sir john Posted April 29, 2022 Share Posted April 29, 2022 Hi AllI have a class D16/3 loco purchased new about a month ago ran it in on rolling Road added a decoder runs OK on straight track going round curves almost slows to a stop on 2nd 3rd and 4th radius curves .Have checked the back to back measurements all ok pickups making good contact does this light engine or pulling stock all my other locos perform fine have cleaned the track makes no difference any suggestions gratefully received Regards john Link to comment Share on other sites More sharing options...
96RAF Posted April 29, 2022 Share Posted April 29, 2022 Check the gauging on the track, especially if flexi-track has been used as it can nip in if pulled too tight. Link to comment Share on other sites More sharing options...
sir john Posted April 29, 2022 Author Share Posted April 29, 2022 Hi Raf it's set track so don't think it's thatJohn Link to comment Share on other sites More sharing options...
morairamike Posted April 29, 2022 Share Posted April 29, 2022 Although you have checked the back to back, have you checked that when the two driver axles are fully to left or right that then flanges are in-line front to back.It may be advisable to make the front driver back to back slightly tighter to accommodate the curve. I say this as my 2-6-4 MT suffered this and tightening the b to b on the centre axle fixed it. Yes I know yours is a 4-4-0.It is possible that the b to b on the tender is too big. Link to comment Share on other sites More sharing options...
sir john Posted April 29, 2022 Author Share Posted April 29, 2022 Thanks I'll try that over the weekend Link to comment Share on other sites More sharing options...
sir john Posted April 30, 2022 Author Share Posted April 30, 2022 Tried all the suggestions all to no avail changed the decoder now works fine Thanks for your advice Link to comment Share on other sites More sharing options...
ColinB Posted April 30, 2022 Share Posted April 30, 2022 What make decoder was it? Link to comment Share on other sites More sharing options...
sir john Posted April 30, 2022 Author Share Posted April 30, 2022 Colin It was an old bachmann I'd had for years in another loco changed it for my decoder of choice (zimo) now runs fine Link to comment Share on other sites More sharing options...
96RAF Posted April 30, 2022 Share Posted April 30, 2022 Maybe bemf was turned off. Link to comment Share on other sites More sharing options...
sir john Posted April 30, 2022 Author Share Posted April 30, 2022 Quite possibly but I programmed it with my ncc power cab so should have been OK maybe the decoder was defunct it was like me passed its prime Link to comment Share on other sites More sharing options...
ColinB Posted April 30, 2022 Share Posted April 30, 2022 I have had lots of issues with Bachmann decoders so I am not surprised. There was a YouTube video where a guy was complaining about them. Link to comment Share on other sites More sharing options...
rpjallan Posted May 1, 2022 Share Posted May 1, 2022 I only have one Bachmann branded decoder, in a Bachmann LMS G2. I’m pretty sure it is a re-branded ESU decoder. It’s a beautiful runner but it was an absolute dog until I removed all the capacitors from the motor. Link to comment Share on other sites More sharing options...
Flashbang Posted May 1, 2022 Share Posted May 1, 2022 Bachmann 21 pin are ESU decoders in both their sound and non sound DCC fitted locos. They apparently have now switched to Zimo in their latest Plux22 and Next18 decoder fitted locos. Link to comment Share on other sites More sharing options...
Brew Man Posted May 1, 2022 Share Posted May 1, 2022 Am I missing something? sir john didn't mention which decoder he'd installed. Link to comment Share on other sites More sharing options...
sir john Posted May 1, 2022 Author Share Posted May 1, 2022 Brewman it was a zimo mx600r I find them excellent John Link to comment Share on other sites More sharing options...
Brew Man Posted May 1, 2022 Share Posted May 1, 2022 You're not the only one to sing the praises of Zimo. I don't have any myself, but no doubt I will eventually. Link to comment Share on other sites More sharing options...
ColinB Posted May 1, 2022 Share Posted May 1, 2022 Yes, virtually all my locos are Zimo, they are the only ones that have never failed on me without a valid reason. AT Hornbys recommended retail price they are virtually the same price. Similarly most of my sound ones are either Zimo or Hornby (mainly because of the cost). That is interesting that Bachmann have switched to Zimo, I assumed that they were LoKSound, especially in the locos I bought with sound prefitted. Now I have finally got my new type Zimo sound decoder working in my O1 (bought a new DCC controller), that sound is even better. Link to comment Share on other sites More sharing options...
ColinB Posted May 5, 2022 Share Posted May 5, 2022 Here is something I noticed yesterday with my City of Manchester. Now I know the wheel arrangement is somewhat different to a D16 but it is worth mentioning. My loco kept derailing and stopping on a particular piece of track, all my other locos had no issue with this piece of track. Then I noticed there was excessive movement in the side to side movement of the centre wheel. What it appears is happening because of the excessive movement the valve gear locks up causing the derailment and stopping. The piece of track it happens on, is a tighter curve than the rest of my layout which has sweeping bends. This bend is definitely larger than second radius but obviously not as large as my other bends. I bought the chassis second hand and I tested it on my straight piece of test track, but looking at it there is far too much movement of the axles within the bearings. I have ordered some new wheels so hopefully that will fix it. So it is a fault worth considering. Link to comment Share on other sites More sharing options...
sir john Posted May 6, 2022 Author Share Posted May 6, 2022 @ColinBMine was purely a decoder issue swapped out the old bachmann for a zimo now runs superbly pulls a rake of teaks no slowing down even on second radius curves job done John Link to comment Share on other sites More sharing options...
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