A20VLO190DRS/10R Rexroth Variable Double Pump 190cc 350bar

Product Overview

The A20VLO190DRS/10R-NZD24N00 and A20VLO190LG1S/10R-NZD24K02-S belong to the Bosch Rexroth A20VLO series 10 swashplate axial piston variable double pumps (back-to-back design) for open-circuit multi-circuit systems. Two identical rotary groups are integrated back-to-back with a common suction port and separate service ports, delivering a compact footprint ideal for space-constrained installations. Flow is proportional to drive speed and displacement and is infinitely variable. Fully interchangeable with original Rexroth units, these pumps support DRS (pressure control with load sensing) and LG1S control codes. Every unit undergoes 100% simulated operating condition testing to verify volumetric efficiency, pressure stability and reliability matching OEM standards. It serves as a core power element in high-pressure pump, motor and valve systems.

Technical Specifications

• Models: A20VLO190DRS/10R-NZD24N00; A20VLO190LG1S/10R-NZD24K02-S (Series 10)
• Displacement (per rotary group): Vg max ≈ 192.7 cm³/rev (nominal 190)
• Nominal pressure: 350 bar
• Peak pressure: 400 bar
• Maximum speed at Vg max: 2500 rpm (with charge pump version)
• Flow (at nnom + Vg max): 2 × approx. 482 L/min
• Control: DRS (pressure control with load sensing); LG1S and other options; supports power and pressure regulation
• Weight (approx., without through drive): approx. 213 kg
• Circuit type: Open circuit
• Charge pump: Optional (L code indicates with charge pump)
• Mounting flange: Common SAE/DIN standards
• Minimum speed: System-dependent, typically not below 500 rpm

Key Technical Advantages

1. Compact back-to-back double-pump design: Two rotary groups share a common suction port and port plate for short axial length, ideal for multi-circuit machines with limited installation space while providing two independent high-pressure outputs.
2. High volumetric efficiency and precision engineering: Based on proven A11VLO components with precision-machined cylinder block, pistons and valve plate; maintains high efficiency under high pressure with rapid, smooth swashplate response.
3. Full interchangeability and modular controls: Exact match to original Rexroth dimensions, shaft, ports and control interfaces enables direct drop-in replacement of DRS/LG1S models; wide control options (pressure, load sensing, power limiting) adapt to diverse machine requirements.
4. Long-life bearings and reliable sealing: High-strength materials and quality bearings/seals deliver excellent contamination resistance; high recommended filtration level suits harsh mobile equipment duty.
5. Optional charge pump and through drive: Charge-pump versions improve self-priming capability and system stability; through-drive allows stacking of gear pumps or same-size axial piston pumps for system expansion.

Application Areas

• Construction machinery multi-circuit hydraulic systems (excavators, loaders)
• Road machinery (milling machines, pavers such as Wirtgen, Vögele)
• Mining and quarry equipment
• Concrete pump trucks and specialty vehicles
• Industrial open-circuit multi-pump systems

Expert Maintenance Tips

1. Confirm rotation direction (R = clockwise) and flange/shaft alignment before installation; pre-fill the case with oil and avoid forced assembly that could damage splines or bearings.
2. Use clean mineral oil within the manufacturer’s recommended viscosity range and filtration meeting ISO standards; fully bleed the system on first start-up to prevent cavitation.
3. Ensure adequate pressure at the common suction port; regularly check the charge pump (if fitted) and pressure/load-sensing settings; avoid prolonged operation at peak pressure.
4. Keep control valves (DRS/LG1S) clean and adjust strictly to factory parameters; replace seals only with genuine or certified parts.
5. For long-term storage maintain internal lubrication and protect against moisture; verify fluid cleanliness and viscosity before restart; never operate below the system’s minimum allowable speed.