ElectroCoupler opens by itself

Well, I doubt you want to take it apart, so my first attempt would be some dry graphite lubricant.  Sometimes lube will prevent them from working their way open.  Since this is a Legacy unit, the traditional electronic fix is not really appropriate.

try this, open it with remote and then take engine in your hand and slam the coupler shut. not hard enough to break it.

do this a few times.  it has worked for me. 

Another thing that works really well for me is to remove the knuckle and smooth all the mating surfaces.  Now only does this make them close butter smooth, it's solved mechanical random opening issues for me as well.

Obviously, this requires removing the knuckle rivet, so it's not really appropriate here.

I get to see this situation.  The best way is to replace the coupler.  If it is under warranty you can send it in.  If you want to do it, couplers are dirt cheap and you save your locomotive from the shipping monsters.  Do whatever works best for you.

The fixes the guys mentioned are something you can look at.  It is good advice if you want to give things a try.

John, would you educate me about this please? I'm assuming that you are referring to the traditional fix of putting a one microfarad capacitor across the coil. If that is so, why will it not work with Legacy?

Wouldn't you also want to disconnect the coupler electrically first in order to see if the problem is mechanical?

In Legacy the cap is built into the board.  You can also swap the coupler plugs on the board to confirm your issue.   Your part number for the coupler is 6204536550.  Full list is only $10.00. 

Jon Z. stated that the cap could damage the Legacy electronics and it was not needed.  I don't know if that meant it was built-in or there was some other provision made to prevent the electrical noise issue.

Marty's idea of replacing the coupler certainly works, as they're only $10 I believe.  If you have a spare, you might try smoothing the coupler inside surfaces.  It's a bit of work, but the ones I did worked great and also have very low coupling force, so you don't have to crash into a line of cars to get the coupler to close.

The cap was for R2LC and R4LC's. The new boards use DC for coupler operation and noise will not effect the coupler circut. So if there is a problem, it probably mechanical.

Bill 

Because of the new board design, the Cap will also damage the electronics.  The new Legacy boards are more like MTH PS-2 now.  You need to keep some of the functions away from AC/chassis.  They don't use Chassis Common as return anymore.  G