We supply Sauer Axial Piston Variable Displacement Pumps series 90 of right rotation 90R030 90R042 90R075 90R100 90R130 90R180 90R250 and left rotation pump 90L030 90L042 90L075 90L100 90L130 90L180 90L250 Pump. 127-4589
Series 90 axial piston variable displacement pumps are of cradle swashplate design with variable displacement, and are intended for closed circuit applications.
Before starting project planning, please refer to our data sheets RE 90220 (mineral oil), RE 90221 (environmentally acceptable hydraulic fluids) and RE 90223 (HF hydraulic fluids) for detailed information regarding the choice of hydraulic fluid and application conditions. The correct choice of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in an open circuit the tank temperature. The hydraulic fluid should be chosen so that the operating viscosity in the operating temperature range is within the optimum range – the shaded area of the selection diagram. We recommended that the higher viscosity class be selected in each case. Example: At an ambient temperature of X degree F (X degree ) an operating temperature of 140 degree F (60 degree ) is set. In the optimum operating viscosity range (shaded area) this corresponds to the viscosity classes VG 46 or VG 68; to be selected: VG 68.
Please note: The case drain temperature, which is affected by pressure and speed, is always higher than the tank temperature. At no point in the system may the temperature be higher than 240 degree (115 degree ) for sizes 5 to 200 or 195 degree F (90 degree ) for sizes 250 to 500.
If the above conditions cannot be maintained due to extreme operating parameters, we recommend flushing the case at port U (size 250 to 500).
