Rexroth AZPNF Double Gear Pump Replacement 0510765063 R902650748

Genlu Hydraulic stands as an elite-tier global developer and high-precision manufacturer of industrial and mobile-grade high-pressure hydraulic pumps, external external gear configurations, multi-stage tandem pump groups, and comprehensive fluid control manifolds for global B2B supply platforms. The AZPNF Series High-Performance External Double Gear Pump Line—engineered to deliver a premium 100% drop-in interchangeable alternative to the definitive high-pressure external multiple-pump machinery standard established by global fluid giant Bosch Rexroth (specifically matching performance codes like AZPNF-11-028/016RDC0720KB-S0023 [Material Number: 0510765063 / R902650748] and AZPNF-11-028/019LDC2020KB-S0052 [Material Number: 0510767315])—represents a highly optimized, dual-circuit fluid power solution. By pairing two independent gear rotating kits on a single high-torque drive shaft, this tandem series provides separate hydraulic fluid streams or combined high-volume delivery, widely specified across mobile truck cranes, excavator pilot/steering networks, plastic machinery, and industrial HPU systems.

Within complex dual-circuit configurations, multi-stage external gear pumps regularly confront massive asymmetric mechanical stresses generated by differing front and rear stage pressures. Specifically, when the front stage operates under a continuous 25 MPa load while the rear stage undergoes rapid intermittent valve shifting, the internal coupling shaft and cross-chamber barriers must withstand heavy torsional shearing and alternating fatigue stresses. Low-grade aftermarket alternative double pumps lacking precision-engineered center isolation zones or uniform shaft heat treatments succumb to fatal structural failure—including cross-chamber internal fluid blowby, middle drive-link fracture, and immediate front-shaft oil seal blowout. Genlu’s premium AZPNF series replacement pumps are reverse-engineered to copy the exact floating bushing hydrostatic balance mechanisms, heavy-duty DU bushing arrays, and high-fatigue aluminum housing tolerances specified in legacy Rexroth engineering documents. Whether validating standard European front-mounting configurations, standard straight-keyed or splined driveshafts, or specialized split flange port alignments, our pumps guarantee 100% mechanical and functional drop-in interchangeability. Prior to delivery, each tandem unit passes strict verification on our Dual-Load Automated Test Stands under Full-Simulation Conditions to evaluate independent stage performance, volumetric tracing, and zero-cross leak parameters, ensuring seamless synchronous action upon deployment.

Technical Specifications 

• Product Pump Classification: AZPNF Series High-Performance Tandem External High-Pressure Gear Pump Group

• Core Cross-Reference Model & Part Number Alignments:

  • Configuration A: AZPNF-11-028/016RDC0720KB-S0023 (Bosch Rexroth Code: 0510765063 / R902650748)

  • Configuration B: AZPNF-11-028/019LDC2020KB-S0052 (Bosch Rexroth Code: 0510767315)

• Geometric Displacement Combinations:

  • 0510765063 / R902650748: Front Stage 28 $cc/rev$ + Rear Stage 16 $cc/rev$

  • 0510767315: Front Stage 28 $cc/rev$ + Rear Stage 19 $cc/rev$

• Continuous Rated Operating Pressure Threshold: Both front and rear stages maintain a robust 25.0 MPa (250 bar / 3625 PSI) capacity under heavy-duty operations

• Maximum Permissible Transient Peak Pressure Overload: Up to 28.0 MPa (280 bar / 4060 PSI) during rapid spike absorption

• Drive Input Shaft Rotational Orientation Configuration:

  • RDC0720KB Profile: R — Right-Hand (Standard Clockwise, CW from shaft end perspective)

  • LDC2020KB Profile: L — Left-Hand (Counter-Clockwise, CCW to accommodate varying diesel engine/electric motor drive rotations)

• Drive Shaft Mechanical Connection Geometry: DC specification (precision heavy-duty cylindrical straight keyed or splined profile engineered to fit original coupling setups perfectly)

• Housing & Porting Structural Layout: High-strength, weight-optimized extruded anti-fatigue aluminum alloy body (Series 11 compact envelope) with standard split SAE flange or thread alignments

• Total Pump Assembly Net Dry Weight: Range spanning 8.8 kg — 10.5 kg (High power-density multi-stage profile)

Key Technical Advantages:

• Axial Hydrostatic Floating Sealing Control for Stable 93% Efficiency: Employs Rexroth’s proven pressure-loaded floating bushing method. By channeling high-pressure fluid behind the wear plates, the assembly maintains micron-level end-face contact against the gears. Even at 25 MPa under full unequal dual-stage loading, internal slip is minimized to keep volumetric efficiency over 93%.

• Heavy-Duty DU Bearings with Anti-Deflection Shafting: The gear sets are machined as single-piece shafts and paired with premium heavy-duty DU composite bushings (PTFE-bronze-steel backing). This rigid support counteracts the massive radial unbalanced forces caused by high hydraulic pressure, preventing localized fatigue or shaft deflection to more than double the wear life.

• Dual-Barrier Inter-Stage Isolation Against Internal Blowby: Features high-pressure Viton dual-lip seals and an internal relief pathway at the junction of the 28cc front stage and 16cc/19cc rear stages. This channel directs any micro-leakage back to the suction chamber, eliminating cross-chamber fluid migration and preventing high-pressure spikes from bursting the lower-pressure rear housing.

• CNC Profile-Ground Low-Noise Gear Mesh Geometry: The gear teeth are ground via multi-axis CNC profile grinders for microscopic tooth modification and paired with smooth unloading grooves. This geometry dampens fluid trapping and mesh shockwaves, keeping full-load operating noise under 68 dB(A) for smooth system operation.

Application Areas:

• Mobile Engineering Vehicles and Heavy Infrastructure Equipment: Powering upper-structure crane pilot/steering loops, concrete mixing trucks, and auxiliary compact excavator main circuits.

• Industrial HPUs and Multi-Circuit Manufacturing Systems: Supporting auxiliary plastic injection mold clamping, multi-station tooling machine feeds, and high-speed waste baling press cycles.

Expert Maintenance Tips:

• Mandatory Alignment Verification for Large Dual Intake Flanges: Regardless of right-hand (0510765063) or left-hand (0510767315) setups, port dimensions scale by displacement. You must verify that the 28cc front stage connects directly to the main high-volume reservoir suction line. Never reverse the connection during installation, as starving the larger stage causes rapid cavitation and destroys the pump within minutes.

• Enforced Pre-Priming and Manual Shaft Rotation Prior to Initial Commissioning: With two independent gear sets and longer internal passages, tandem pumps double the risk of dry running. Pre-fill the common suction port or individual discharge ports with clean hydraulic oil and turn the drive shaft manually to ensure the rear stage is fully coated. Jog the motor at zero pressure for 5 minutes to clear all air before increasing load.

• Strict Control Boundaries for Fluid Cleanliness and Operating Temperatures: Compact aluminum gear pumps are highly sensitive to hard particulate contamination. The hydraulic circuit must maintain a continuous filtration rating of $\le 10 \mu m$ (NAS Class 8 or cleaner). Keep operating temperatures under 60°C via heat exchangers, as excessive heat triggers thermal expansion that can cause gear scoring.