EMPLOYEE WAS CLEANING MUD OUT OF EXCAVATOR TRACKS WITH SPADE SHOVEL WHEN POKING HIT METAL & STRAINED HIS RT. SHOULDER. EE REPORTED THE ACCIDENT HAPPENED ON 2/25/04, HE REPORTED THE INCIDENT ON 3/5/04. EE CONTINUED HIS REG.DUTY W/ RT. ARM RESTRICTIONS UNDER DR.'S CARE. DUE TO SURGERY EE BECAME A LOST TIME AS OF 3/25/04.