BLEEDING AIR FROM CIRCUIT BLEEDING AIR FROM PISTON PUMP * The case drain hoses (x 3) for each pump are connected to block (3). but loosen only the connector of case drain hose (2) connected to the top of the block. There is no need to loosen the connectors of the other two case drain hoses. Turn knob (4) of the hydraulic tank pressurizing valve to the left, and adjust so that the gauge indicator reads approx. 0.01 kg/cm2. A If the pressure of the pressuriz- 3. When changing the oil in the hy- draulic tank, or removing the piston pump, or removing the piping of the piston pump, bleed the air from the piston pump in the following way after assembling.
* Before bleeding the air from the piston pump, check that the hy- draulic oil in the hydraulic tank is filled to the specified level. Loosen plug (1) on top of the tube at the suction side of the piston pump. There is one plug for each pump, so loosen all plugs (3 places). Loosen the connector at block (3) side of case drain hose (2) of the piston pump. ing valve is too high, oil may spurt out from plug (1) and hose (21, so adjust the pressure carefully. 4. Turn valve (5) to the right to open it, and pressurize the oil inside the hydraulic tank. ww-02055 -71 -