A B727-200 INCURRED DAMAGE TO THE NOSE LNDG GEAR DOORS ACTUATING RODS AND RETRACT MECHANISM WHEN ATTEMPTING TO PUSH BACK WITH THE PARKING BRAKE SET.

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WAITING FOR THE LOAD CLOSEOUT. WE WERE WT RESTR. THE ENGS WERE RUNNING TO BURN FUEL FOR POSSIBLE OVERWT SIT IN ORDER TO AVOID ANY ADDITIONAL DELAY. I CONTINUED TO UPDATE OUR FUEL WT WITH DISPATCH WHO; IN TURN; NOTIFIED LOAD. AFTER SEVERAL MINS THE RAMP SUPVR CAME BY TO CHK WHY WE WERE STILL AT THE GATE. WE RELAYED OUR COM TO THE RAMP SUPVR THROUGH THE GUIDEMAN ON THE INTERPHONE. I EXPLAINED OUR SIT TO HER. AFTER TALKING ON HER RADIO; THE RAMP SUPVR INFORMED ME THE WTS WERE WITHIN LIMITS AND THAT IT WOULD BE OK TO PUSH BACK. AFTER THE FO CALLED RAMP; AND BEFORE WE STARTED THE PUSHBACK; WE RECEIVED AN ACARS MESSAGE ALERTING US NOT TO PUSH BACK DUE TO OUR WT AND REQUESTED ANOTHER CHILD COUNT. I STOPPED THE PUSHBACK AND THE FE WORKED WITH THE PURSER TO OBTAIN ANOTHER CHILD COUNT. THEN I CALLED DISPATCH TO CHK ON OUR WT AND CONFIRM THE REDUCTION IN FUEL. DISPATCH ADVISED ME THE WTS WERE WITHIN LIMITS AND THE NUMBERS WERE IN ACARS. ONCE AGAIN; THE FO CALLED FOR PUSHBACK. WE WERE CLRED TO PUSH TAIL BTWN XX AND XY. THE GUIDEMAN REFUSED THE CLRNC BECAUSE THE ENGS WERE RUNNING. WE WERE THEN RECLRED TO PUSH TO SPOT Z; AS REQUESTED BY THE GUIDEMAN. I RELAYED THE NEW CLRNC TO THE GUIDEMAN. MOMENTS LATER; I HEARD A LOUD POP. THE GUIDEMAN ASKED IF THE BRAKES WERE RELEASED. I LOOKED DOWN AND SAW THAT THE BRAKES HAD BEEN RESET. I DON'T RECALL WHEN I RESET THE BRAKES; BUT OBVIOUSLY DID SO DURING THE PRECEDING SEQUENCE OF EVENTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B727-200 AND PUSHBACK STARTED WITHOUT THE NORMAL CHALLENGE AND RESPONSE 'BRAKES OFF; HYD PRESSURE IN BYPASS; ETC.' THE RPTR SAID A LOT OF CONFUSION WAS PRESENT ABOUT THE WT LIMITS AND THE PUSHBACK WAS HALTED TWICE. THE RPTR STATED THE DAMAGE WAS TO THE NOSE GEAR DOORS ACTUATING RODS AND RETRACT MECHANISM. THE RPTR SAID THE ACFT WAS REMOVED FROM SVC FOR MAINT. THE RPTR STATED THE TOWBAR SHEAR BOLT DID NOT SHEAR NOR DID THE NOSE GEAR TOW LUG BOLT SHEAR WHICH WOULD HAVE LIMITED THE DAMAGE. CALLBACK CONVERSATION WITH RPTR FROM ACN 398189 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS REMOVED FROM SVC BUT DID NOT HAVE ANY INFO ON THE EXTENT OF THE NOSE GEAR DAMAGE. THE RPTR SAID THE PUSHBACK OP; WITH ALL THE STOPS AND STARTS; WAS CONFUSING AND IRREGULAR.