EMPLOYEE WAS WORKING ON A BLOWN HYDRAULIC HOSE, FROM A L-1400 LOADER. IN ORDER TO REPAIR THE HYDRAULIC LINE, IT WAS NECESSARY TO UNDO THE HARD LINE, THIS CAUSED OIL TO DRIP IN AREA THAT HE WAS WORKING. WHEN HE TRIED TO TIGHTEN A BOLT THE WRENCH SLIPPED OFF BOLT, HITTING HIM IN LOWER LIP, THIS CAUSED PPROX 3 CM LACERATION TO HIS LOWER LIP.