24. SERVICE PROCEDURE 6. Add the specified amount of engine oil through oil filler port F . Check that the oil level is between H and L on the sight gauge. NOTICE For details of the oil to use, see “20. USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE”. NOTICE When the hydraulic breaker is installed, the hydraulic oil dete- riorates earlier than in normal bucket digging work. Therefore, replace the hydraulic oil according to the chart at the right. 7. After replacing hydraulic oil and cleaning or replacing filter element and strainer, bleed air from the circuit according to the following procedure. 3-76