B767-300 FLT CREW HAS A TRACK AND OR HDG DEV DEPARTING LEBL.

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DURING PREFLT; WE WERE CONFRONTED WITH SEVERAL ISSUES; FIRST OF WHICH WAS A HYD PUMP (ADP) THAT WAS INOP AND ON MEL. THIS RESTR OUR RWY ALLOWABLE TKOF WT AND SLOWED OUR GEAR RETRACTION TIME APPRECIABLY. IN ADDITION; FLT CTL SENT US 2 FLT PLAN UPDATES REVISING OUR BLOCK FUEL. SINCE WE WERE TOO HVY TO DEPART FROM THE USUAL RWY (25L); WE WERE TOLD WE WOULD USE RWY 25R AND A DIFFERENT DEP PROC. BUT; JUST PRIOR TO TKOF; LEBL TWR AGAIN REVISED OUR DEP TO CLB TO 4000 FT MSL AND TRACK THE LEBL 247 DEG RADIAL. I; AS CAPT AND MONITORING PLT; ENTERED THE LEBL FREQ AND 247 DEG RADIAL TO USE AS A BACKUP TO LNAV. THE FO; AS THE PF; INCORRECTLY PROGRAMMED THE 240 DEG RADIAL IN THE FMS. SUBSEQUENTLY; AFTER TKOF WITH LNAV CAPTURED; THE FO MOMENTARILY FLEW THE FMS GUIDANCE (IE; THE 240 DEG RADIAL) INSTEAD OF THE REQUIRED 247 DEG RADIAL. BECAUSE I WAS TALKING TO DEP AND MONITORING THE GEAR RETRACTION; I DIDN'T NOTICE WE WERE OFF COURSE SLIGHTLY TO THE S UNTIL ABOUT 2 NM OUT. WHEN NOTICED; I USED HDG SELECT AND WE QUICKLY RETURNED TO THE CORRECT COURSE. LESSON RELEARNED: THE MONITORING PLT SHOULD ALWAYS BACK UP ALL FMS ENTRIES.