A4V Tandem Hydraulic Piston Pump

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Product details

A4V Tandem Hydraulic Piston Pump

1. Product Overview

A4V tandem hydraulic piston pump mostly refers to the Rexroth A4V series axial piston pump assembled in tandem layout, a core power source for closed/open-loop mobile hydraulic systems. Two pump units share one input shaft for synchronous drive, saving installation space while supplying independent pressure oil for separate circuits. It is widely fitted on excavators, concrete mixers, road rollers and heavy construction machinery, available in original OEM and mature aftermarket replacement versions for equipment assembly and daily maintenance.

2. Key Structural & Performance Features

Parameter Details

Core Structure Twin axial piston pump units on a common input shaft (tandem arrangement)

Displacement Range Common single-section displacement: 40–180mL/r, customizable combined specs

Control Modes Pressure cut-off, load sensing, constant power variable control optional

Max Continuous Pressure Up to 35MPa for heavy-duty working conditions

Mounting Style Standard SAE flange, direct engine PTO connection

Seal Option NBR standard seals; FKM high-temperature seals optional

Recommended Oil ISO VG46 anti-wear hydraulic oil

Operating Temperature -20℃ ~ 90℃

3. Working Principle

The engine drives the shared shaft to rotate both pump sections simultaneously. Each pump independently draws and outputs pressurized oil for different branches of the hydraulic system (e.g. travel circuit + working circuit). Variable swashplate adjusts displacement automatically per load demand to cut idle power loss. The tandem design eliminates extra transmission parts, lowers mechanical loss and ensures synchronized speed output of two pumps.

4. Core Advantages

1. Compact tandem structure reduces overall size, perfect for narrow engine compartment layouts of construction machinery.

2. Two independent oil outlets supply separate loops at the same time, simplifying overall hydraulic system piping.

3. Mature variable control modes adapt to fluctuating load cycles of excavation, mixing and road compaction work.

4. Standardized interface dimensions support direct replacement for original A4V tandem pumps, shortening on-site downtime.

5. Robust casing and friction pairs resist vibration and dust in harsh construction sites for long service life.

5. Typical Application Scenarios

- Excavators, skid steer loaders;

- Concrete mixer truck hydraulic drive systems;

- Road rollers, pavers and other road machinery;

- Agricultural tractors, large sanitation vehicles and other mobile heavy equipment.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch , hydraulic system

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