PZS-4B-100N3-10 Nachi Axial Piston Pump 28MPa Variable

Product Overview

The PZS series (including PZS-3B/4B/5B/6B and specific order codes PZS-4B-100N3-10, PZS-5B-130N3-10, PZS-6B-180N3-10, PZS-6B-180N4-10) is Nachi’s high-pressure variable-volume axial piston pump featuring a semi-cylindrical swash plate design. It delivers high reliability and energy-efficient performance for industrial hydraulic systems. Pressure-compensation control automatically adjusts flow to maintain set pressure, optimizing energy use. Our units provide full interchangeability with OEM pumps—matching mounting dimensions, ports, and performance curves—and undergo 100% simulated operating-condition testing for reliable drop-in replacement in machine tools, forging equipment, and industrial machinery.

Technical Specifications 

(Data extracted from official Nachi technical manuals and product catalogs; mineral-oil operation)

• Model/Size: PZS-3B, PZS-4B, PZS-5B, PZS-6B (flange mounting type B; examples PZS-4B-100N3-10, PZS-5B-130N3-10, PZS-6B-180N3-10, PZS-6B-180N4-10)
• Geometric displacement (max): 70 cm³/rev (PZS-3B, adjustable 45–70), 100 cm³/rev (PZS-4B, 40–100), 130 cm³/rev (PZS-5B, 51–130), 180 cm³/rev (PZS-6B, 101–180)
• Rated pressure: 21 MPa
• Maximum working pressure: 28 MPa (PZS-3B/4B), 25 MPa (PZS-5B/6B)
• Speed range: 500–1800 min⁻¹ (PZS-6B-220 max 1500 min⁻¹)
• Control: Pressure compensation type (N); pressure adjustment range by code: N3 = 2–21 MPa, N4 = 2–25/28 MPa, N1 = 2–7 MPa; optional 2-pressure 2-flow control (NQ)
• Weight (approx.): 37 kg (PZS-3B), 58 kg (PZS-4B), 86 kg (PZS-5B), 123 kg (PZS-6B-180)
• Additional: Clockwise rotation viewed from shaft end; compatible with IPH series gear pumps for multi-pump combinations; O-ring seals and spherical valve plate design

Key Technical Advantages

1. Semi-cylindrical swash plate and 11-piston low-noise design: The semi-cylindrical swash plate provides high rigidity, enabling an increase to 11 pistons and optimized valve plates that significantly reduce noise and pulsation for quieter, more stable operation.
2. High volumetric efficiency and energy-saving performance: Spherical valve plate maintains optimal hydraulic balance for high volumetric efficiency; pressure-compensation control automatically reduces flow at set pressure, lowering energy consumption under continuous high-pressure duty.
3. High reliability and long service life: O-ring seals on mating surfaces eliminate external leakage; copper-alloy bushings on piston sliding surfaces enhance contamination resistance and support continuous operation up to 28 MPa.
4. Full interchangeability and multi-pump compatibility: Flange, shaft end, and ports match OEM exactly for true drop-in replacement; supports combination with IPH series pumps to expand flow/pressure options and system flexibility.
5. 100% simulated duty-cycle testing: Every unit is verified under full pressure, speed, and pressure-compensation characteristics prior to shipment, ensuring parameter consistency and field-ready performance.

Application Areas

Industrial hydraulic systems including machine tools (machining centers, injection molding machines), forging and forming equipment, main oil sources for industrial machinery, vehicle auxiliary hydraulics, and any fixed or mobile equipment requiring high-pressure, low-noise, energy-efficient variable control. PZS-4B/5B suit medium-flow high-pressure circuits; PZS-6B serves larger-flow main pumps.

Expert Maintenance Tips

• Use flexible couplings; keep shaft misalignment ≤ 0.05 mm and angular error ≤ 1°; mount pump shaft horizontally; maintain suction pressure ≥ –0.03 MPa.
• Use ISO VG 32–68 anti-wear hydraulic oil; operating viscosity 20–50 mm²/s (range 20–200 mm²/s); oil temperature 5–60 °C. If start-up temperature is below 5 °C, run at low pressure and low speed until warm.
• Raise drain line above the highest point of the pump body and submerge the return end in the tank; keep drain back pressure ≤ 0.1 MPa; fit approx. 100 μm strainer on suction side.
• Securely tighten lock nuts after pressure or flow adjustments. When replacing, match the full order code (control range and design number such as N3-10) and verify flange and shaft-end dimensions.