Variable Displacement Pump A4VG - Group VH A/S

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4/52 Bosch Rexroth AG | Mobile Hydraulics A4VG | RE 92 003/05.03Technical DataFluidBefore starting a project, get detailed information about theselection of pressure fluids and application conditions from ourcatalog sheets RE 90220 (mineral oil), RE 90221(environmentally acceptable hydraulic fluids) and RE 90223(fire resistant hydraulic fluids, HF).The A4VG variable displacement pump is not suitable foroperation with HFA, HFB and HFC fluids. When operating withHFD or environmentally acceptable hydraulic fluids, obey therestrictions in the technical data and seal selection – pleasecontact us. The hydraulic fluid used should be stated in cleartext in the order.Operating viscosity rangeIn order to obtain optimum efficiency and service life, select theoperating viscosity (at operating temperature) from within therangeν opt = operating viscosity 16...36 mm 2 /sdepending on the circuit temperature (closed circuit).Viscosity limitsThe limiting values for viscosity are as follows:ν min = 5 mm 2 /sshort term (t < 3 min)at a max. permissible temp. of t max = +115°C.Ensure that the max. fluid temperature is also not exceeded inany pump space (for instance bearing area).ν max = 1600 mm 2 /sshort term (t < 3min)on cold start (p ≤ 30 bar, n ≤ 1000 rpm, t min = -40°C).At temperatures of -25°C down to -40°C special measures arerequired. Please contact us for further information.For detailed information on use at low temperatures, seeRE 90300-03-B.Notes on the selection of the hydraulic fluidIn order to select the correct fluid, it is necessary to know theoperating temperature in the circuit (closed circuit) in relationto the ambient temperature.The hydraulic fluid should be selected so that within theoperating temperature range, the operating viscosity lies withinthe optimum range (ν opt ) (see shaded section of belowselection diagram). We recommend to chose the higherpossible viscosity range.Example:At a circuit temperature of 60°C, the recommended operatingviscosity range is VG 46 or VG 68 (ν opt ; shaded area in belowselection diagram). VG 68 should then be selected.Important: The leakage oil (case drain oil) temperature isinfluenced by pressure and pump speed and is always higherthan the circuit temperature. However, the temperature mustnot exceed 115°C at no point in the circuit.If it is not possible to comply with the above conditionsbecause of extreme operating parameters or high ambienttemperatures please consult us.Selection diagramviscosity ν in mm 2 /s2500-40° -20° 0° 20° 40° 60° 80° 100°1600100060040020010060402010VG 22VG 32VG 68VG 46VG 10016003616ν opt.55-40° -25° -10° 0° 10° 30° 50° 70° 90° 115°temperature t in °Ct min = -40°C fluid temperature ranget max = +115°C
RE 92 003/05.03 | A4VG Mobile Hydraulics | Bosch Rexroth AG 5/52Technical DataFiltrationThe finer the filtration the better the achieved purity grade ofthe pressure fluid and the longer the life of the axial piston unit.To ensure safe operation of the axial piston unit, a minumumpurity grade of20/18/15 to ISO 4406 is necessary.At very high temperatures of the hydraulic fluid (90°C to max.115°C) at least purity grade19/17/14 to ISO 4406 is necessary.If above mentioned grades cannot be maintained pleaseconsult us.Temperature range of the radial shaft sealThe FKM shaft seal is admissible for a housing temperaturerange from -25°C to +115°C.Note:For applications below -25°C a NBR shaft seal is necessary(admissible temperature range -40°C to +90°C).When ordering, please state in clear text: with NBR shaft sealOperating pressure rangeInletVariable pump (with external supply, E):for control devices EP, EZ, HW and HD1boost pressure (when n = 2000 rpm) p Sp _________________20 barfor control devices DA, DGboost pressure (when n = 2000 rpm) p Sp _________________25 barAuxiliary pump:suction pressure p s min (ν ≤ 30 mm 2 /s) ____ ≥ 0,8 bar absolutefor cold start__________________________ ≥ 0,5 bar absoluteCase drain pressureThe lower the speed and the case drain pressure the higherthe life expectation of the shaft seal ring. The values shown inthe diagram are permissible loads of the seal ring and shall notbe exceeded.Stationary pressure loads in the range of the max. admissibleleakage pressure may cause a reduction of the life experienceof the seal ring will result.For a short period (t < 5 min) pressure loads up to 6 barindependent from rotational speeds are permissible.perm. pressure p abs. max.in bar6543211000size 125 sizes 40,56size 180 sizes 71,90 size 28size90size71size562000 3000 4000 5000speed n in rpmsize 28size 40OutletVariable pump:Pressure at port A or Bnominal pressure p N _________________________________________ 400 barpeak pressure p max __________________________________________ 450 barsummation pressure p max ___________________________________ 700 bar(pressure A + pressure B)Auxiliary pump:peak pressure p H max __________________________________________ 40 bar(pressure data according to DIN 24312)
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Variable Displacement Pump A4VG - Group VH A/S

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