What was found
DURING FLIGHT AT FL240 WE FELT A STRONG VIBRATION, FOLLOWED BY A AMBER L HYD TEMP HIGH AND SHORTLY AFTER CYAN L HYD ENG PUMP FAIL. HYD SYS INDICATED 0% AND 109°. AN EMERGENCY GEAR EXTENSION WAS PERFORMED & ACFT WAS PINNED & TOWED TO RAMP. LARGE PUDDLES OF HYD FLUID WERE PRESENT ON THE TAXI WAY & RAMP. POWERED ON ACFT TO SEE LT HYD PUMP IS AT 0%.0PENED LOWER ENGINE COWL & PERFORMED GENERAL VISUAL INSP ON ENG. SAW HYD FLUID LEAKING ON HYD PUMP. CLEANED HYD FLUID WITH ALCOHOL. SERVICED LT HYD SYS & VERIFIED FUILD LEAKING OUT OF HYD PUMP CASE SPLIT, R & R HYD PUMP IAW AMM 29-12-01. BLED LT HYD PUMP IAW AMM 29-10-00, RAN ENGINES, TAXIED ACFT, DEPERATED FLAPS & SPOILERS. OPS CHKD GOOD.