EMPLOYEE REPORTED: HE UNBOARDED RAM CAR OPERATOR'S COMPARTMENT & WAS ATTEMPTING TO PULL 2"" CONT MINER WATER HOSE OUT OF THE HAULAGE ROAD. WHEN PULLING ON THE HOSE A ""TWINGE WAS FELT TO HIS LOW BACK"". THE FOLLOWING MORNING BACK WAS STIFF & SORE. CAME TO WORK ON 4-30-04, REPORTED THE INJURY TO MINE MGT. STATED PAIN & DISCOMFORT HAD WORSENED, LEFT TO SEEK MEDICAL ATTENTION.