What was found
UPON LOWERING THE LANDING GEAR WE RECEIVED "L HYD PRESS" FOLLOWED BY "L HYD QTY" EICAS MESSAGES. HYD QTY WAS "0.00" ALONG WITH HYD PRESS "0". WE HAD ASSOCIATED "L YAW DAMPER" AND "RUDDER RATIO" MESSAGES. PERFORMED A GO AROUND, LEFT GEAR DOWN AND FLAPS 20. RAN QRH, SELECTED L ENG AND LEFT ELEC HYD PUMPS OFF. UPON LANDING WE HAD NO NOSE WHEEL STEERING. EMERGENCY WAS DECLARED. WHEN A/C ARRIVED FOUND LT GEAR DOWNLOCK HYDRAULIC HOSE RUPTURED. REMOVED AND REPLACED RUPTURED HYD LINE AND ADJACENT FLEX HOSE DUE TO CHAFFED CONDITION IAW AMM 32-32-02-4 AND AMM 20-11-00-2. ADJUSTMENT/RIG NOT ACCOMPLISHED OF ANY LANDING GEAR COMPONENT RII NOT REQUIRED. WITH GEAR PINS INSTALLED CYCLED GEAR HANDLE SEVERAL TIMES NO LEAKS NOTED COCKPIT INDICATIONS NORMAL REF AMM 32-32-02-4. REF WRI 09-10/5397 FOR GEAR PINS. ***