TM 416D Died! **NOW FIXED**

[Grey]

So my trusty 416D has stopped working … broke free from the sling and dropped about 1 foot straight down onto the silencer!! ?

No sign of damage but stopped working immediately. 

Decided to have a look myself and now its sitting half stripped on my desk but thought I would ask if anyone might know what I need to get into to have a look?

Basically I was taking it apart to to see if I could see anything. 

I need it for Sunday 19th so my best option is to find the issue and order parts if something is broken. 

Logic is telling me that it has to be motor, power or trigger related as anything else would still make noise? Even if the gearbox was broken would it still try and fire? 

Any ideas would be much appreciated! 

Thanks! ?‍

 

[Emergencychimps]

Pics of how far you have stripped it down would help, assuming you've done anything.

My initial suggestion would be to check the connectors on the motor, did they come off? Then test with the motor out of the grip, connectors on then add the battery. To do this remove the pistol grip base plate and are there 2 wires connected to the motor? 

Are there any upgrades or MOSFETs? 

 

[Grey]

Thanks for the quick reply!

I’ll do the motor now.

As far as I know this is a stock gun.

View attachment 91921

Tested and nothing. 

Did the test with both mag in and mag out. I have a broken mag that allows dry fire.

View attachment 91922

 

[Nick G]

Not a RIF I have, but isn't there a system in these (lever?) that stops it firing when the mag is empty ? I'd be looking at that, maybe something got forced out of place when it hit the ground. If that's the case then the mag that alows dry firing wont alow it to cycle either.

 

[Emergencychimps]

Thanks for the quick reply!

I’ll do the motor now.

As far as I know this is a stock gun.

View attachment 91921

Tested and nothing. 

Did the test with both mag in and mag out. I have a broken mag that allows dry fire.

View attachment 91922

Have you got both the red and the black wire connected to the motor? Can't tell from this angle. Also - whats going on with the battery plugs? looks like there is 2 coming off the rif. 

As for the cut off, there is a mechanical cut off for it, but I'd rather exclude this first before encouraging someone to open their gearbox (at the very least you'd need to remove it from the lower), especially if they aren't that experienced at it. 

 

[Lozart]

Thanks for the quick reply!

I’ll do the motor now.

As far as I know this is a stock gun.

View attachment 91921

Tested and nothing. 

Did the test with both mag in and mag out. I have a broken mag that allows dry fire.

View attachment 91922

Do you have a spare motor you can do the same test with? Or another gun you can borrow one out of?

 

[Grey]

Not a RIF I have, but isn't there a system in these (lever?) that stops it firing when the mag is empty ? I'd be looking at that, maybe something got forced out of place when it hit the ground. If that's the case then the mag that alows dry firing wont alow it to cycle either.

Yes you’re right. I tested with a mag that allows this gun to dry fire.

Maybe the bolt stop feature is something to look at ?

Have you got both the red and the black wire connected to the motor? Can't tell from this angle. Also - whats going on with the battery plugs? looks like there is 2 coming off the rif. 

As for the cut off, there is a mechanical cut off for it, but I'd rather exclude this first before encouraging someone to open their gearbox (at the very least you'd need to remove it from the lower), especially if they aren't that experienced at it. 

Yes, motor was connected up with both wires. This gun has a Lipo mod and can run two batteries. 

I’m going to try and connect the motor to another battery out of the gun to make sure. 

Do you have a spare motor you can do the same test with? Or another gun you can borrow one out of?

Unfortunately I don’t have another motor to test.

 

[Grey]

I'm going to be working on this today.

Watched a video about taking it apart and saw where the spring sits for the empty mag detection feature so I'm hoping that might have popped off! ?

Lets see what happens ....

 

[Emergencychimps]

I got the impression it was now dry firing and therefore ok? Still having issues? 

 

[Grey]

Nope…still the same issue. 

I have a specific mag that lets me dry fire it and that wasn’t working when i was testing. 

View attachment 91962

 

[Grey]

So now completely opened up!

Theres nothing that’s missing or out of place. 

I’ll clean the contact for the trigger and see if i can test it before i put it back together.

I’m not sure how the white piston needs to be set for reassembly so I’ll have to look that up. If anyone knows please let me know. 

View attachment 91963

 

[Emergencychimps]

My suggestion at this point would be to stop, connect the motor up, attach a battery and "pull" the trigger (move the bit to simulate a trigger pull). Does it turn the motor? 

If not you have a break in the circuit and that is what needs sorting. 

Also, make a not of any shims, where they are etc so you can replace them exactly when reassembling. 

When I reassemble I have the piston forward. assuming it's not caught on the gears it'll go forward when you add the spring anyway. 

Also, I'd check the lever thing is moving up and down freely at the back. 

 

[Grey]

I’ve tested the circuit and it works - from buffer to motor with a pull of the trigger.

On visual inspection everything looks fine. Nothing broken and nothing out of place - except the piston spring that wasn’t attached to the piston. I think this might be aftermarket as it looks bigger than the standard ones I’ve seen in videos. 

I’m going to slowly start to reassemble and see how that goes. 

 

[rj1986]

If you can remove the spring without the piston coming out it's aftermarket as TM springs are glued into the piston iirc.

For the bolt stop, you can literally put your finger inside the mag well and push the bolt release up inside.

 

[Emergencychimps]

Did you get it working after reassembling? I guess from a lack of follow up it's yes. 

 

[Grey]

Nope! Not only that, I snapped the solder connection on the buffer tube!

Theres a chance its not working because of the connection so I'll probably send it to a shop now.

I did disassemble again so will look to carefully put it back together and try to solder and see how I get on.

I'll keep the thread updated to completion just in case someone else ever has this issue.

 

[Grey]

It LIVES!

So just to close this off - after taking it apart a couple of times and testing where everything worked, everytime I reassembled and tested it didnt work.

In the end I gave in and dropped it to Wolf Armouries.

The tech initially had the same issue as I did with parts working when disassembled and then not working when assembled. He finally traced the fault to a tiny bit of corrosion on the motor that the initial drop must have dislodged.

I'm happy to have the gun back - working and serviced with new lipo connections and happy with the service I recived from Wolf.