Axial Piston Fixed Displacment Motor AA2FM (A2FM) - Group VH A/S

4/36 Bosch Rexroth Corp. AA2FM RA 91 001/07.05Technical DataHydraulic fluidSelection diagramBefore starting project planning, please refer to our datasheets RE 90220 (mineral oil), RE 90221 (environmentallyacceptable hydraulic fluids) and RE 90223 (HF hydraulicfluids) for detailed information regarding the choice of hydraulicfluids and conditions of use.The AA2FM fixed displacement motor is not suitable for usewith HFA. If HFB, HFC and HFD or environmentally acceptablehydraulic fluids are being used, the limitations regardingtechnical data and seals mentioned in RE 90221 andRE 90223 must be observed. When ordering please indicatehydraulic fluid used.viscosity ν SUS (mm2/s)7000500030002000100050030020015010080706050(1600)(1000)(600)(400)(200)(100)(60)(40)(20)(10)(-40°) (-20°)(0°) (20°) (40°) (60°) (80°) (100°)VG 22VG 32VG 68VG 46VG 1007400(1600)170 (36)νopt.80 (16)Viscosity rangeWe recommend that a viscosity (at operating temperature) foroptimum efficiency and service life purposes ofν opt = optimum viscosity 80...170 SUS (16...36 mm 2 /s)selected, taken into consideration the circulation temperature(closed circuit) and tank temperature (open circuits).Limits of viscosity rangeThe following values apply in extreme cases:Sizes 5...200:ν min = 42 SUS (5 mm 2 /s)short term (t < 3 min) at max. permitted temperature oft max = +240°F (+115°C).ν max = 7400 SUS (1600 mm 2 /s),short term (t < 3 min) with cold start (p ≤ 435 psi / 30 bar,n ≤ 1000 rpm, t min = -40°F / -40°C).Sizes 250...1000:ν min = 60 SUS (10 mm 2 /s),short term (t < 3 min) at max. permitted temperature oft max = +195°F (+90°C)ν max = 4600 SUS (1000 mm2/s),short term (t < 3 min) with cold start (p ≤ 435 psi / 30 bar,n ≤ 1000 rpm, t min = -13°F / -25°C).Note that the maximum hydraulic fluid temperature must not beexceeded locally either (e.g. bearing area). The temperature inthe bearing area is - depending on pressure and speed - up to22 °F (12 K) higher than the average case drain temperature.Special measures are necessary at temperatures between-40°F and -13°F (-40°C and -25°C). Please contact us.See RE 90300-03-B for detailed information about operationat low temperatures.40(5)42 (5)(-40°) (-25°) (-10°) (0°) (10°) (30°) (50°) (70°) (90°) (115°)-40° -13° 0° 20° 40° 60° 80° 120° 160° 195° 240°t min = -40°F(-40°C)fluid temperature range t in °F (°C)t max = +240°F(+115°C)Details regarding the choice of hydraulic fluidTo select the correct hydraulic fluid in open circuit applications,the temperature in the tank in relation to the ambient temperaturemust be considered.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 the selectiondiagram). We recommend that the highest possible viscosityrange should be selected in each case.Example: At an ambient temperature of X°F (X°C) an operatingtemperature of 140°F (60°C) is set in the circuit. In theoptimum operating viscosity range (ν opt ; shaded area) thiscorresponds to the viscosity classes VG 46 or VG 68; to beselected: VG 68.Please note: The leakage fluid temperature, which is affectedby pressure and rotational speed, is always higher than the circuittemperature or tank temperature. At no point in the systemmay the temperature be higher than 240°F (115°C) for sizes 5to 200 or 195°F (90°C) for sizes 250 to 1000.If this cannot be achieved due to unusual operating parametersor high ambient temperatures, we recommend to apply bearingflushing at port U (sizes 250 ... 1000) or the use of a flushingand boost pressure valve (see page 30).FiltrationThe finer the filtration, the cleaner the fluid, the longer the servicelife of the axial piston unit.To ensure proper function of the axial piston unit, the Hydraulicfluid must have a cleanliness level of at least20/18/15 according to ISO 4406.At very high hydraulic fluid temperatures (90°C to max. 115°C, notpermitted for sizes 250 to 1000), a cleanliness level of at least19/17/14 according to ISO 4406 is required.Please contact us if these cleanliness leveles cannot be achieved.