What was found
ON LANDING RNWY 4R, HAD EXCESSIVE SHIMMY & VIBRATION AT NOSE WHEEL TOUCHDOWN, FOLLOWED BY LEVEL 2 ALERT, HYD 1 FAIL, & 0 QTY INDICATED IN HYD SYS. BARELY ABLE TO CLEAR ACTIVE RNWY, HAD TO GET TOWED IN. KEPT ALL ENGS RUNNING FOR APPROX 20 MINS WITH QTY READING ZERO ON NR 1 HYD. R & R NLG STEERING ACTUATOR.