A 4600 (4630/4640) not opening to a full 90 degrees could be caused by a couple things:
The Opening Force could be set too low. Try increasing the opening force adjustment on the controller a 1/4 turn clockwise. If the Opening Force adjustment is at max and the door will still not open completely, could be a defective closer or motor/clutch assembly.
The Closer Arm could be installed incorrectly (off one flat and preloaded to far). This can be verified by opening the door manually to 90° and hold it in the open position. Then turn on hold open switch. When motor stops turning, release door. If door falls back to less than 90° (approx 70°), arm is installed incorrectly. If the door holds open at 90°, then the arm was installed correctly, and it could be a defective closer or motor/clutch assembly.
A 4600 (4630/4640) motor continuing to run after door opened to a full 90 degrees could be caused by:
The opening force set to high. Turn unit off, and adjust opening force down slightly. Turn unit on and cycle. Repeat process until the motor stops running when door gets to 90°. If clutch continues to slip or door does not open completely, the motor/clutch will need to be replaced.
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