I have 3 issues on my Gen 9 gearbox J10 ACR by JM
- Safety not working.
I suspect it might be the spring on the selector plate. Has anyone faced this issue, that the spring is too slack, and not engaging the cutoff lever properly?
On another note, when i manually pressed the cutoff lever, and the safety catch moves upwards. But on inspection, it does not appear to perform any form of mechanical safety function on the trigger. Can someone explain how does the safety catch stops the trigger from moving in safe mode?
- I reinstalled the motor in the ACR J10. However, upon feeding with 11.1V battery, there is no plunger movement at all, only a motor spinning high pitch sound. I upgraded to a 1.25 UEQ spring but i think that is no issue for the stock motor. Could it be a stripped gear? although on inspection, the gears appear to have no visible damage.
Another reason is motor height? When seating the motor, do you guys press the motor all the way into the gearbox from the pistol grip? or do you simply let the motor closing latch on the pistol grip press onto the motor and adjust using the screw?
- How do you position the fire selector disc with respect to the select switch when reinstalling the gearbox?