AA10VSO100DRG/32R-VKD72U99E

The AA10VSO100DRG/32R-VKD72U99E variable pump is produced by Bosch Rexroth for the A10VSO Variable Pumps series. It supplies adjustable hydraulic flow to actuators in automated machinery and mobile equipment. The pump turns clockwise, matching power units that standardize on R-rotation shafts. Its geometric displacement of 6.10 in³ per revolution determines the volumetric output per shaft turn and defines the range of flow control. A case volume of 0.580 gal provides internal oil buffering to lubricate the rotating group during transient load changes. When driven at nominal speed with the swashplate at maximum displacement, the unit delivers 52.8 gpm, which covers medium-size circuit requirements. Continuous operation is permitted up to 2000 rpm at maximum displacement, allowing direct coupling to common diesel engine PTOs. The maximum working pressure reaches 5100 psi, enabling high force actuation without oversizing cylinders, while a nominal pressure rating of 4100 psi supports long-term duty cycles. An allowable inlet pressure of 145 psi lets the pump accept boosted suction lines to prevent cavitation under fast stroking.

The suction side may also operate down to 12 psi absolute, so the pump can draw fluid from lightly pressurized reservoirs in compact power units. High-side pressure must not fall below 145 psi absolute, maintaining adequate load on the pistons for stable swashplate control. The case drain circuit is limited to 30 psi absolute, which calls for unrestricted return lines to avoid seal stress. A rotor inertia of 0.396 lb-ft² keeps acceleration torque low, helping drive controllers start and stop the shaft quickly in variable-speed systems. Under a 280 bar load at full displacement the pump absorbs 125 hp, a figure used to size prime movers and cooling loops. At the same working point it transmits 328 lb-ft of torque, which informs coupling and shaft design. If the displacement is reduced below the maximum setting, shaft speed may rise to 2400 rpm, extending the available flow range for intermittent peaks. The assembly weighs 109 lb without a through drive section, so cabinet rails and mounting brackets need to support roughly 50 kg.