ICS M4 Grinding Gears
 

My friend has a ICS C15 and had it for about 4 months and when ever he fires it, it makes a weird noise and the nozzle moves abit and back and no barely any air.

I tried mortar height, I tried different upper gearboxs with mine and his, I opened his lower gearbox and nothing I could see a problem maybe not perfect shimming, and tried different batteries.

I'm thinking most likely the lower gearbox and I fired it without a upper gearbox and it spins but once I put the upper it does a noise of awfulness .

With the battery disconnected,open the two halves and turn the gears by hand. You will be looking for any sheared off gear teeth on all of the gears. go here for good tutorial on dissasembly/reassembly.

These are not ics teardowns but can still be used as a guide as the ics is close to a tm ver 2 mech

http://www.mechbox.com/m4m16/m733-disassembly.html

http://www.mechbox.com/m4m16/m733-reassembly.html

it's more than likely the gear (the one that connects to the spur gear) that's pressed into the bevel gear.

Easy way to check: take the motor out and the grip off... use a small screw driver and try to spin the bevel gear; if it spins freely, that's the problem.

You can also try this:

Open the gun in half.
Press the anti-reversal lever against the gear (backwards).
Fire the gun ONCE on SEMI.

If the top gears are not moving, the pinion got loose on the motor.

For some reason, it would be the 4th ICS M4 that has this problem this week...

Just bevel gear was gridded and replaced it with a dboys gear. Thanks guys.