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November 19, 2017, 08:20:33 PM
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Author Topic: 4-8-2 pilot truck  (Read 3639 times)
TJ

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« on: June 09, 2017, 12:39:02 PM »

 All,

   I have a BACHMANN SPECTRUM 4-8-2 when I run it at a moderate speeds the pilot truck tends to derail, anyone happen to have any ideas to curb this issue?

TJ
« Last Edit: June 09, 2017, 12:43:33 PM by TJ » Logged
kmcsjr


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« Reply #1 on: June 09, 2017, 01:29:49 PM »

Hi
Light or Heavy. The newer Heavies should do 9.75, with no issues. Light Mountains can't do less than 11 slowly and have pilot truck derailments, even then.
So, if it's a heavy, I recommend watching it, with LED lit magnifying specs and see it'd it's trackwork, or wiggling something. If it's a Light Mountain, I haven't seen a solution, sorry.
Edit - Spookshow has a write up on these. While there is no solution offered, he does show a completely disassembled Heavy. Since the heavy doesn't have an inherent derailing issue, maybe you will note a mod you can make?
« Last Edit: June 09, 2017, 01:55:50 PM by kmcsjr » Logged
TJ

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« Reply #2 on: June 09, 2017, 02:31:31 PM »

Hi
Light or Heavy. The newer Heavies should do 9.75, with no issues. Light Mountains can't do less than 11 slowly and have pilot truck derailments, even then.
So, if it's a heavy, I recommend watching it, with LED lit magnifying specs and see it'd it's trackwork, or wiggling something. If it's a Light Mountain, I haven't seen a solution, sorry.
Edit - Spookshow has a write up on these. While there is no solution offered, he does show a completely disassembled Heavy. Since the heavy doesn't have an inherent derailing issue, maybe you will note a mod you can make?
it's the Light 4-8-2 .

TJ
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spookshow


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« Reply #3 on: June 09, 2017, 05:20:26 PM »

I never did figure out why the pilot truck always derailed on my light 4-8-2. I eventually just punted on it in favor of a heavy 4-8-2.

-Mark
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Mike C

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« Reply #4 on: June 10, 2017, 10:21:59 AM »

Hmm, that's odd , I have both and never had any problems with the light mtn . My last layout had 11" curves in places , but my newest layout has 15 1/2 " min curves .
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spookshow


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« Reply #5 on: June 10, 2017, 10:34:30 AM »

It also depends on which Light 4-8-2 you're talking about. The original 2003 version was the one that I had all the problems with (mainly on 11" or sharper curves). The revised 2012 version (with the DCC-Ready tender) has never given me a lick of trouble.

-Mark
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kmcsjr


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« Reply #6 on: June 10, 2017, 03:17:34 PM »

So
As the "if Bachmann makes steam, I buy it, guy". Is there a way to tell which model it is 2012 vs earlier release. (since almost all buying is online)
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spookshow


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« Reply #7 on: June 10, 2017, 03:59:27 PM »

The newer version has a bunch of wires running between the locomotive and the tender. The older version does not.

-Mark
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Maletrain

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« Reply #8 on: June 21, 2017, 12:30:44 PM »

I bought one of the later version Light Mountains, and had the same problem with the pilot truck derailing on 15" radius curves.

When I took a close look at it and the "exploded" drawing supplied by Bachmann, it looked to me like it was attached up-side-down.  So, I turned it over and it has not derailed, since.

Because it was a second-hand purchase, I don't know if that was an original Bachmann assembly goof or a previous owner goof.
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spookshow


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« Reply #9 on: June 22, 2017, 07:54:33 AM »

I haven't heard of that particular problem with the revised 4-8-2, but it wouldn't surprise me if it came from the factory that way. I know a lot of Bachmann 4-6-0's had the same issue.

-Mark
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