Rexroth A4vg Hydraulic Pump for Hitachi Excavator

REXROTH A4VG PUMP
Rexroth A4VG hydraulic pump for HITACHI excavator
Hydraulic variable displacement axial pump A4VG40, A4VG56, A4VG71, A4VG90, A4VG125, A4VG180, A4VG250DescriptionSeries 32
Nominal pressure 400 bar
Peak pressure 450
Control device: NV, HD3, HW, DG, DA1, DA2, EP3, EP4, EZ1, EZ2
The A4VG axial piston variable pump in swash plate design for hydrostatic closed circuit transmissions
- Flow is proportional to drive speed and displacement and is infinitely variable
- Output flow increases with the swivel angle of the swash plate from 0 to its maximum value
- Flow direction changes smoothly when the swash plate is moved through the neutral position
- A wide range of highly adaptable control devices is available for different control and regulating functions
- The pump is equipped with two pressure-relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload
- The high-pressure relief valves also function as boost valves
- The integrated boost pump acts as a feed and control oil pump
- The maximum boost pressure is limited by a built-in boost pressure relief valve
- The integral pressure cut-off is standardTechnical Data
Table of values (theoretical values, without efficiency and tolerances; values rounded)SizeA4VG40A4VG56A4VG71A4VG90A4VG125A4VG180A4VG250Displacement
variable pumpVg maxcm340567190125180250boost pump (20 bar)Vg Spcm38.611.619.619.628.339.852.5Speed
maximum Vg maxconti.rpm4000360033003050285025002400limited maximumlimitedrpm4200390036003300325029002600intermittent max.Min.rpm5000450041003800345030002700nminrpm500500500500500500500Flow
continuous and Vg maxl/min160202234275356450600Power
continuous Vg max400 barkW107134156183237300400Torque
at Vg max400 barNm25535645157279511441590100 barNm63.589112.8143198.8286398Moment of inertiaJGRkgm20.00380.00660.00970.01490.02320.04440.0983Angular accelerationαrad/s23000024000210001800014000110006700Filling capacityVL1.11.51.31.52.13.16.3Weight approx.mkg3138506080101156