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I have an Atlas GP9 from a few years back.  One of the cooling fans on the top has fallen into the body area.  I'm sure it will eventually short something out.

 

I have taken apart a dummy GP9 but can't figure out how to get to the four screws that hold on the body shell.  I assume you have to remove the trucks to access the screws but can't get the motor to separate from the truck.  I removed the one easy screw that holds the motor.

 

So what's the trick?

Last edited by marker
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Just shake it continuously until it falls out :-)

I tried that, then I started thinking about all the places it could wind up.  After reading the thread Calvin suggested, I could pull the cab shaking it should let it come out there. When you look at the cooling fan housing with the missing fan you can see the motor flywheel.  When it spins it catches your eye, so I need to reinstall it.  I also noticed that the front headlight doesn't work, so that needs to be addressed.

 

I also would like to be able to separate the truck from the motor.  Looking at a parts diagram, I don't know why it isn't separating.

 

I had the windows fall out of an Atlas GP-9 when I got it, and called them to ask if I could get the cab off without taking off the shell (I wanted to be sure before I broke something!), and they confirmed it was removable. It still wasn't the easiest thing, wrestling with something fairly delicate like that in fear of breaking off a piece of plastic somewhere, but I finally got it to release and was able to pull it up and off. You might be able to gain access to your fan piece that way, through the rear of the cab area. (By the way, if you have questions, call them at their service dept. - they were very nice to talk to.)

 

Also, if I remember - without looking at the engine (check your instruction manual) - I believe the top of the shell has a hatch that's removable to get to the battery, etc. - just snaps on and off. I think this access hatch was back just aft of the fans, and you might be able to find your missing fan inside by removing that hatch, without having to remove the shell.

Last edited by breezinup
The cooling fan is a three part assembly that is install from the outside. You may be able to get all the pieces without removing the shell.  The dynamic brake can be removed with the shell assembled.

Shell to frame is (four) screws.
Here is the Atlas exploded diagrams from their website. Click on the underlined phrase to link.
Shell/body
Frame
Truck
You may be able to remove the truck side frames for better access to the frame to shell screws.
Last edited by Mike CT

Howard, i just went through this a few months ago to repair a coupler. Once you get the sideframes off you will be able to see the screws and removing the body is relatively easy. As for the motor from the truck I don't think I had to do that as I didn't have to replace the coupler, only repair the broken wire.

 

Pete

Thanks to all that contributed.  That's what is best about the Forum.

 

I'm actually working on two engines.  A dummy and a powered unit.  The dummy came apart fine.  

 

The powered unit is the one with the fan issue.  I got the cab off but can't access the side frame screws.  BTW - A great tool for pulling the railing from the body, etc. is the track spiking pliers from Micro Mark. 

 

I was just messin with ya anyway.

Laidoff - I caught that, and the shaking in my reply was a back atcha.  However, after I removed the cab I did try to see if the parts might tumble out.  No luck.

 

Mike - I've always admired the work you've done.

 

breezinup - I kind of remember something like that, but like you say, "if I remember". 

I just checked my Atlas O GP-9 (CB&Q version), and yes, there is a large hatch at the top of the shell, which is the access point for the battery. I'm sure this was mentioned in the instructions. The hatch (actually, a snap-off piece) is large, exposing most of the interior area between the front pair of fans and the rear pair. Hopefully you can access your fan with this access.

Last edited by breezinup

Thanks breezinup, I think that will work.

 

Atlas GP9/7 Engineering Change :  I emailed Norton to ask how he got the screws out of the truck side frames.  I couldn't access them except in the way Calvin suggested.  It turns out the Atlas modified the trucks.  My Atlas GP9 is an early model.  The GP7's I have are later models.  Atlas modified the trucks so that the screws holding the side frames go in from the bottom.  The earlier trucks went in from the top.  I guess even the guys doing repairs were having problems.

 

As calsz06 posted - The trick is finding a screw driver with a shaft that will clear the gaps necessary to get to the four body screws.   

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