A7VO28 Hydraulic Axial Piston Pump

Product Description

Variable axial piston pump A7VO with tapered piston rotary group in bent axis design for hydrostatic drives in open circuits

– For operation in mobile and industrial applications

– The flow is proportional to the drive speed and the displacement and steplessly variable from qv max to qv min = 0

– Wide range of controls and adjustment devices

– Compact, robust bearing system for long service life

– Available with Long Life bearings for special fluids and extreme service life requirements

– Pressure control is standard

– Optical or electric swivel angle indicator available

Technical Parameters

Table of values (theoretical values, without efficiency and tolerances; values rounded)

Feature

Hydraulic fluid

For extensive information on the selection of hydraulic fluids and application conditions please consult our data sheets RE 90220 (mineral oils), RE 90221 (ecologically acceptable fluids) and RE 90223 (HF-fluids).The variable pump A7VO is not suitable for operation on HFA fluids. When operating on HFD or ecologically acceptable fluids, limitations to the technical data and seals according to RE 90223 and RE 90221 must be observed.For the sizes 250 and 355 with operation on HFC-fluids, the A4VSO. F must be used. For certain selected HFC fluids the same pressures and speeds are permissible as for operation on mineral oil.

Notes on the selection of hydraulic fluids

In order to select the correct fluid, it is necessary to know the operating temperature in the tank (open circuit) in relation to the ambient temperature. The hydraulic fluid should be selected so that within the operating temperature range, the viscosity lies within the optimum range (νopt) see shaded section in the selection diagram. We recommend that the higher viscosity grade is selected in each case.

Example: at an ambient temperature of X° C the operating temperature in the tank is 60° C. In the optimum viscosity range (νopt ; shaded area), this corresponds to grades VG 46 or VG 68; select: VG 68.

Important: The case drain temperature is influenced by pressure and speed and is always higher than the tank temperature. However the max. Temperature at any point in the system may not exceed 90° C. If the above conditions cannot be met, due to extreme operating parameters we recommend a housing flushing via port U.

Dimensions

Company Profile