BLEEDING AIR FROM CIRCUIT BLEEDING AIR FROM HYDRAULIC CIRCUIT 5. Continue until oil flows out from plug (I) (3 places) and the connector of hose (2). When the air has been completely bled, tighten plug (I) (3 places) and the connector of hose (2). 6. Close valve (5), and set the read- ing of the gauge of the pressuriz- ing valve to “0”. 7. Check the oil level and add oil if necessary. A If the air is not bled completely, the piston pump may be dam- aged, so always carry out the air bleeding operation correctly. After bleeding air from piston pump, bleed air from hydraulic circuit.
* If the engine is run at high speed at first, or if the cylinder is moved to the end of its stroke, the air in the cylinder may damage the piston pack- ing, etc. 4. After bleeding the air, tighten air bleeding plug (I 1. + Tightening torque of the plug After replacing oil, filter element or strainer, bleed the air from the circuit. To bleed the air from the hydrau- lic cylinders or hydraulic piping, run the engine at low idling and do as follows. (I): 1.15 20.15 kgm 1. Operate each hydraulic cylin- ders (of steering, bucket and lift arm) 4 to 5 times, stopping 100 mm from stroke end. 2.
Next, operate each cylinder 3 to 4 times to the end of its stroke, then stop the engine and loosen air bleeding plug (1) of the hydraulic tank to bleed the air. Increase the engine speed, and repeat step 2 to bleed the air until no more bubbles When pressurizing the tank, the tank cannot be pressurized if the oil filler cap of the hydraulic tank is not tightened. For details, contact your Komatsu distributor. 3. come out from plug (1). - 72 - w-04292