A2FO16/61R-PAB06 Piston Pump for Rexroth R902193820 R902193351 for SR150 SR200 SR220 QY25 QY50 EBZ100 EBZ135 EBZ160

A2FO Series Fixed Displacement Axial Piston Pump — Aftermarket Replacement for Bosch Rexroth A2FO (Sizes 5-1000, Open Circuit, Bent-Axis Design)

The H-STAR A2FO series is an aftermarket replacement line of fixed displacement axial piston pumps with bent-axis design, fully compatible with Bosch Rexroth A2FO series (sizes 5-1000 cc/rev). Designed for open circuit hydrostatic drives, the A2FO delivers constant flow proportional to drive speed and displacement. The bent-axis architecture provides higher mechanical efficiency than swashplate designs, with superior volumetric efficiency and robust performance under heavy continuous loads.

Applications & Compatible Equipment

The A2FO series is widely used across multiple industries:

Construction Machinery: • Concrete mixer truck agitator drives (sizes 56-125) — most common application • Truck-mounted crane hydraulic systems • Road roller vibration drives • Excavator auxiliary pump circuits

Commercial Vehicles: • Truck PTO (Power Take-Off) direct-coupled hydraulic supply • Tipper truck hydraulic systems • Refrigerated truck hydraulic fans

Agricultural Machinery: • Self-propelled sprayer drives • Combine harvester hydraulic systems • Tractor auxiliary hydraulic circuits

Industrial Equipment: • Machine tool hydraulic systems (sizes 10-63) • Hydraulic press supply pumps (sizes 80-250) • Test stand power units • Material handling conveyors

Marine & Offshore: • Deck crane hydraulic supply • Mooring winch drives • Corrosion-resistant options available

Equipment Types: Concrete mixer trucks, dump trucks, cranes, road rollers, excavators, agricultural harvesters, machine tools, hydraulic presses, marine deck equipment.

Note: The A2FO is frequently used as a PTO-mounted pump on trucks — the flange and shaft are designed for direct mounting on truck gearbox PTO outputs. Confirm your PTO spline specification before ordering.

Quality Assurance & Testing

Each H-STAR A2FO pump undergoes the following quality processes before shipment:

• Dimensional Inspection: CMM (Coordinate Measuring Machine) verification of cylinder bore precision, piston diameter, and valve plate flatness per Rexroth tolerances

• Surface Hardness Testing: Piston and slipper surface hardness verified (HRC 58-62 for piston, HRC 55-60 for slipper plate)

• Bearing Inspection: Tapered roller bearing clearance and preload verified per specification

• Assembly Clearance Check: Piston-to-bore clearance (0.015-0.025 mm) and slipper-to-swashplate contact verified

• Pressure Testing: Post-assembly pressure test at nominal pressure (400 bar for sizes 10-200) for 15 minutes to verify sealing, internal leakage, and performance

• Cleanliness Control: All components cleaned and packaged to ISO 4406 cleanliness standard (20/18/15)

• Run-in Test: Low-speed run-in at 500 rpm for 10 minutes to verify smooth operation and noise level

Factory Capability: CNC machining center, hydraulic test bench (up to 500 bar), Mitutoyo CMM precision measurement, surface roughness tester.

FAQ — Frequently Asked Questions

Q: What is the difference between A2FO and A2FM?

A: A2FO is a PUMP (converts mechanical rotation into pressurized hydraulic flow, for open circuits). A2FM is a MOTOR (converts pressurized hydraulic flow into mechanical rotation). They share the same bent-axis internal design but serve opposite functions. If your equipment needs a pump, you need A2FO; if it needs a motor, search for A2FM.

Q: How do I confirm this fits my equipment?

A: Please send us your pump nameplate photo or the complete model code (e.g., A2FO16/61R-PAB06). The model code contains critical information about rotation direction, seal type, shaft type, flange, and port configuration. Different suffixes are NOT interchangeable.

Q: What information should I provide before ordering?

A: Please provide: (1) complete model code from nameplate, (2) equipment brand and model, (3) required rotation direction (R=clockwise or L=counterclockwise), (4) operating pressure and speed, (5) any visible damage photos of your current pump.

Q: Do you supply all sizes from 5 to 1000?

A: Yes. We supply the complete A2FO series from size 5 (4.93 cc/rev) to size 1000 (1000 cc/rev). Contact us with your required size for quotation.

Q: Can the A2FO be used as a motor?

A: The A2FO is designed primarily as a pump. While the A2FM (motor version) shares the same internal rotary group, the A2FO housing and bearing configuration are optimized for pump operation. For motor applications, please use A2FM. Contact us to discuss your specific requirement.

Q: What is the warranty?

A: 12 months from delivery date against manufacturing defects under normal operating conditions.

Q: Do you offer seal kits and spare parts?

A: Yes. We offer cylinder block, piston+slipper sets, valve plate, seal kits, and bearing kits for all A2FO sizes. See Related Parts section.