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/...
The 4610/4620 series operators are obsolete. There is no replacement part for any electronic component (motor/clutch, controller, input/output PC boards) for the obsolete 4610/4620 operators.Essent...
To check the clutch on a 4600 Series operator:
Follow the wires from the clutch to the 4 pin connector on the controller, and disconnect the connector from the control box.
Clutch -- Measure th...