Description

Hydraulic Fluids ■ Hydraulic Fluids. Use petroleum base oils such as anti-wear type hydraulic oils or R & O (Rust and oxidation inhibitor) type hydraulic oils (ISO VG 32 or 46) with a viscosity range of 20 to 400 cSt at temperature of 0-600C both to be satisfied. ■ Control of contamination. ■ Mounting. ■ Alignment of Shaft. ■ Suction Pressure. ■ Hints on Piping. ■ Suction Piping. ■ Drain Piping. [Volume of Pre-Fill Oil Required] ■ Recommended Drain Piping Size. Model Number Fitting Size Inside Dia. of Pipe A3H16, A3H37 1/2” (Inside dia. 12 mm or more) 12 mm or more A3H56, A3H71, A3H100, A3H145, A3H180 3/4” (Inside dia. 16 mm or more) 19 mm or more ■ Safety valve ■ Bleeding Air. ■ Starting. Model Number Volume cm3 A3H16 400 A3H37 700 A3H56 900 A3H71 1300 A3H100 1700 A3H145 2400 A3H180 3200 PISTON PUMPS Much care should be taken to maintain control over contamination of the operating oil which can otherwise lead to breakdown and shorten the life of the unit. Please maintain the degree of contamination within NAS Grade 10. The suction port must be equipped with at least a 100 µm (150 mesh) reservoir type filter and the return line must have a line type filter of under 10 µm. When installing the pump the filling port should be positioned upwards. Employ a flexible coupling whenever possible, and avoid any stress from bending or thrust. Maximum permissible misalignment is less than 0.1mm TIR and maximum permissible misangularity is less than 0.20 . Permissible suction pressure at suction port of the pump is between -0.16 and +0.5 Kgf/cm2 (-127 mm Hg~+0.5 Kgf/cm2 ). In case of the speedis over 1800 r/min., adjust the pressure 0 to +0.5 Kgf/cm². For piping to the suction port, use pipes of the same diameter as that of the specified pipe flange. Make sure that the height of the pump suction port is within one meter from the oil level in the reservoir. When using steel pipes for the suction or discharge ports, excessive load from the piping to the pump generates excessive noise. Whenever there is fear of excessive load, please use rubber hoses. In case the pump is installed above the oil level, the suction piping and suction line filter should be located lower than the pump position to prevent air in the suction line. Install drain piping according to the chart and ensure that pressure within the pump housing should be maintained at a normal Pressure of less than 1 Kgf/cm2 and surge pressure of less than 5 Kgf/cm2 . Length of piping should be less than 1m, and the pipe end should be submerged in oil. When delivery line is blocked suddenly, surge pressure is occurred so a relief valve should be set in the circuit to eliminate any damage on equipment and piping. Case for A3H37 under the condition of pressure 350 Kgf/cm2 and shaft speed 1800 r/min, the volumetric efficiency is 95% (or above) and the overall efficiency is 90% (or above).