Open Circuit LRR025 LRR030 KRR038 KRR045 LRL025 LRL030 KRL038 KRL045 Hydraulic Sundstrand Sauer Pump

Sauer piston pump model:

LRR025, LRR030, KRR038, KRR045 & LRL025, LRL030, KRL038, KRL045, LRR025C, LRR030D, KRR038C, KRR045D & LRL025C, LRL030D, KRL038C, KRL045D.

Series 45 open circuit pumps can be applied with other products in a system to transfer and control hydraulic power.
Series 45 pumps provide an infi nitely variable fl ow rate between zero and maximum.Series 45 variable displacement pumps are compact, high power density units, using the axial piston concept in conjunction with a tiltable swashplate to vary the pump displacement. Series 45 pumps use a cradle swashplate design. A hydraulic control piston sets the swashplate angle. Control of the displacement piston is provided through a built-in pressure compensator valve. This valve will vary the swashplate angle from its maximum to its minimum position when the set pressure is reached. Controls are also available for remote compensating and load sensing systems. An available displacement limiter (frame G and H units only) allows adjustment of maximum fl ow to match system requirements. The Series 45 pump controls are designed for low hysteresis and responsive performance.

Details regarding the choice of hydraulic fluid

The correct choice of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in

a closed circuit the circuit 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 °C an operating temperature of 60 °C 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 circuit temperature. At no point in the system may the temperature be higher than 115 °C. If the above conditions cannot be maintained due to extreme operating parameters, please consult us.

Hydraulic fluid

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 variable pump A4VG is unsuitable for operation with HFA, HFB and HFC. If HFD or environmentally acceptable hydraulic fluids are being used, the limitations regarding technical data and seals mentioned in RE 90221 and RE 90223 must be observed. When ordering, please indicate the used hydraulic fluid.