Atlas 2-8-8-2

[woodone]

Any one ever had one of these apart?
Doing DCC sound install and need to remove the driver assemblies.
I see where there are two pressed in pins over each driver set that holds what looks like a plastic insulator.
The pins are pressed into the metal chassis . They seem to be very tight, has they don’t move with finger pressure.
But I have not put any type of pressure on them yet.
I think that to move the pins I will need to make some kind of press.
Thanks in advance. 

[Point353]

Might this diagram be of some help?

[ncbqguy]

The 411018 Retaining Pins on the front and rear engines were a huge design flaw on these locomotives.
Most model articulateds use a single pin in a horizontal frame slot which allows lateral and vertical pivot of the front and rear engines.  This design has only a small amount of slop to accommodate any vertical movement...like going into a grade.   Oops!!
Charlie Vlk

[woodone]

Thanks Point 353, for the drawings- I did find that same one- thoes pins just looked tight.
ncbqguy- anyway to free then up a bit?

[peteski]

Thanks Point 353, for the drawings- I did find that same one- thoes pins just looked tight.
ncbqguy- anyway to free then up a bit?

Wow, that is a poor design!
The problem I see with providing additional play at the pin slots is that the worm-to-gear mesh will be compromised.  Normally in this type of design a single pivot pin is used, and that pin is also the axle for the worm gear.  That way the entire engine can swivel fore/aft and turn, but the worm gear mesh always stays in correct alignment.

[ncbqguy]

Not having one anymore I can’t say for sure, but one could create an oval slot centered on the top double gear shaft and replace it with single pin and remove the old pin restraints from the chassis that would convert it to a more conventional design. 
Charlie Vlk