A7V117DR1RPF00 Rexroth Bent-Axis Piston Pump 117cc 350bar

Product Overview

The A7V117DR1RPF00 is a Bosch Rexroth A7V Series bent-axis axial piston variable pump with a nominal displacement of 117 cm³/rev, rated working pressure of 350 bar, and peak pressure of 400 bar. Featuring a bent-axis design for open-circuit hydrostatic transmissions, output flow is proportional to drive speed and displacement, with stepless flow adjustment from zero to maximum.

In the model designation, “DR” indicates constant pressure control — when system pressure reaches the set value, the pump automatically reduces displacement to maintain constant pressure, suitable for hydraulic systems requiring prolonged pressure holding. “R” denotes clockwise rotation (viewed from the shaft end), “P” specifies a parallel keyed shaft end, and “F” indicates SAE flange port connections.

The A7V series bent-axis pump features spherical control area design with conical pistons, enabling efficient power transmission at tilted cylinder angles. The high-strength cast iron housing incorporates robust roller bearings with hydrostatic unloading capability, supporting continuous operation at 400 bar. The pump operates on mineral oils and fire-resistant fluids.

Manufactured to exact Rexroth OEM specifications, the mounting dimensions, flange interfaces, and port layouts are fully consistent with the original pump for true drop-in interchangeability. Every unit undergoes 100% simulated operating condition testing before shipment.

Technical Specifications 

• Model: A7V117DR1RPF00

• Series: Rexroth A7V Series (Series 1)

• Pump Type: Bent-axis axial piston variable pump, open circuit

• Nominal Displacement (Vg max): 117 cm³/rev

• Displacement Range: 0 – 117 cm³/rev (stepless variable)

• Rated Working Pressure: 350 bar

• Peak Pressure: 400 bar

• Control Type: DR — Constant pressure control

• Rotation Direction: Clockwise (R — viewed from shaft end)

• Shaft End: P — Parallel keyed shaft

• Port Connection: F — SAE flange ports

• Mounting Flange: SAE standard flange

• Housing Material: High-strength cast iron

• Rated Speed: 1,450 rpm

• Recommended Hydraulic Fluid: HL / HLP mineral oil per DIN 51524

• Minimum Inlet Absolute Pressure: 0.08 MPa

• Fluid Viscosity Range: 10–1,000 cSt (optimal 16–36 cSt)

Key Technical Advantages

1. DR Constant Pressure Control for Precise Pressure Holding: The DR constant pressure control is the defining technical feature of this model. When system pressure reaches the controller setting, the control valve drives the pump’s bent-axis angle to decrease, and pump displacement automatically reduces to a level sufficient only to compensate for leakage, maintaining constant system pressure. In applications requiring prolonged pressure holding such as hydraulic presses and die-casting machines, this mechanism eliminates the power waste and fluid heating caused by high-pressure relief valve flow in fixed-displacement systems.

2. Bent-Axis Design with Spherical Control Area: The A7V series features a bent-axis (inclined shaft) design with conical piston arrangement. The spherical valve plate design maintains proper sealing contact between the cylinder barrel and valve plate during swivel motion, reducing distribution losses and wear. Compared with swashplate designs, the bent-axis structure imposes smaller lateral forces on pistons, achieving higher mechanical efficiency.

3. High-Stiffness Roller Bearing Support System: The rotating group is supported by robust roller bearings with hydrostatic unloading capability, supporting continuous operation at 400 bar. The spherical control area and bearing support design enable automatic self-centering, low stable speed, low noise, and long service life. The short and robust bearing system further extends service life.

4. Comprehensive Control Options and Fluid Compatibility: The A7V series offers extensive control options including LV (constant horsepower control), DR (constant pressure control), EL (electric proportional control), HD (hydraulic control), MA (manual control), and more, configurable to match specific system requirements. The pump supports operation on mineral oils and fire-resistant fluids; when operating on HFD or ecologically acceptable fluids, technical data limitations and seals per RE 90223 and RE 90221 must be observed.

5. A7V Series Drop-In Interchangeability: The A7V117DR1RPF00’s mounting flange, shaft extension dimensions, and port layout fully comply with A7V series standards, enabling drop-in interchangeability with original pumps of the same specification. No coupling, piping, or mounting base modification is required. The A7V series covers displacements from 20 to 500 cm³/rev, with high consistency in mounting interfaces across different sizes within the series.

Application Areas

• Hydraulic Presses: Main hydraulic pumps for hydraulic presses, die-casting machines, and extrusion machines — constant pressure holding applications

• Static Pile Drivers: Main oil pump for static pile drivers, a typical application for A7V107LV1LZF00 models

• Construction Machinery: Excavators, cranes, loaders — main or auxiliary hydraulic systems

• Metallurgical Machinery: Rolling mills, forging machinery, continuous casting equipment

• Marine Hydraulics: Ship steering gear, deck machinery, marine cranes

• Mining Machinery: Coal mining equipment, mine hoisting equipment

• Industrial Hydraulics: Injection molding machines, test stands, machine tool power units

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The A7V117DR1RPF00 uses SAE flange mounting. Tighten flange bolts in diagonal sequence for even loading. Check that the original mounting base locating step is in good condition — repair the base before installing a new pump if worn.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump with clean HL/HLP mineral oil through the case drain port before installation. Start at the lowest drive speed and observe a steady oil flow from the case drain port free of bubbles. The DR-controlled pump produces near-maximum displacement until system pressure reaches the set value, and a steady leakage flow from the case drain port is normal. Once bleeding is complete, gradually increase to working pressure.

3. DR Constant Pressure Controller Setting Verification: The DR controller pressure setting is factory-calibrated to standard specifications. After pump replacement, verify the setting matches the original system using a calibrated pressure gauge. If adjustment is required, use dedicated tools and record the original setting for restoration. The pressure setting must not exceed the rated pressure of system components.

4. Rotation Direction Verification: This model is clockwise rotation (R — viewed from shaft end). Driving it counter-clockwise is strictly prohibited — incorrect drive direction will reverse the suction and pressure sides, causing severe rotating group damage within a short period.

5. Fluid Cleanliness and Viscosity Management: Use HL/HLP mineral oil with a viscosity range of 10–1,000 cSt (optimal 16–36 cSt). System filtration should achieve β10 ≥ 75. Replace filter elements after the first 500 operating hours, then every 1,000 hours or annually thereafter. Fluid contamination is a primary cause of premature axial piston pump failure.

6. Case Drain Line Configuration: The case drain line must return directly to the reservoir with backpressure not exceeding 2 bar. The drain line inner diameter must be sufficient to ensure unobstructed drainage during cold-start high-viscosity conditions.