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AA4VG series (SAE)
AA4VG series (SAE)
A4VG closed circuit variable pump to American standard, SAE flange and ports, charge pump and relief valves integrated. Travel drive on US-built excavators and loaders.
Features
- Swash-plate axial piston variable pump for hydrostatic drives in closed circuits
- Flow is proportional to drive speed and displacement, and is infinitely variable
- Output flow increases from zero to maximum as the swash-plate angle changes
- Sweeping the swash plate through centre reverses the flow direction smoothly
- A wide range of compatible control devices provides various control and adjustment functions
- Two relief valves on each high-pressure side prevent overload of the hydrostatic drive (pump and motor)
- The relief valves also function as charge valves
- Integrated charge pump serves as supply and control pump
- Maximum charge pressure is limited by the integrated charge relief valve
- Integrated pressure cut-off valve is standard
Technical data
| Size | 28 | 40 | 56 | 71 | 90 | 125 | 180 | 250 |
|---|---|---|---|---|---|---|---|---|
| Displacement · variable pumpVg max · cm³ | 28 | 40 | 56 | 71 | 90 | 125 | 180 | 250 |
| Displacement · charge pump (p=20 bar)Vg SP · cm³ | 6.1 | 8.6 | 11.6 | 19.6 | 19.6 | 28.3 | 39.8 | 52.5 |
| Speed · max. at Vg maxnmax continuous · rpm | 4250 | 4000 | 3600 | 3300 | 3050 | 2850 | 2500 | 2400 |
| Speed · limited maximum ①nmax limited · rpm | 4500 | 4200 | 3900 | 3600 | 3300 | 3250 | 2900 | 2600 |
| Speed · intermittent maximum ②nmax interm. · rpm | 5000 | 5000 | 4500 | 4100 | 3800 | 3450 | 3000 | 2700 |
| Speed · minimumnmin · rpm | 500 | 500 | 500 | 500 | 500 | 500 | 500 | 500 |
| Flow · at nmax continuous and Vg maxqV max · l/min | 119 | 160 | 202 | 234 | 275 | 356 | 450 | 600 |
| Power ③ (Δp=400 bar)Pmax · kW | 79 | 107 | 134 | 156 | 183 | 237 | 300 | 400 |
| Torque ③ · at Vg max (Δp=400 bar)Tmax · Nm | 178 | 255 | 356 | 451 | 572 | 795 | 1144 | 1590 |
| Torque ③ · at Vg max (Δp=100 bar)T · Nm | 44.5 | 63.5 | 89 | 112.8 | 143 | 198.8 | 286 | 398 |
| Moment of inertia of drive shaft (rotating parts)J · kgm² | 0.0022 | 0.0038 | 0.0066 | 0.0097 | 0.0149 | 0.0232 | 0.0444 | 0.0983 |
| Max. angular acceleration ④rad/s² | 38000 | 30000 | 24000 | 21000 | 18000 | 14000 | 11000 | 6700 |
| Max. speed change ④rpm | 103 | 81 | 72 | 69 | 64 | 55 | 50 | 34 |
| Torsional stiffness · shaft SNm/rad | 31400 | 69000 | 80800 | 98800 | 158100 | 218300 | 244500 | 354500 |
| Torsional stiffness · shaft TNm/rad | – | – | 95000 | 120900 | – | 252100 | 318400 | 534300 |
| Torsional stiffness · shaft ANm/rad | – | 79600 | 95800 | 142400 | 176800 | 256500 | – | – |
| Torsional stiffness · shaft ZNm/rad | 32800 | 67500 | 78800 | 122800 | 137000 | 223700 | 319600 | 624200 |
| Torsional stiffness · shaft UNm/rad | – | 50800 | – | – | 107600 | – | – | – |
| Filling volumeV · L | 0.9 | 1.1 | 1.5 | 1.3 | 1.5 | 2.1 | 3.1 | 6.3 |
| Weight approx. (without through-drive)m · kg | 29 | 31 | 38 | 50 | 60 | 80 | 101 | 156 |
Data table: theoretical values, excluding efficiency and tolerances; figures rounded. ① Limited maximum. ② Intermittent maximum. ③ At nmax continuous and Vg max. ④ Applies to all shaft ends. AA4VG is the American-standard designation; performance data is identical to A4VG.