Employee was checking a pump that was being lifted out of water and when he reached out to lift one end up to inspect he felt pain in lower back. (EE HAS BEEN WORKING SINCE DATE OF ACCIDENT THAT OCCURRED AT JWR #4 MINE ID 0101247 AND HAS BEEN TREATED STEADLY FOR THE INJURY. EE IS CURRENTLY AT JWR #7 MINE ID 0101401 AND DID NOT START LOSING TIME UNTIL 12/17/15 DUE TO SURGERY).