Author Topic: Kato SD40 (SP version)  (Read 1491 times)

Espeelark

  • Engineer
  • ***
  • Posts: 83
Kato SD40 (SP version)
« on: October 30, 2025, 05:01:23 PM »
Finish one install (SW1500), start another.....

Kato SD40's are noted for their smooth operation and this one is no different.
So here's an SD40 that I super-detailed and painted quite a handful of years ago:
RPUG SP7370 Three Qrtr View.jpg

I wish I took a picture of the "under the hood" factory arrangement before I gutted it, but, I didn't. Here's the bare chassis, motor and driveline after everything got stripped. Note the PC board in the foreground.
RPUG Chassis - Bare 01.jpg

I reduced the height of the two factory motor brackets on either side of the motor and use them to mount the PCB board which will serve as my base for the LM-3S and also allow me to connect wires (like the common blue) together. Also, I'm using a Scale Sound Systems speaker & enclosure which installs at teh back end of the chassis. I also placed an LM-3S module in place to get an idea of where it might go - as can be seen in this photo.
RPUG Chassis - Fit up 01.jpg

Watch this space for updates!
Espeelark (Paul Mac)
Modeling the SP in Ohio
"Bad is never good until worse happens...."

LVRR1856

  • Fireman
  • **
  • Posts: 33
Re: Kato SD40 (SP version)
« Reply #1 on: October 31, 2025, 08:55:14 PM »
Looking good so far EspeeLark - keep us posted with pictures.
I'm working on an Atlas C424 and a P2k GP18. Almost ready.

Espeelark

  • Engineer
  • ***
  • Posts: 83
Re: Kato SD40 (SP version)
« Reply #2 on: November 10, 2025, 02:32:51 PM »
Progress so far....
RPUG Chassis - Wiring.jpg

Here's everything pretty much roughly in place.
You can see the four (-4-) wiring harnesses for the lights: fwd headlight, rear headlight, fwd gyralight, rear gyralight.

The Scale Sound Systems speaker is mounted in the rear with a couple pieces of double-sided tape.
All of the other wiring is soldered to the PC Board which is screwed to the two OEM-posts which were used to mount the factory board.

Now I'll use some double-sided tape to mount the LM-3S to the top of the PC Board and start tucking the wires in place.
Espeelark (Paul Mac)
Modeling the SP in Ohio
"Bad is never good until worse happens...."