Bosch Rexroth | AA10VG18HD3110L-NSC66F025S-S
AA10VG18HD31/10L-NSC66F025S-S
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The AA10VG18HD31/10L-NSC66F025S-S variable piston pump belongs to the A10VG Variable Piston Pumps series produced by Bosch Rexroth for closed-loop hydrostatic drives. It adjusts swashplate angle to regulate flow in mobile hydraulic automation such as propel drives. The unit has a nominal displacement of 18 cm³ per revolution, enabling compact packaging while still delivering the flow needed for medium-duty circuits. When operated at the maximum continuous speed of 4000 rpm the pump supplies up to 72 l/min, supporting travel functions on compact machines. Minimum speed of 500 rpm allows low-flow standby without loss of control. A splined 7/8-inch 13-tooth 16/32DP shaft end transfers torque into the rotating group and simplifies coupling to standard diesel engine gearboxes. The boost section moves 5.5 cm³ per revolution to maintain case filling and purge air from the main suction line, and its suction port is threaded M26×1.5 for direct hose connection. Boost pressure can rise to 25 bar to prevent cavitation at high swash angles.
The pump handles nominal pressure of 300 bar while the housing and rotating group withstand brief peak events up to 350 bar, supporting dynamic load changes encountered during acceleration and hill climbing. At a differential pressure of 300 bar the drive transmits 86 Nm to the shaft and can deliver 36 kW, matching power outputs of small industrial engines. Intermittent operating speed extends to 5200 rpm for short bursts, while the limited maximum speed of 4850 rpm applies when displacement changes are restricted, letting designers choose between response and longevity. Two service ports, size M27×2, provide A and B work connections for loop lines, and separate M12×1.5 control ports accept pilot pressure to modulate the swashplate in both directions. These threaded interfaces simplify rigid tube installation and reduce leakage paths in mobile equipment.
Technical Specifications
Boost Pump Displacement
5.5 cm3/rev
Boost Pump Peak Pressure
25 bar
Boost Suction Port (s)
M26x1.5
Control Ports (x1/x2)
M12x1.5
Intermittent Max Speed
5200 rpm
Limited Max Speed
4850 rpm
Max Continuous Speed
4000 rpm
Max Flow @ Vg Max, Nmax
72 l/min
Max Power @ Δp 300 Bar
36 kW
Minimum Speed
500 rpm
Nominal Displacement
18 cm3/rev
Nominal Pressure
300 bar
Peak Pressure
350 bar
Service Ports (a/b)
M27x2
Shaft End Type
S Splined 7/8in 13T 16/32DP
Torque @ Δp 300 Bar
86 Nm
1620 Old Apex Road
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