The EE was attempting to change a leaking hose on a CAT 988 Loader. The line was under the cab, so the employee was in an awkward position getting to the bolts. While trying to loosen the bolts, the EE felt a pain in abdomen. EE did not go to the doctor until 6/13/16, where the doctor diagnosed a hernia, placed EE on restrictions, thereby making the accident reportable.