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A4VSO40 Pump Parts

The A4VSO40 is a variable displacement piston pump commonly used in mobile hydraulic systems, particularly in construction equipment. It's renowned for its efficiency, reliability, and ability to provide a wide range of flow rates. Rexroth, a leading manufacturer of hydraulic components, is a well-known brand associated with this pump model.

Key Components of the A4VSO40 Pump

A4VSO40 pump exploded view

Cylinder Block Houses the pistons and cylinders.

Swash Plate Controls the angle of the pistons and thus the pump's output.

Valve Plate Directs the flow of hydraulic fluid within the pump.

Piston and Shoe Assembly Converts the swash plate's rotary motion into linear piston movement.

Bearing Assembly Supports the rotating components and reduces friction.

Shaft Transmits power from the drive motor to the pump.

Seal Kit Prevents internal leakage and contamination.

Common A4VSO40 Pump Parts

Piston and Shoe Assembly These components are subjected to high wear and are often replaced as a set.

Seal Kit Includes various seals such as O-rings, shaft seals, and piston seals. Regular replacement is essential to prevent leaks.

A4VSO40 seal kit

Valve Plate Controls the direction of fluid flow and can wear over time.

Bearing Assembly Supports the rotating shaft and can be damaged by contamination or overload.

Swash Plate Controls the pump's output and can be damaged by excessive wear or misalignment.

Common A4VSO40 Pump Problems and Solutions

Leakage Caused by worn seals, damaged O-rings, or excessive wear on the cylinder block. Solution Replace the affected seals or components.

Reduced Flow Can be caused by a worn swash plate, blocked suction line, or internal leakage. Solution Inspect and replace worn components, check for blockages.

Excessive Noise Often caused by cavitation, bearing wear, or misalignment. Solution Check for air in the system, replace worn bearings, and ensure proper alignment.

Overheating Can be caused by inadequate cooling, excessive load, or fluid contamination. Solution Check the cooling system, reduce the load, and change the fluid if necessary.

Maintenance Tips for A4VSO40 Pumps

Regular Fluid Analysis Monitor fluid condition for contamination and degradation.

Filter Replacement Replace filters according to the manufacturer's recommendations.

Inspect for Wear Regularly inspect the pump for signs of wear, such as scoring or pitting.

Proper Lubrication Ensure proper lubrication of all moving parts.

Avoid Overloading Operate the pump within its rated capacity.

By understanding the components and common issues associated with the A4VSO40 pump, you can effectively maintain and troubleshoot this essential piece of hydraulic equipment.

Would you like to know more about specific repair procedures, troubleshooting tips, or the selection of replacement parts for your A4VSO40 pump

Please feel free to ask any specific questions you may have.

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Charge Pumps

Control Valves

Internal Spare Parts,

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Seal Kits

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