Rexroth A4V Series Variable Displacement Pump Parts & Rotary Group (A4V40, 56, 71, 90, 125, 250)

Key Specifications

Overview

HYLINK supplies precision-engineered Bosch Rexroth A4V series (A4V40, A4V56, A4V71, A4V90, A4V125, A4V250) swashplate-design variable axial piston pump replacement parts and complete rotary group overhaul kits. Fully compatible and 100% interchangeable with genuine Bosch Rexroth components, every part is manufactured to exact original tolerances and thoroughly inspected before shipment. This provides a high-performance, cost-effective replacement solution for repair shops, hydraulic distributors, and equipment service fleets worldwide.

Product Overview

The Bosch Rexroth A4V series variable displacement axial piston pumps are built for demanding closed- and open-circuit hydraulic applications. Operating under high system pressures (up to 400 bar continuous / 450 bar peak) and harsh working conditions, internal components—such as the drive shaft, cylinder block, pistons with slipper shoes, swashplate, valve plate, and ball guide—undergo progressive mechanical friction and wear over long-term use. This can result in diminished output flow, elevated system temperatures, internal leakage, or sluggish displacement response.

HYLINK manufactures high-precision complete rotary groups and individual replacement components across all A4V frame sizes from 40 to 250 cm³/rev. Crafted from high-tensile forged alloy steel and wear-resistant bronze compositions, each part undergoes precision CNC machining and micron-level CMM quality verification. This enables service technicians to rebuild worn internal rotating assemblies directly without replacing the expensive pump casing, drastically reducing repair costs and minimizing machine downtime.

Available Components

Below is the standard component list for Bosch Rexroth A4V series hydraulic pumps. Individual spare parts and complete overhaul repair kits are both available:

Quality Assurance & Manufacturing

Every HYLINK pump and replacement part undergoes strict quality control before shipment:

l Dimensional accuracy — checked with high-precision CMM (Coordinate Measuring Machines) to guarantee an exact fit with original pump housings.

l Material metallurgy — manufactured from premium forged steel and high-wear-resistant alloys to prevent premature fatigue.

l 100% performance test — every complete pump assembly is tested on our dynamic hydraulic test rig for pressure, flow rate and efficiency under full working load.

Packing, Shipping & Warranty

l Packaging — anti-rust protective film + heavy-duty foam cushioning + standard export fumigation-free wooden case (reinforced carton for small spare parts).

l Shipping — express courier (DHL / FedEx) for urgent repair orders; sea or air cargo for bulk orders.

l Warranty — 6 months quality assurance against manufacturing and material defects from the delivery date. In the event of a confirmed quality defect, HYLINK provides hassle-free replacement.

FAQ

Q: Are your SBS pump parts interchangeable with genuine Caterpillar parts?

A: Yes. All parts are produced to original specifications and dimensions and are 100% interchangeable — no modification is required during installation.

Q: What is the minimum order quantity?

A: 1 piece. We supply both individual components and complete rotary group / repair kits.

Q: How fast can you ship?

A: In-stock items are dispatched within 1–3 days; standard production orders take 5–8 days. Express and sea/air freight are both available.

Q: How do I confirm the correct part for my machine?

A: Send us your excavator model, pump model (SBS80 / SBS120 / SBS140) and the part name or photo — our technical team will confirm the correct item before you order.

Q: What warranty do you offer?

A: 6 months against manufacturing and material defects, with replacement support for confirmed quality issues.