Rexroth A4VSO Series Variable Displacement Pump Parts & Rotary Group (A4VSO40 to A4VSO1000)
100% interchangeable rotary group & spare parts engineered for Bosch Rexroth A4VSO open-circuit industrial hydraulic pumps, in-stock with OEM-grade quality.
- ✓100% Interchangeable
- ✓Durable & High-Wear Resistance
- ✓Large Stock & Fast Shipping
Key Specifications
Item | Details | |
Brand | HYLINK | |
Product Category | Industrial Hydraulic Pump Spare Parts / Rotary Group / Overhaul Repair Kits | |
Compatible Brand | Replacement for Bosch Rexroth (A4VSO Series) — 100% Interchangeable | |
Available Frame Sizes | A4VSO40 / A4VSO71 / A4VSO125 / A4VSO180 / A4VSO250 / A4VSO355 / A4VSO500 / A4VSO750 / A4VSO1000 | |
Applicable Machines | Heavy forging presses, plastic injection molding machines, steel mills, marine winches, and mining equipment | |
Minimum Order Quantity | 1 Piece | |
Delivery Time | 1–3 days for in-stock items / 5–8 days for standard orders | |
Price | Inquire for a direct factory quote | |
Warranty | 6 months against manufacturing and material defects | |
Overview
HYLINK supplies precision-engineered Bosch Rexroth A4VSO series (A4VSO40, A4VSO71, A4VSO125, A4VSO180, A4VSO250, A4VSO355, A4VSO500, A4VSO750, A4VSO1000) swashplate-design axial piston variable pump replacement parts and complete rotary group overhaul kits. Specially designed for industrial drives and heavy machinery, 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 industrial plant maintenance teams worldwide.
Product Overview
The Bosch Rexroth A4VSO series swashplate axial piston variable pumps are widely utilized in open-circuit industrial hydraulic systems. Operating under continuous duty cycles and demanding load variations, internal rotating components—such as the drive shaft, cylinder block, pistons with slipper shoes, swashplate, valve plate, and ball guide—experience heavy sliding friction and thermal stress over extended operation. Mechanical wear on these critical contact surfaces leads to reduced discharge volume, lower system pressure, excessive fluid heating, and internal leakage.
HYLINK manufactures high-precision complete replacement rotary groups and individual spare parts across the full A4VSO range from 40 to 1000 cm³/rev. Produced from premium forged alloy steel and high-wear-resistant bronze compositions, each component undergoes micron-level CNC machining and CMM quality inspection. This enables industrial maintenance engineers and hydraulic rebuilders to restore factory-level volumetric efficiency and pump performance without purchasing expensive complete casing assemblies.
Available Components
Below is the standard component list for Bosch Rexroth A4VSO series hydraulic pumps. Individual spare parts and complete overhaul repair kits are both available:
Item No. | Part Name | Qty. |
1 | Keyed Shaft | 1 |
2 | Cylinder Block | 1 |
3 | Ball Guide | 1 |
4 | Retainer Plate | 1 |
5 | Piston Slipper | 9 |
6 | Piston | 9 |
7 | Thrust Plate | 1 |
8 | Pressure Plate | 2 |
9 | Spacer Block | 2 |
10 | Valve Plate | 1 |
11 | Bearing Bushing | 2 |
12 | Swash Plate | 1 |
13 | Pin 1 | 1 |
14 | Pin 2 | 1 |
15 | Belleville Spring | 1 |
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.