The nylon washer has me baffled. What purpose could it possibly serve? With or without it it’s going to go to ground..
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Perhaps a more conformable seat in the harder material of the brush plate, holding the screw centered without damage to or from its threads.
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That does not look unlike my “new” 8111 switcher’s interior. All that I know is that without that washer in there, the locomotive tried to run forwards and backwards at the same time.
my Inclination is that there is some sort of ‘mistake’ in how the drawing illustrates the assembly. I believe the purpose of the washer is actually to isolate the screw from the solder lug. I have an MPC era NW2, the DT&I 8111 that @Engine_1988 has, and it uses such a configuration. It is used, irrc, as a lug to which one of the wires from a 2-position E-Unit or a manual reverse switch is connected. Also connected to the lug is one of the two windings from the dual-wound motor field.
Anyhow, that’s my take on it.
-El
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Easy to tell: is the hole in the solder lug large enough to take the shank of the nylon washer?
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I think so–next time that I’m in the train room I’ll get some pictures of it.
Edit: nevermind.
Ding-ding-ding… We have a winner!
Yes, the drawing is incorrect. The shoulder washer is between the screw and lug, not lug and brushplate, and for the reasons El mentioned. El, looks like our discussion in the thread about the bell ringing switcher, huh? Looks like they occasionally spelled “accuracy” with a ‘k’ or two.
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