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Disconnect the air supply from the machine.
Remove the solenoid cover on the left side of the ATC.
Remove lines 1 and 2 as shown in the following image. Then, place line 1 where line 2 previously was.
The know to the left side of the brass pressure regulator (1 in the above image) may need to be closed to allow pressure to build.
Press the silver manual actuation button (3 as shown in the following image) on the Power Drawbar solenoid. This should fire your power drawbar.
Reconnect the air supply to the machine.