Description

YUKEN A Series Variable Displacement Piston Pumps

Piston Pumps A Series

♦ Hydraulic Fluids:-Use petroleum-based oils such as anti-wear type hydraulic oils equivalent to ISO VG-32 or 46. The recommended viscosity range is from 20 to 400 mm2/s and the temperature range is from 0 to 60℃, both of which have to be satisfied for the use of the above hydraulic oils.

♦ Control of Contamination:- Due caution must be paid to maintaining control over contamination of the operating oil which can otherwise lead to breakdowns and shorten the life of the unit. Please maintain the degree of contamination within the NAS Grade 10. The suction port must be equipped with at least 100 μm 150 mesh) reservoir type filter and the return line must have a line-type filter of under 10 μm.

Instructions-

♦ Mounting:- When installing the pump the filling port should be positioned upwards.

♦ Alignment of Shaft:-Employ a flexible coupling whenever possible, and avoid any stress from bending or thrust. Maximum permissible misalignment is less than 0.1 mm TIR and maximum permissible misangular is less than 0.2°.

♦ Suction Pressure:-Permissible suction pressure at the inlet port of the pump is between -16.7 and +50 kPa.For piping to the suction port, use the pipes of the same diameter as that of the specified pipe flange to be used. Make sure that the height of the pump suction port is within one meter from the oil level in the reservoir.

♦ Hints on Piping:- 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.

♦ Suction Piping :-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.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 userubbeuse Uberr hoses.

♦ Drain Piping:-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 0.1 MPa and surge pressure of less than 0.5 MPa. The length of piping should be less than 1 m, and the pipe end should be submerged in oil.

[Recommended Drain Piping Size]

♦ Bleeding Air:-It may be necessary to bleed air from pump case and outlet line to remove causes of vibration. An air bleed valve

(Model Number ST1004-*-10*, Page 265)  is recommended for this purpose.

More Information-PDF