TypsJunction

38 minutes ago, SR71 said:

It looked like the valve gear was clashing but that last video shows you have bigger concerns. The gear shouldn't spin on the axle like that.

 

If you've spun the gear on the axle  and the jump happens at the same point in the rotation it's almost certainly valve gear / motion related. It doesn't look like the gear is slipping in your other videos so I don't think that is the cause though it may have been caused by your problem.

 

Trouble is even if you do find the cause that slipping gear is going to stop it pulling much. I don't know the history of these models so it might be worth searching to see if it's a known fault?

 

 

Okay, the slipping is a bit of a concern, however did require a little force from me to occur. The loco still happily takes my take I need it to pull around.

I genuinely cannot seem to find the issue with gears which seem to be causing the problem (the axle gear and the adjacent one). Ran both through with a fine flathead in ever notch, but no change. The way this is happening makes me think it was a factory issue (told it’s never been ran, whether that’s true or not though.)

It seems the issue may be coming from this gear with this slightly wider notch but I somehow feel this wouldn’t make such the major ‘bounce’ and is probably a design feature anyway. 

3 hours ago, SR71 said:

Can you film the same as above but running a bit slower/longer and keeping the camera more in one place. It looks likely to be an issue with the motion.

 

Edit also looking at the other side too. Having just played at 0.25 speed the motion this side looked ok.

Thank you for your reply. 
Here’s a video of it running slower, hopefully is okay. 
 

I’ve also got a video of me holding wheels in place and axle gear still spinning (not great I know), but proves issue isn’t with the wheels or con rods.

Another video of the bottom of the chassis showing one axle wobbling about.

Hi all,

Just purchased a Bachmann 7F from online. Been told it has never been run, and to be fair it is in excellent condition.

Ran it for the first time shortly ago however every wheel rotation the model seems to ‘jump’. Seems to be coming from somewhere in the mechanical at the cab end.

I’ve no experience in mechanisms or taking models apart to a large extent so any help would be appreciated.

Thank you.

video of loco running issue as YouTube unlisted link

Hi, I purchased a 6 function LaisDCC decoder and I’ve now put it inside the 08. 
Now, the shunt lights at one end are always on, whilst the rest of the functions operate normally.

F2 turns on/off the shunt lights at only the one end (like before) whilst F3 makes the other end lights go ever so slightly dimmer and seems to make the loco jitter with no influence of movement or stopping from the controller, forcing me to switch the power off. (Photos of the lights before and after F3, become slightly dimmer, attached)
All seems rather odd 😂

Any help on wether these issues can be fixed would be great 

Thank you

14 hours ago, Kaput said:

I think the Lais one has the correct type of functions for  the 08 but it might depend on the version of your 08 - I believe the 2nd batch have extra lightning functions and might need an 8 function.

Ok thank you, how do I find out if my model is from the second batch?

38 minutes ago, Kaput said:

Pretty sure the Soundtraxx ones are only 4 function.

5 minutes ago, Nigelcliffe said:

 

I put the model number into Google.  The first hit was this page

https://soundtraxx.com/products/dcc-mobile-decoders/mc1h104p21/

 

(same result from DuckDuckGo and Bing ).  

 

 

- Nigel

Ah thanks, I suppose that’s the answer!  - 4 Function it is.

Would this be the one for the job to allow all lights to be controlled, LaisDCC 21 Pin 6 Function decoder?

https://www.ebay.co.uk/itm/Laisdcc-21-Pin-Dcc-Decoder-6-Function-/125150128114?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=710-127635-2958-0

On 17/04/2022 at 14:57, Kaput said:

Bachmann have multiple 21pin decoders so you'll need to be more specific, product code and colour of the chip are needed (2 of the 21pin decoders share product code but are very different, the newer one is 6 function but 2 of the functions are logic level the Dapol 08 might need full power ones).

Hi,

Taking a look at the chip now, on the top it reads Rev A and on the bottom SoundTraxx and MC1H10421P. All on a green PCB. I believe the chip was purchased in 2016.

2 Photos of the chip are also attached.

So, would this not be a 6 function chip? 
Thank you

Hi 👋

I recently purchased a Dapol O Gauge 08 and ran it on DC for a period. On DC the top headlights at either end work when in the appropriate direction.

I then fitted a standard Bachmann 21 pin decoder to the model, which should allow at the press of a function key to turn on the bottom white and red shunting lights at both ends. However, the shunting lights only appear at one end and not the other. So I’m short, headlights work at either end however shunting lights only work at one end. 
Would anyone have any ideas why this happens?
I’ve struggled to look but I believe the shunting lights at the non working end are all connected up with no obvious wire damage which leads me to believe it’s a decoder / DCC issue. DCC isn’t really my strong suit so if it is the issue, an explanation on how to fix would be greatly appreciated.

Thank you in advance.