Bosch Rexroth | SYHDFEN-1X250R-VZB25U99-0000-A0R0V
SYHDFEN-1X/250R-VZB25U99-0000-A0R0V
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The SYHDFEN-1X/250R-VZB25U99-0000-A0R0V unit is produced by Bosch Rexroth within the SYD Hydraulic Control Systems series and is intended to supply regulated fluid power in automated hydraulic circuits. It moves 250 cm³ of hydraulic fluid per revolution, establishing the basic delivery volume for each cycle. Rotation is clockwise, so drive trains must match that direction. A maximum speed of 1900 rpm sets the upper limit for the prime mover, while a flow of 375 l/min at 1500 rpm covers standard-duty requirements. When operated at full speed, flow climbs to 475 l/min to serve high-demand actuators. The product can transfer 277 kW at a 350 bar pressure drop, furnishing the power needed for large hydraulic tasks. At the same pressure, it produces 1391 Nm of torque, which defines motor sizing. A moment of inertia of 0.0959 kg·m² indicates the rotating mass the drive motor must accelerate.
The fluid temperature range from –20 °C to +70 °C permits operation in typical mobile or industrial environments, and the design calls for mineral oil classified as HL or HLP to maintain seal compatibility. A maximum operating pressure of 350 bar limits system load, while a minimum operating pressure of 20 bar prevents internal cavitation. Suction stability is maintained with an allowable inlet pressure up to 30 bar and a minimum inlet pressure of 0.8 bar absolute, giving designers flexibility in reservoir height. Torque is transmitted through a W 60 × 2 × 28 × 9g splined shaft, providing positive engagement with the drive source. A U99 universal through-drive permits an additional pump to be mounted in series, letting users expand circuit capacity without separate couplings.
Technical Specifications
Displacement
250 cm³
Flow At 1500 Rpm (vg Max)
375 l/min
Fluid Temp Range
−20 to +70 °C
Hydraulic Fluid
Mineral Oil (HL/HLP)
Max Flow (vg Max)
475 l/min
Max Inlet Pressure (s)
30 bar
Max Operating Pressure
350 bar
Max Power (Δp 350 Bar)
277 kW
Max Speed (vg Max)
1900 rpm
Max Torque (Δp 350 Bar)
1391 Nm
Min Inlet Pressure (s)
0.8 bar abs
Min Operating Pressure
20 bar
Moment Of Inertia
0.0959 kgm²
Rotation
Clockwise (R)
Splined Shaft Profile
W 60 x 2 x 28 x 9g
Through-drive
U99 (Universal)
1620 Old Apex Road
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