A10VNO63DRF/52R-VRC12K68 Rexroth Hydraulic Pump 63cc 250bar

Product Overview

The A10VNO63DRF/52R-VRC12K68 is the 63 cc displacement variant of the Bosch Rexroth A10VNO Series 52/53 axial piston variable pump. Engineered on a swashplate design for open-circuit hydrostatic drives, this pump is specifically optimized for low-pressure applications such as tractor hydraulic systems and fan drives. The A10VNO series is the cost-optimized low-pressure derivative of the well-proven Rexroth A10VSO platform, delivering the reliability of Rexroth’s A10 technology at a reduced price point — an economical alternative to fixed displacement pumps.

The control code “DRF” denotes pressure and flow control (Druck-Förderstromregler), a combined control function that regulates displacement in response to both system pressure and flow demand. As an interchangeability-focused replacement, this unit is assembled to OEM tolerance specifications and subjected to 100% simulated-load bench testing, ensuring mounting dimensions, port locations, and shaft interface match the original Rexroth pump for true drop-in installation.

Technical Specifications

• Model: A10VNO63DRF/52R-VRC12K68

• Series: A10VNO Series 52/53

• Displacement: 63 cm³/rev

• Design: Swashplate axial piston variable pump, open circuit

• Rated Continuous Pressure: 210 bar (3045 psi)

• Peak Pressure: 250 bar (3625 psi)

• Maximum Speed (at Vg max): 2700 rpm

• Control Type: DRF — Pressure and flow control

• Theoretical Flow at 2700 rpm: Approx. 170 L/min

• Theoretical Power at Δp = 210 bar: Approx. 59 kW

• Theoretical Torque at Vg max, Δp = 210 bar: Approx. 210 Nm

• Rotation: R — Right-hand (clockwise, viewed from shaft end)

• Mounting: SAE standard flange

• Weight: Approx. 18 kg (with pressure control)

Data note: Displacement, pressure, speed, and power figures are based on Bosch Rexroth A10VNO Series 52/53 technical documentation (RC 92735) and Rexroth published specifications. The “DRF” control designation corresponds to the pressure and flow controller in the A10VNO control type code. The “VRC12K68” segment of the model code defines port configuration, adjustment range, and seal specification; final configuration should be verified against the unit nameplate prior to order.

Key Technical Advantages

1. Proven A10 technology platform with global field validation. The A10VNO shares the core rotary group architecture of the Rexroth A10 series — a swashplate axial piston design with decades of open-circuit application history. Rexroth’s process controls for this platform deliver excellent durability under low-pressure duty cycles, with bearing and piston-pair wear rates well below those of commodity-grade economy pumps.

2. DRF combined pressure and flow control in a single pump. The DRF control integrates pressure compensation and flow regulation, allowing the pump to deliver variable flow below the pressure setpoint and transition to pressure-holding mode upon reaching the set value — without external pressure valves. This makes it ideal for tractor hydraulic circuits where steering, hitch, and fan drive functions require combined pressure and flow management.

3. Compact lightweight design with high power density. At 63 cc and 2700 rpm, the pump delivers approximately 170 L/min flow and 59 kW power at a weight of only 18 kg. The compact envelope and excellent power-to-weight ratio suit space-constrained tractor engine compartments and fan drive installations, while reducing structural loading on the host machine.

4. Low noise operation and high-speed capability. The A10VNO series maintains effective noise control at high rotational speeds through optimized piston kinematics and swashplate support stiffness. The 2700 rpm maximum speed enables direct engine-driven installation without a step-up gearbox, simplifying the drivetrain and reducing system cost.

Application Areas

• Agricultural tractor hydraulic systems — steering, three-point hitch, and auxiliary hydraulic circuits; the primary application for the A10VNO series.

• Engine fan drive systems — thermostatically controlled hydraulic fan drives for construction machinery and commercial vehicles.

• Compact wheel loaders — boom and bucket hydraulic circuits.

• Municipal utility vehicles — sweeper and water truck implement drive systems.

• Material handling equipment — forklift attachment and travel hydraulic systems.

• Forestry and landscaping machinery — harvester and chipper implement drives.

Expert Maintenance Tips

Pre-installation: Confirm shaft rotation direction (R = right-hand) matches the prime mover. Verify the mounting flange pilot diameter and bolt pattern against the equipment interface; tighten SAE flange bolts in a cross pattern to specified torque. The suction line must be sized for self-priming at maximum flow, with inlet absolute pressure not less than 1 bar.

First start-up: Pre-fill the pump housing with clean hydraulic fluid to prevent dry-start damage to the piston pairs. Run at 500–800 rpm for 2–3 minutes, observing steady flow from the case drain port to confirm the system is purged of air before ramping to operating speed.

Routine service: The A10VNO series requires hydraulic fluid cleanliness of ISO 4406 18/16/13 or better. The DRF pilot circuit is particularly sensitive to contamination — install a 10 μm filter ahead of the control port. Monitor charge pump filter differential pressure and replace the element at 2.5 bar ΔP. Maintain hydraulic fluid temperature between 30°C and 70°C; sustained operation above 80°C accelerates seal degradation.

Control adjustment precautions: The DRF controller has defined permissible adjustment ranges for both pressure and flow setpoints — do not exceed the limits specified in the Rexroth technical manual. Use pressure gauges of accuracy class 1.6 or better for adjustment, and perform a system pressure-holding test after each change to confirm stable operation without abnormal pressure fluctuation.