17. GUIDES TO MAINTENANCE Avoid mixing oils: Never mix oils of different brands. If you have only oil which is a different brand from the one that is used in the machine, do not add it but replace all the oil. Bleeding air: After changing the oil, or replacing or cleaning the filter element or strainer, bleed the air from inside the circuit. If the oil in the hydraulic tank has been changed, or the element replaced, or the hydraulic cylinders or work equipment piping have been removed, run the engine at low idling after completion of the operation to bleed the air as follows. 1. Operate each cylinder 4 – 5 times to a point approx. 100 mm before the end of its stroke. 2.
Next, perate each cylinder to the end of its stroke 3 – 4 times. If, at first, the engine is run at high speed or the cylinder is operated to the end of its stroke, the air inside the cylinder may cause damage to the piston packing or other parts. Precautions when opening and closing engine side cover: When standing on the track to open the engine side cover, adopt a standing position, hold the side cover with both thumbs, and open it slowly with your other fingers. When the engine side cover is open, do not open or close the cab. Before opening or closing the cab, always close the engine side cover first. CORRECT INCORRECT 3-4