This is an older model. The motor needs lubrication but I can't find a way to get the body off the chassis. I was able to get the belly pan off underneath but there is a cylindrical weight in there that seems to be permanently attached.
I was going to upload a photo but I got a message that the upload folder is full.
Is this a pancake motor style? One truck is powered only or 2 truck powered?
pancake motor:https://hoseeker.net/assemblyexplosionbachmann/bachmannemdgp40diagram1990.jpg
If so there are 2 pins on each side of the frame that go into holes in the shell. You need to spread the shell at these locations to get it off.
If 2 power trucks https://hoseeker.net/assemblyexplosionbachmann/bachmannemdgp40pg02.jpg
there is a tab on each side of the fuel tank. Spread shell apart there to get it off.
how to post photos https://www.bachmanntrains.com/home-usa/board/index.php/topic,33824.0.html
Thanks. That was so helpful. It is a single drive pancake motor with tabs on either side of the fuel tank. However, now that I have opened it up, I made a rookie mistake and didn't take a picture of the motor and wiring. While handling the motor, 2 red wires broke loose from where they belong. The explosion diagram only shows 2 leads coming from the printed circuit board. In my photos below, I am trying to remember what Wire #1 and Wire #3 connect to.
https://www.flickr.com/gp/187627757@N07/Zxt910
Look at where wire 2 and 4 go to. Do both go to the top pad on the motor? If so wire 1 and 3 go to the other top pad on motor.
I added another picture for you to see.
Wire #2 goes from the strip on the printed circuit board to the brush on the left. Wire #4 is a jumper that goes from the contact on the wheel to the right hand brush. I don't see a pad on top of the motor.
The only contacts near the top of the motor are the two brush contacts on the top/side that Wires #2 and #4 are connected to. Since there is no pad on the top of the motor, what are your other thoughts?
The two black wires should go to one of the brush tabs on top of the motor, the two red wires go to the other one. If there are pickups on the other truck, the red and black wires should be on the same side as the motor truck.
(https://live.staticflickr.com/65535/49705580498_c599d30369_b.jpg)
Len
Does the back truck have 2 black wires on it? Normally, the red wire is from 1 rail and the black from the other rail. Bachmann might have used red for front and black for rear( or other way around). Trace the black wire from the rear truck to the the board. Then from the front of the board to the motor tab. Solder the red wire from the board to the other motor tab. Solder the red wire from the wheel pick up to the other tab. This way you should have a red and black wire from the same side of the frame (rail) to a motor tab.
All of the Bachmann pancake motor locos I have use red for the pickups on one side, black for the other side. If you mix the blacks and reds you end up with a short.
Len
I believe my HO Plymouth was wired like that. By the way, it did run on DCC with a DZ125 decoder. It required about 3/4 amps.
Rich