Genie GCL-MJ&MH Manual 

Also see for GCL-MH: Product guide Manual Wiring diagram

4.5For Hollow Counterbalance Door Shaft:1) Use non-threaded hole in door shaft sprocket as a guide anddrill a 3/8" diameter hole through one side of the door shaft.Fig. 6A.2) Insert clevis pin through sprocket and shaft to hold sprocketin position.3) Drill through opposite side of shaft to obtain proper holealignment. Fig. 6B.4) Insert clevis pin through both holes and secure with cotter pin.Fig. 6C.For Solid Counterbalance Door Shaft:1) Insert key into door shaft keyway.2) Slide sprocket into place and secure with set screws.To Complete the Installation:If needed, realign operator sprocket with door sprocket. If you haveexcessive door shaft movement, an optional chain tension plate isavailable. Fig. 7A & 7B, pg 4.6.Chain CoupleILFigure 6AFigure 6BFigure 6Cwww.geniecompany.com 08-12Medium Duty OperatorGCL-MJ&MH