High-Performance YR10V00004F4 Main Pump for Kobelco SK75 Excavator – Nachi PVD-3B-60L5P-9G-2036B Piston Pump GP

The hydraulic main pump is the powerhouse of any excavator‘s hydraulic system, converting engine torque into controlled hydraulic flow for boom, arm, bucket, and travel functions. For the Kobelco SK75 series excavators, the YR10V00004F4 main pump (also referenced as Nachi PVD-3B-60L5P-9G-2036B) is a precision-engineered axial piston pump GP that delivers reliable power and efficiency. Whether you are replacing a worn original unit or performing a major hydraulic system overhaul, this OEM-spec hydraulic pump restores machine performance, tracking accuracy, and fuel economy.

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Engineered for the Kobelco SK75 Excavator Series

The Kobelco SK75 is a 7–8 ton class hydraulic excavator widely used in urban construction, landscaping, utility work, and equipment rental fleets. This machine is known for its compact body, responsive hydraulics, and robust build quality. The SK75 series includes short-reach (SK75SR), ultra-short-reach (SK75UR), and conventional tail swing variants, making it highly versatile for confined job sites.

The YR10V00004F4 main pump is a Nachi PVD-3B series axial piston pump, which is the largest frame size in Nachi‘s split-flow PVD family. This pump features two independent pumping sections within a single housing, each generating equal flow to power the left and right travel motors simultaneously——a critical design for maintaining straight-line travel without operator steering corrections. The “60″ in the model code indicates a maximum total displacement of 60 cm³/rev (typically configured as 60 + 60 cm³/rev + smaller gear pump sections for pilot control purposes), while “L“ specifies left-hand rotation and “5P-9G-2036B“ references the seal type and additional gear pump configuration. The pump is rated for a maximum operating pressure of 245 bar (3,553 psi), ensuring sufficient hydraulic force for heavy-duty digging and lifting applications.

Technical Highlights

• Axial piston split-flow design discharging two equal flows

• Constant horsepower (total power) control – anti-stall technology

• Internal drain type – no external drain piping required

• Flow variation < 1% for balanced system performance

Technical Specifications (Typical for PVD-3B Series – Verify for Your Application):

• Type: Variable displacement axial piston pump (split flow, two independent pumping units)

• Model Code: PVD-3B-60L5P-9G-2036B (with L indicating left-hand rotation)

• Max. Total Displacement: 60 cm³/rev per section; total 120 cm³/rev combined before summing auxiliary sections

• Section Configuration: 60 + 60 cm³/rev + optional/auxiliary sections (small gear pump sections)

• Rated Pressure: 24.5 MPa (3,553 psi); Peak Pressure: 31.9 MPa (4,624 psi) to 36.3 MPa (5,265 psi) depending on operating transients

• Max. Speed (Nachi OEM): 2,400 rpm (rated: 2,200 rpm) for the pump body; application-specific matching to the 4LE2XCUA engine‘s 2,200 rpm governed speed is essential

• Min. Speed: 900 rpm

• Mounting Flange: SAE C 2-bolt arrangement

• Drive Shaft: Spline configuration (typically Z=15)

• Weight: Approximately 27 kg (main pump only)

Engine Compatibility – ISUZU 4LE2XCUA
The YR10V00004F4 main pump is designed to pair with the ISUZU 4LE2XCUA engine, which is the standard power unit for SK75 Series excavators. Misalignment between the pump‘s 24.5 MPa rated pressure / 2,200 rpm nominal speed and the engine‘s torque curve will lead to premature failure or poor performance. Cross-check OEM interface specifications before purchase to avoid hydraulic inefficiency or overheating.

• Engine Model: ISUZU 4LE2XCUA (4J series variant)

• Displacement: 2,179 cm³ (133 in³)

• Power Output: 41 kW (55–56.3 hp) @ 2,200 rpm

• Max. Torque: 200 Nm (147.5 lb-ft)

• Fuel System: Direct injection with turbocharger and intercooler

Compatibility: Kobelco Excavator Models – Detailed List

This main pump is a direct replacement for the following Kobelco excavator models:

• Kobelco SK75 Series (Base Models): SK75, SK75-8, SK75-10, SK75C, SK75E, SK75VS

• Kobelco SK75SR (Short Reach): SK75SR, SK75SR-3F (short tail swing for confined areas)

• Kobelco SK75UR (Ultra-Short Reach): SK75UR, SK75UR-2, SK75UR-3

• Kobelco SK75N (Narrow Track/Configurations): Various narrow-track variants for specific job site clearances and trenching duties

Cross-Reference Part Numbers

• YR10V00004F4 (Kobelco / OEM)

• PVD-3B-60L5P-9G-2036B (Nachi / Technical)

• PVD-3B-60L5P-9G-2036 (Nachi variant)

• HYR10V00004F4 (Hyundai / Aftermarket sourcing variant; not an original Kobelco number)

Why Choose This YR10V00004F4 Main Pump?

1. Superior Straight-Line Travel: The twin-section design supplies equal oil flow to both track systems, preventing the machine from veering off course without operator steering correction. This reduces track wear and improves maneuvering precision on slopes.

2. Total Horsepower Control: The built-in constant horsepower (total power) regulator continuously monitors overall pump load, preventing engine stall during combined digging and travel operations. This anti-stall feature keeps the engine in its optimal torque band under all load conditions.

3. Compact, Space-Saving Design: Short overall length and internal drain eliminate complex external piping, allowing the pump to fit easily within the SK75‘s confined engine compartment.

4. Exceptional Efficiency & Low Noise: Axial piston construction delivers sustained volumetric efficiency (≥ 90%) across high-pressure regimes. The semi-spherical swash plate stabilizes discharge volume while reducing hydraulic noise, which helps meet modern job site sound-level requirements and extends component life.

Signs Your Main Pump Needs Replacement

• Weak digging force or slower-than-normal implement speeds for boom, arm, and bucket operations

• Prolonged cycle times across the full work cycle (dig, lift, swing, dump)

• Poor machine tracking – excavator consistently pulls to one side when traveling straight

• Unusual hydraulic noise (whining, knocking, or screeching originating from the pump area)

• Slow travel speeds even at full engine throttle (2200 rpm)

• Hydraulic oil overheating without external contamination sources

• Metal particles found in the hydraulic oil filter or tank (failure debris)

Installation Recommendations

• Safety First: Read all safety warnings and depressurize the hydraulic system before beginning work. Disconnect the battery ground cable to prevent accidental starting.

• Pump Environment: Thoroughly clean the pump mounting area before disconnecting any hoses to prevent contamination entering the hydraulic circuit.

• Labelling: Label all hydraulic hoses and any electrical / pressure switch connections to ensure correct reassembly.

• Oil & Filter Change: Drain and properly dispose of hydraulic oil; change the filters concurrently to avoid contaminating the new pump.

• Coupling Inspection: Check the pump drive coupling and flexible coupling element for wear and replace if any damage is found.

• Sealing: Install new O-rings and sealing washers on all hydraulic port connections – never re‑use old seals.

• Spline & Flange Alignment: Align the pump drive shaft splines carefully with the engine flywheel housing coupling to avoid damaging the teeth or creating a mis‑alignment that will destroy the coupling or bearings.

• Torque Values: Torque mounting bolts to manufacturer specifications (SAE C two‑bolt flange guidelines: typically 45–60 Nm for M10 bolts; always verify against the exact engine flywheel housing and pump mounting instructions).

• Pre‑Filling: Fill the pump housing with clean, filtered hydraulic oil prior to connecting suction lines or starting the engine to prevent dry start damage.

• System Filling & Bleeding: Fill the hydraulic tank with fresh, approved hydraulic oil (specified ISO VG 46 viscosity grade or Kobelco factory oil specifications). Run the engine at idle (~1000–1200 rpm) and operate all hydraulic functions (boom, arm, bucket, swing, travel) in a controlled sequence to purge air from the system.

• Final Checks: After the bleed process, check all connections for leaks, inspect the oil level and top up as needed, and verify that operating pressures and flow rates align with factory specifications.

Conclusion

The YR10V00004F4 main pump (Nachi PVD-3B-60L5P-9G-2036B) for Kobelco SK75 excavators is a high-quality, OEM-spec axial piston pump GP designed to restore hydraulic performance, tracking accuracy, and fuel efficiency. Whether you are rebuilding an SK75-8, SK75SR, or SK75UR-2 for general construction, landscaping, or utility work, this split-flow pump delivers the power, durability, and precision your excavator needs.

Order your YR10V00004F4 hydraulic pump GP today and get your Kobelco SK75 back to peak performance.