LD-A4VG56 56cc High Pressure Closed Circuit Variable Piston Pump | Heavy-Duty Hydraulic Pump HYDSUNRIDA

LD-A4VG56 56cc High Pressure Closed Circuit Variable Piston Pump | Heavy-Duty Hydraulic Pump HYDSUNRIDA

HYDSUNRIDA LD-A4VG56 56cc closed circuit variable piston pump, 400bar nominal & 450bar peak pressure, 1:1 OEM replacement, ISO9001 & SGS certified, factory direct supply for construction and mining machinery.

 LD-A4VG56 56cc high-pressure closed circuit hydraulic piston pump. 1:1 non-destructive replacement for imported pumps, strict factory testing, stable heavy-load performance, cost-effective price and full after-sales service for engineering hydraulic systems.

1. Product Overview

LD-A4VG56 is a heavy-duty closed-circuit variable piston pump with 56cc displacement. Rated at 400bar (450bar peak), it supports 24/7 full-load continuous operation.It features low leakage and high efficiency, supporting 1:1 non-destructive replacement of standard A4VG56 pumps. No modification or debugging is needed for cost-effective upgrade.

2. Quality Certification & Testing

Certified with ISO9001 & SGS, all pumps comply with industrial hydraulic standards for stable and consistent quality.Every unit passes strict pressure, leakage and endurance tests to ensure ultra-low failure rates under heavy loads.

3. Core Technical Parameters & Control Modes

3.1 Basic Specifications

• Rated Displacement: 56 ml/r (Standard closed circuit displacement)

• Nominal Pressure: 400 bar

• Peak Pressure: 450 bar

• Structure: Swashplate piston design, rigid housing, high strength, low failure, easy maintenance

• Applicable Circuit: Closed hydraulic circuit

• Hydraulic Oil Viscosity: 35-55 mm²/s

• Working Performance: 24h non-stop full-load continuous operation

• Warranty: 12-month complete machine warranty

3.2 Control Modes

• DA Speed Control: Adaptive speed regulation for stable operation

• EZ Proportional Control: High-precision electro-mechanical adjustment

• HD Hydraulic Control: Sensitive hydraulic servo control for heavy loads

4. Core Advantages

4.1 1:1 Zero-Modification Replacement

Full dimensional and parameter compatibility enables direct replacement of imported pumps, cutting upgrade and maintenance costs.

4.2 Factory Direct Supply

Factory direct sales with competitive pricing. Ample spot stock ensures fast delivery and bulk supply.

4.3 Heavy-Load Durability

High-strength alloy components and precision grinding deliver excellent wear and pressure resistance for long service life.

4.4 Low Heat & High Efficiency

Optimized internal structure reduces heat and leakage, improving overall hydraulic system efficiency and stability.

4.5 Custom OEM/ODM Service

Custom OEM/ODM service supports personalized pressure and flow parameters for special working conditions.

4.6 Full-Cycle After-Sales Service

Full-process support covers model selection, installation guidance and professional after-sales service.

5. Full Series Standard Models (LD Upgrade Version)

LD-upgraded version features higher precision, tighter sealing and stronger durability than standard pumps.

5.1 DA Speed Sensing Control Series

LD-A4VG56DA1D3L/32R-NZCXX, LD-A4VG56DA2D3L/32R-NZCXX, LD-A4VG56DA1D2L/32R-NZCXX, LD-A4VG56DA2D2L/32R-NZCXX

5.2 EZ Proportional Control Series

LD-A4VG56EZ1D3L/32R-NZCXX, LD-A4VG56EZ2D3L/32R-NZCXX, LD-A4VG56EZ1D2L/32R-NZCXX, LD-A4VG56EZ2D2L/32R-NZCXX

5.3 HD Hydraulic Control Series

LD-A4VG56HD3D3L/32R-NZCXX, LD-A4VG56HD2D3L/32R-NZCXX, LD-A4VG56HD3D2L/32R-NZCXX

5.4 General Standard Series

LD-A4VG56 32R-NZCXX, LD-A4VG56 32N-NZCXX, LD-A4VG56-NZCXX

6. Application Fields

Widely used in construction, mining, concrete machinery, machine tools and test benches. Perfect for imported pump replacement and domestic hydraulic system renovation.