Dor-O-Matic 4270903177

A: Yes - about 1997 the Dor-o-matic 990 Panic Device has been replaced by the 1990 Dor-o-matic Panic Device when Ingersoll Rand purchased Dor-o-matic they discontinued the 990. They used to have the Dor-o-matic 990 and the 1990, were the 990 was made with cast bronze and stainless steel housings and crossbars and the 1990 has cast aluminum housings and crossbars. These two exit devices are interchangeable. The internal parts are the same, and you can easily convert the surface hardware to the 1990 hardware.

In my experience if you are having difficulty with smooth operation of the unit via the key on the exterior the most common piece to replace would be the Dor-O-Matic 4270903177 1900 Pinion Cam.

A: The Part numbers are:

4270903177 for 1 each as seen here:

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CAM.102 for a package of 10 as seen here:

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A: A packing nut is the threaded part that holds the pinion in place.

A: Is the spring you're looking for located within an exterior handle on your exit device?

A: Please reply to this email with a photograph of that exterior trim - I will review and advise