What was found
DURING A GROUND RUN, HYDRAULICS WOULD NOT COME ON LINE. DURING TROUBLESHOOTING, FOUND THE SPLINES ON HYDRAULIC PUMP WERE WORN. HYDRAULIC PUMP AND MAIN ROTOR TACH GENERATOR WERE REPLACED. THE PUMP IS MOUNTED ON THE TACH GENERATOR AND DRIVEN BY SAME. THE SPLINES ON THE TACH GENERATOR WERE WORN ALSO.