1. Product Overview

This product isA full - set repair kit for Rexroth A4VG series swash - plate axial piston pumpsofthe full - set repair kit. The A4VG series is widely used in various closed - circuit hydraulic systems. When the pump experiences internal leakage, insufficient pressure, reduced efficiency, or abnormal noise, this repair kit usually needs to be replaced to restore its performance.

2. Core Components

Piston: Made of high - strength alloy steel, the surface is precisely ground and hardened to ensure a tight fit with the cylinder block.
Cylinder Block: Also known as the “nine - hole disc”, it is the core component that houses the pistons. The repair kit usually includes a complete cylinder block assembly or individual cylinder block accessories.
Valve Plate: A pair of precisely ground metal discs (usually made of copper alloy or stainless steel) responsible for the intake and discharge of hydraulic fluid. It is a key part that determines the pump's efficiency and noise level.
Spindle: A drive shaft connected to the cylinder block via a spline. The repair kit may include related parts such as shaft seals or bushings.
Bearings and Seals: Includes deep - groove ball bearings, cylindrical roller bearings, as well as a full set of skeleton oil seals, O - rings, etc., to ensure mechanical strength and sealing performance.

3. Core Features

Targeted Repair: Specifically solves the common problems of “internal leakage” and “scratches on the valve plate surface” in the A4VG series pumps. After repair, the volumetric efficiency of the pump can usually be restored to over 95%.
High Cost - effectiveness: Compared with replacing the entire pump assembly, using this repair kit for major repairs can save60% - 70%or more in costs.

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A4VG28 40 56 71 90 125 180 250 Cylinder block, plunger, valve plate repair kit, main shaft oil seal