Remove shell of Atlas SW Swithcer 151-6143

I don't recognize that product number, so I don't know what model you have.  The Atlas switchers frequently have tabs that you need to unlatch under the cab in order to remove the shell.

John has definitely taken a few locos apart in his time.   However, if someone does have an exploded diagram that they can share, it would be a nice resource for future reference.

Thanks John, but I don't see any tabs that look like they would let the shell loose.  I do have the original manual and all it talks about is oiling the axles and pick-up rollers.  No  mention of the motor, lubing it, or a diagram to show how to remove the shell.  If a diagram is ever posted, it would be very helpful.  I have seen others say these shells are really hard to remove, dealers won't even do it, so for now, I will let the engine sit on a siding.

There are 4 screws. 2 at each end. It helps to take the side frames off to access them. There are 2 tabs at the front of the cab— mine broke off. No harm. Carefully wiggle the hood and cab up. They will come as one piece.

The squealing sound may be the flywheel rubbing against the heat sink. That is the trouble with this one. If you know how to fix the rub, let me know!

I try not to break those tabs off, but they do sometimes break anyway.

Thank you I will give it a try.