Piston Pumps – Repair, Overhaul, And Testing On Site…

Pompa oleodinamica a pistoni assiali – riparazione TFS Service Partner

TFS has been a Bosch Rexroth Certified Excellence Service Partner since 1997 and a Kawasaki Precision Machinery Authorized Service Centre since 2024. For this product line, it operates an in-house test bench calibrated for swashplate axial piston pumps (fixed and variable displacement) and radial piston pumps. Repairs follow the manufacturer’s protocol: disassembly, measurement of tolerances on the cylinder block, slide, and swash plate, replacement of original gasket kits, reassembly in a controlled environment, and hydraulic testing at nominal flow rate and pressure with recording of operating curves. For machines in production, TFS provides on-site support with technical teams for diagnostics, replacement, and commissioning. Replacement components are sourced exclusively through the manufacturers’ official channels, a necessary condition for maintaining the validity of the RINA/Bureau Veritas tests and certifications required in the marine, steel, and Oil & Gas sectors. Overhauls are documented with a signed test report and a machine file archived in accordance with ISO 9001 procedures.

Product Families

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Types of piston pumps that TFS overhauls

TFS services fixed-displacement axial piston pumps with swash plates (Bosch Rexroth A2FO, A10FO series), variable-displacement pumps with DR/DRG/DFR/DFLR regulators (A10VSO, A4VSO, A11VLO), closed-loop pumps for hydrostatic transmissions (AA10V, AA4V), and radial piston pumps. The Kawasaki range covered includes K3V, K3VL, and K5V on excavators and earthmoving machinery. For each manufacturer’s model, the overhaul uses original spare parts and calibration procedures in accordance with the manufacturer’s service manual.

Test bench overhaul procedure

Every pump received undergoes: receipt and visual inspection, disassembly with component cataloging, dimensional inspection of the cylinder block and shoes, verification of the inclined plate’s flatness, complete replacement of the OEM gasket kit, reassembly in a filtered atmosphere, hydraulic bench testing with measurement of flow rate, pressure, and volumetric efficiency. The test report includes performance curves and is signed by the responsible technician, ensuring full traceability of the service.

On-site service and scheduled maintenance

For production applications, TFS organizes on-site service teams: field diagnostics, pump replacement with the machine in line, and support for restart. For fleets of identical pumps (quarries, steel mills, presses, shipbuilding plants), TFS implements preventive maintenance programs with scheduled overhaul cycles and management of spare parts held on consignment at the customer’s site. This approach drastically reduces machine downtime and allows interventions to be concentrated during scheduled shutdown periods.

Brands we service: Bosch Rexroth – A10VSO and A4VSO piston pumps, Kawasaki K3V and K5V – Authorized Service Centre, Linde Hydraulics – hydrostatic transmissions, Hydreco – pumps for industrial vehicles, Parker – piston pumps, Denison Calzoni – piston pumps, Casappa – MVP axial piston pumps, Hawe – R-series radial piston pumps, Commercial Hydraulics – axial piston pumps, Nachi – PVS and PVD variable piston pumps, Uchida – AP2D piston pumps based on Rexroth technology, Voac Hydraulics – F11 and F12 axial piston pumps.