PVD-2B-42L3DPS-14G-4151F Nachi Axial Piston Pump 45cc Split Flow

Product Overview

The PVD-2B-42L3DPS-14G-4151F, PVD-2B-40P-6G3-4515H and PVD-00B-16P-6AG3-5757B belong to the Nachi PVD series split-flow variable displacement axial piston pumps. Designed specifically for mini-excavator travel systems, these pumps deliver two equal independent flows from a single housing to ensure synchronous supply to left and right travel motors, enabling straight-line travel without operator correction. Featuring a swash-plate variable design with constant horsepower control, they fully utilize engine power while preventing stalling. Fully interchangeable with original Nachi units and compatible with multiple OEM configurations, every unit undergoes 100% simulated operating condition testing to verify flow matching, pressure retention and volumetric efficiency. These pumps serve as core power elements in high-pressure pump, motor and valve systems.

Technical Specifications 

• Models: PVD-2B-42L3DPS-14G-4151F (primary); compatible with PVD-2B-40P-6G3-4515H, PVD-00B-16P-6AG3-5757B
• Displacement (max.): PVD-2B series 22.5 × 2 = 45 cm³/rev; PVD-00B series 8 × 2 = 16 cm³/rev
• Rated pressure: 24.5 MPa
• Peak pressure: Approx. 24.5 MPa (control-dependent)
• Maximum speed: PVD-2B 2600 rpm; PVD-00B 2800 rpm
• Rated speed: PVD-2B 2400 rpm; PVD-00B 2800 rpm
• Minimum speed: 900 rpm
• Control: Constant horsepower control (standard); optional power shift, gear pump
• Weight: PVD-2B approx. 20 kg; PVD-00B approx. 9 kg
• Mounting flange: SAE B 2-bolt
• Shaft: Typical 13T spline
• Flow matching: Port-to-port flow difference <1% for travel synchronization
• Drain: Internal drain type, no external case drain line required

Key Technical Advantages

1. Split-flow equal-output design: Single pump with two independent equal-flow ports and flow difference under 1% ensures synchronized left/right travel motor supply for precise straight-line crawler movement and reduced operator effort.
2. Constant horsepower control and high efficiency: Built-in constant horsepower regulator (with optional gear-pump feedback) keeps pump drive power below the engine power curve to prevent stalling; axial piston design maintains high volumetric efficiency even in the high-pressure range.
3. Compact modular construction with full interchangeability: Extremely short overall length facilitates engine-compartment installation; exact match to original Nachi dimensions, ports and control interfaces enables direct drop-in replacement of PVD-2B/00B series and corresponding OEM units without host-machine modifications.
4. Precision machining and long-life bearings: Swash plate, cylinder block and valve plate manufactured from high-strength materials with precision grinding, combined with quality bearings and seals, deliver excellent contamination resistance and pressure endurance; every unit is 100% tested under simulated conditions to verify reliability and service life.
5. Flexible optional configurations: Rear-mounted single or dual gear pumps, power-shift and valve-block integration options allow easy matching to diverse machine requirements.

Application Areas

• Mini excavators (3–5 tonne class) main travel pumps
• Kubota, Hitachi, Komatsu, Yuchai and similar brand compact excavators
• Crawler undercarriage synchronous travel systems
• Mobile equipment hydraulic systems requiring dual equal-flow output

Expert Maintenance Tips

1. Confirm shaft rotation (P = right-hand, L = left-hand) and flange alignment before installation to avoid forced assembly damage to splines and bearings.
2. Use clean hydraulic oil (recommended ISO VG46 with appropriate filtration); fully bleed the system before first start-up to prevent cavitation.
3. Internal-drain design eliminates external case-drain lines, but verify normal housing pressure; regularly check oil temperature and filters to avoid efficiency loss from high temperatures.
4. Keep the constant-horsepower control spool clean; if flow imbalance or power loss occurs, first inspect the control circuit and optional gear-pump feedback.
5. For long-term storage maintain internal lubrication and protect against moisture; inspect seals and ports before restart and replace seals only with genuine or certified parts.