Date: Apr 2007 Location: North Bay The Gateway to Hells Ars!	its even possible it could be the gear on the end of the motor might be spinning freely from the shaft. No Offence but the explaination is a little vague and it happens to be one of the problems that could be the result of many different reasons. Agreed with HKGhost goto mechbox.com and start learning or take it to a gunsmith in your area. __________________

August 9th, 2010, 13:33	#12
voorhees -FWA- Trader rating Join Date: Oct 2008 Location: Estevan, Saskatchewan	it's more than likely your bevel gear... there's a little spur gear that is pressed in to it and it contacts the larger spur gear, it may have spun free and it sounds like grinding gears when the rifle is together but when you split the gearbox and fire it it seems to work fine...

August 9th, 2010, 15:58	#13
Schwag Trader rating Join Date: Sep 2006 Location: A sick fascist corporatocracy.	if the gun was good for 4 months and you can't see any damaged or broken teeth on your gears then it is probably motor height. It's the most likely and simplest to fix. It's the screw on the bottom of the handle. Usually needs a tiny hex key. Screw it down a quarter turn and see if the noise changes when you fire a single shot. If so, there's your problem and you just need to work it up until it sounds healthy. If that is the issue, it's most likely moved down over the 4 months. If that doesn't work, see a gun doc __________________ (Former)Grand Poobah of T.W.A.T.

ICS M4 Electric Whining sound.

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