MACHINE OPERATIONS AND CONTROLS OPERATION Hydraulic Oil Level - Check/Add 0. The parts and oil are at high temperature after the engine is stopped, and may cause burns.Wait for the temperature to go down before starting the work. When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it. 1. If the work equipment is not in the condition shown in the diagram on the right, start the engine, run the engine at low speed, retract the arm and bucket cylinder rods fully, then lower the boom, set the bucket teeth in contact with the ground, and stop the engine. 2. Confirm that the oil level is between the H and L marks of sight gauge (G).
NOTICE Do not add oil above the H line. This will damage the hydraulic circuit or cause the oil to spurt out. If oil has been filled exceeding the H level, swing the upper structure until drain plug (P) beneath the hydraulic tank comes between the right and left track shoes and stop the engine. Wait for the oil to cool down sufficiently, then remove cover (1) and drain the excess oil through drain plug (P). 3. If it is below the L level, open the mud cover and add through filler port (F). REMARK The oil level will vary depending upon the oil temperature. Accordingly, use the following as the guide: Before operation: around L level (Oil temperature 10 to 30єC (50 to 86єF)) Normal operation:
around H level (Oil temperature 50 to 80єC (122 to 176єF)) 4. Extend the boom, arm, and bucket cylinder fully as shown in the diagram on the right, remove the oil filler cap, then install the cap and pressurize the inside of the tank. NOTICE Be sure to pressurize the hydraulic tank. If it is not pres- surized, the pump will suck in air, and this will adversely affect the equipment. 3-36 WARNING