Made a mistake referring to the East / West setup, your setup is correct.
I am in the East (as you are) and use a Western setup, here is a c/p if you are interested.
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[FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]A common error made by both new installers and old timers alike is in attaching the linear actuator arm. [/SIZE][/FONT][FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]East of the Mississippi we use a Linear West setting. This seems counter-intuitive at first but closer examination will reveal the sense of this set-up. We want the actuator arm to push the dish into position and let gravity help to return it. From the eastern[/SIZE][/FONT]
[SIZE=-1][FONT=Verdana, Arial, Helvetica, sans-serif]part of the country the lowest satellites will be on the western side of the arc so we position the actuator arm on the west side of the dish (on the right when looking at the dish from behind). From the western part of the country the situation is reversed and the lowest satellites will be the eastern birds. West of the Mississippi we attach the actuator arm to the left of the dish and call it a linear east mount.[/FONT][/SIZE]
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[SIZE=-1][FONT=Verdana, Arial, Helvetica, sans-serif]I still think you should get more travel from a 24" arm. If you can, take the cover off the motor where the wires go in then drive to the east until it stops, check to see if the limit switch is engaged.[/FONT][/SIZE]