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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 standard
Technical Data
| Size | A4VG40 | A4VG56 | A4VG71 | A4VG90 | A4VG125 | A4VG180 | A4VG250 | ||
| Displacement variable pump |
Vg max | cm3 | 40 | 56 | 71 | 90 | 125 | 180 | 250 |
| boost pump (20 bar) | Vg Sp | cm3 | 8.6 | 11.6 | 19.6 | 19.6 | 28.3 | 39.8 | 52.5 |
| Speed maximum Vg max |
conti. | rpm | 4000 | 3600 | 3300 | 3050 | 2850 | 2500 | 2400 |
| limited maximum | limited | rpm | 4200 | 3900 | 3600 | 3300 | 3250 | 2900 | 2600 |
| intermittent max. | Min. | rpm | 5000 | 4500 | 4100 | 3800 | 3450 | 3000 | 2700 |
| nmin | rpm | 500 | 500 | 500 | 500 | 500 | 500 | 500 | |
| Flow continuous and Vg max |
l/min | 160 | 202 | 234 | 275 | 356 | 450 | 600 | |
| Power continuous Vg max |
400 bar | kW | 107 | 134 | 156 | 183 | 237 | 300 | 400 |
| Torque at Vg max |
400 bar | Nm | 255 | 356 | 451 | 572 | 795 | 1144 | 1590 |
| 100 bar | Nm | 63.5 | 89 | 112.8 | 143 | 198.8 | 286 | 398 | |
| Moment of inertia | JGR | kgm2 | 0.0038 | 0.0066 | 0.0097 | 0.0149 | 0.0232 | 0.0444 | 0.0983 |
| Angular acceleration | α | rad/s2 | 30000 | 24000 | 21000 | 18000 | 14000 | 11000 | 6700 |
| Filling capacity | V | L | 1.1 | 1.5 | 1.3 | 1.5 | 2.1 | 3.1 | 6.3 |
| Weight approx. | m | kg | 31 | 38 | 50 | 60 | 80 | 101 | 156 |
A4VG Series Hydraulic pump are widely used in hydraulic systems of various industries such as lifting machinery, engineering machinery, metallurgy, mining, shipbuilding, forging press, etc.
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