Variable Displacement Pump A4VG - Group VH A/S

10/52 Bosch Rexroth AG | Mobile Hydraulics A4VG | RE 92 003/05.03HW - Hydraulic Control, Mechanical ServoThe positioning cylinder of the pump and therefore the swivelangle is varied in proportion to the movement of the controllever. The pump control is infinitely variable. Each direction offlow is assigned to one direction of lever movement.1,00,80,60,4β in °5V g max10152025303540– β in °– Vg4035302520151050,200 0,2 0,4 0,6 0,8 1,0Swivel angle b at the control lever for swiveling outwards:Start of control at β = 3°End of control at β = 29° (max. displacement V g max )mech. stop: sizes 28...71 ___________ ±40°sizes 90...250 __________ ±35°V gV g maxThe torque necessary at the control lever is between 85 and210 Ncm.The limitation of the operating range of the HW control levermust be fixed in the external control mechanism (required valuesetting).An optional DA control valve allows automotive drive control ofthe vehicle, see page 13.For pressure cut-off, see page 8.Variation: neutral position switch, LThe neutral position switch is closed when the HW controllever is in the neutral position. The switch opens if the controllever is moved out of neutral in either direction.The neutral position switch provides a safety function forsystems that require zero flow under certain operatingconditions (e.g. engine start).Standard model 1 )GraphDirection of rotation – Control – Direction of through put flowDirection of rotationanti-clockwise clockwiseSize Lever Control Through put Operatingdirection pressure flow pressure28...5671...25028...5671...250M B (size 250)BAM A (size 250)a X 2B to A M Ab X 1A to B M Ba X 2A to B M Bb X 1B to A M Aa X 2A to B M Bb X 1B to A M Aa X 2B to A M Ab X 1A to B M BSizes 28, 250 Sizes 40...180zero position switchX 1anticlockwiseclockwiseX 2ZView ZM A (size 28) anticlockwiseabclockwiseM B (size 250) M B (size 28)Technical data - neutral position switchLoading20 A (continuous)Switching power 15 A / 32 V (DC)4 A / 32 V (AC - inductive)Connector design DEUTSCH male connectorDT04-2P-EP04(mating connector see page 48)BM BM AAModel with DA control valve and neutral position switch 1 )X 1X 2abzero position switch1 ) size 28 and 250 without port F a1 and F S