Jump to content


What Does It Mean When Your Sector Gear Is Spinning Freely?


  • Please log in to reply
2 replies to this topic

#1 Doctor Kajita

Doctor Kajita

    Enthusiast

  • Members
  • PipPip
  • 163 posts
  • Location:San Francisco, CA

Posted 04 October 2008 - 10:37 PM

I posted this on Airsoft Forum, but thought I would post here too since this is my KWA M4.

Quote

I recently took my Version 2 gear box apart and reassembled it following several guides. I appeared to have done it right as the gun functioned normally when I briefly tested it earlier this week and when I played 1 1/2 CQB games today.

The issue began when I heard a subtle grinding noise when I fired my gun. BTW, it is a KWA M4.

I immediately stopped playing and disassembled the gear box. When I was trying to remove the upper receiver, it wouldn't allow me because the piston hadn't moved to the relieved position. I'm not sure if this is the case for other M4 guns, but you can't split the receiver on the KWA one if you don't fire it in semi-auto before as the receiver tabs come in contact with the piston rails (the thing the piston rides on).

Anyway, with this in mind, I concluded that the sector gear teeth was not properly seated in the piston's teeth because I had fired it in semi-auto before disassembling and it didn't move the piston. Yes, it did make the subtle grinding noise when I fired it.

Can someone tell me if I'm correct in my assessment and if so, why? Did I time the gears wrong? I put the little notch at the 1 to 2 o'clock position, but I probably did something wrong. Maybe the tappet plate?

SOURCE

Edited by Doctor Kajita, 04 October 2008 - 10:40 PM.


#2 vic_man4

vic_man4

    Specialist

  • Members
  • PipPipPip
  • 591 posts
  • Location:Niagara, Ontario, Canada
  • Interests:Airsoft, XBox 360 (GamerTag = CovertMaz), Cars, and HEAVY METAL \m/

Posted 05 October 2008 - 04:52 PM

View PostDoctor Kajita, on Oct 4 2008, 10:37 PM, said:

I posted this on Airsoft Forum, but thought I would post here too since this is my KWA M4.

Sounds like a gear timing issue, I have never had a issue with gear timing, I dont even know why it matters, but others say that your gears have to put in the same way you took them out :/ Dont quoate me on this.

#3 Doctor Kajita

Doctor Kajita

    Enthusiast

  • Members
  • PipPip
  • 163 posts
  • Location:San Francisco, CA

Posted 06 October 2008 - 03:23 PM

I guess it could be a number of things.  I guess it doesn't necessarily need to be the sector gear that was out of place.  If one gear isn't engaging, the rest will not either, so who knows.  All I know is no damage was apparent on any of the gears or piston.

I put it all back together again and hope to try it out later.  I made a mistake in installing the trigger so there's engagement of the motor, but that should be an easy fix.

The good news is, I am learning and getting good at disassembling and reassembling the gear box.  The bad news is, I don't know if I'm doing a good job or not :)




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users