[karlclark]

in the last week i have noticed one of my BACHMANN 4-6-0 JUBILEE CLASS starting to get back end wobble i know a small amount about this and have tryed for many hours in solving it but still the same im asking if there is a step by step tutorial or a site i can go to see how others have fixed this or even if there is some kind of gageit to use just my 90 degrees offset just isnt working any advice would be much appreciate

many thanks
karl

 

[34C]

To cure this problem, you must know the cause: and there are a number of potential causes for what you are seeing.

First, questions that it is always wise to ask yourself in this situation.

Have I done anything to or with the loco not long before this problem became evident? Examples: got it out of a box or storage
after a period out of use; Fitted the detailing pack; Took the body off to fit a loudspeaker; etc.

Has the loco been in a collision, significant derailment, or had to be handled in a hurry to prevent an accident?

And since it is a Bachmann model which once came in split chassis flavour: does it have a split chassis?

 

[Julian2011]

Agree with what 34C said {added whilst I was typing} and perhaps might add...

Some wiggle is perfectly normal and to be expected as the drive is quartered {max pull/push one side then the opposite side, as the first side becomes mechanically disadvantaged} and similar to the muscular drive of female hips, much revered by some. Apparently the motion may be tamed a little by ensuring there are restrictions to the sideways swing, which is provided by the flanges on the wheels, apparently absent on female hips. The standard solution is to check the distance between the wheel flanges {back to back} and adjust them to the recommended distances. There are several tools to measure this distance, accurately. The wheels will slide on their axle - with care - in or out to adjust.

{Note - there are also lots of expensive tools to space the wheels closer or further apart. Personally, I have seldom adjusted the back to backs, but there is lots of advice from people far more skilled than me, suggesting that gentle application of a toffee hammer and pointed punches are just as effective.}

Julian

 

[34C]

QUOTE (Julian2011 @ 23 May 2020, 22:10) <{POST_SNAPBACK}>.... The wheels will slide on their axle - with care - in or out to adjust...
Cautionary note! Unless this is a split chassis mechanism, in which case don't.

QUOTE (Julian2011 @ 23 May 2020, 22:10) <{POST_SNAPBACK}>... similar to the muscular drive of female hips, much revered by some...
You do know that's simply advertising, produced by a learned technique; and it may be switched on and off?

 

[Julian2011]

QUOTE (34C @ 24 May 2020, 09:19) <{POST_SNAPBACK}>Cautionary note! Unless this is a split chassis mechanism, in which case don't.

You do know that's simply advertising, produced by a learned technique; and it may be switched on and off?