What was found
WHILE ACCELERATING THROUGH 50 KTS DURING TAKEOFF ROLL, EXPERIENCED AN EXTREME NOSE WHEEL SHIMMY, WHICH CAUSED THE AIRCRAFT TO SHAKE AND VIBRATE HARSALLY, TAKEOFF WAS ABORTED.REMOVED LT NOSE WHEEL P/N 3-1538-1; S/N 0513/0513 AND INSTALLED OVH P/N 3-1538-1; S/N 0428/0428 ON LT AXLE. REMOVED RT NOSE WHEEL P/N 3-1538-1, S/N 1028/1028 AND INSTALLED OVH P/N 3-1538-1 S/N 0514/0514 ON RT AXLE. INFLATED NOSE TIRES TO 140 PSI. WORK DONE IAW CESSNA CITATION 750AMM SECTION 32-41-01. LEAK CHECK SATISFACTORY.