Short Description
Premium factory-direct aftermarket Rexroth A4VG Series Axial Piston Pump Spare Parts and Rebuild Kits, precision-engineered as 100% drop-in replacements to restore original volumetric efficiency and mechanical timing. Covering standard sizes from A4VG28 up to A4VG250 (Series 32 & 40), our massive inventory features heavy-duty bimetal cylinder blocks, case-hardened pistons, and precise valve plates designed to withstand rigorous pressure reversals up to 400 bar in concrete transit mixers, road rollers, and heavy mining machinery.
Key Highlights
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100% Interchangeable Blueprint Tolerances: All internal internal rotary groups are manufactured strictly to original Bosch Rexroth micro-metric clearances. Fits seamlessly into existing OEM pump housings with zero structural mismatch or play.
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Upgraded Bimetal Cylinder Blocks: Our A4VG cylinder barrels utilize advanced lead-bronze cladding fusion techniques, drastically extending boundary lubrication performance, lowering friction wear, and combating high thermal casing shocks.
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Hardened Pistons & Precision Shoes: Piston assemblies are forged from premium structural alloy steel and undergo induction hardening. Friction shoes are calibrated to a uniform microscopic flatness, preventing shoe-off-plate failure during high-speed travel operations.
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Comprehensive Multi-Model Inventory: One-stop wholesale sourcing for all critical internal groups including Cylinder Blocks, Piston Shoes, Valve Plates (CW/CCW), Retainer Plates, Ball Guides, Drive Shafts, Swash Plates, and complete High-Pressure Seal Kits (FKM/Viton).
HTML Table
| Compatible Pump Sizes | Available Internal Spare Parts & Components | Core Series Coverage |
|---|---|---|
| A4VG28 / A4VG40 / A4VG45 | Cylinder Block (Barrel), Piston Shoes with Retainer, Valve Plate (Left/Right), Ball Guide, Drive Shaft, Saddle Bearing, Swash Plate, Charge Pump (Gerotor), High-Pressure Cradle Seals, Complete Viton O-Ring Rebuild Kits. | Series 32, Series 40, Series 45 High-Pressure Closed Loop Systems |
| A4VG56 / A4VG71 / A4VG90 | ||
| A4VG125 / A4VG140 / A4VG180 | ||
| A4VG250 / A4VG280 / A4VG500 |
FAQ
Q1: Since the A4VG is a closed-loop pump, rotation direction matters. Do your repair kits support both Clockwise (R) and Counter-Clockwise (L) orientations? A: Yes, absolutely. Internal components like the Valve Plate are specifically machined for Right-Hand (CW) or Left-Hand (CCW) fluid porting. When putting together your wholesale order or repair batch, please specify your pump’s rotation code from the nameplate (e.g., A4VG90DGDT1/32R), and our engineers will supply the exact directional matching components.
Q2: Do you supply the built-in charge pump (boost pump) for the A4VG series as well? A: Yes, we keep a massive stock of auxiliary charge pumps (internal gerotor assemblies) for the Rexroth A4VG series. Because a failure in the closed-loop charge circuit is a primary cause of main piston scoring, we highly recommend replacing the charge pump when conducting a full rotary group overhaul.
