Product Overview
The AZPFF-11-016/011LRR2020KB is a high-performance external gear double pump from the Bosch Rexroth AZPF series, Platform F. This tandem pump configuration features a first-stage displacement of 16 cc/rev and a second-stage displacement of 11 cc/rev, totaling 27 cc/rev.
The AZPF series is one of the core product lines in the Rexroth external gear pump portfolio, alongside the B, F, N, and G series platforms. Platform F offers displacements ranging from 4 cc/rev to 28 cc/rev, engineered with plain slide bearings for heavy-load applications. The series is available in Standard, High-Performance, SILENCE, and SILENCE PLUS versions.
As a tandem pump, the AZPFF-11-016/011LRR2020KB features two pump stages driven by a common input shaft, enabling simultaneous oil supply to two independent hydraulic circuits or flow combination for greater total output. The pump fully complies with Rexroth original design standards and mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Complete Model Code Breakdown (Bulleted List) :
AZPFF — Series: External gear pump, Platform F, Tandem (double) pump configuration
11 — Size group: Platform F size 11 (medium-frame)
016 — First-stage displacement: 16 cc/rev
011 — Second-stage displacement: 11 cc/rev
LRR — Rotation and configuration: L = Left-hand (counter-clockwise), RR = both stages same left-hand rotation
2020KB — Flange, shaft, and port configuration code
S0081 — Special configuration suffix code
R918C02056 — Rexroth material number
Technical Specifications
Model: AZPFF-11-016/011LRR2020KB (with S0081 suffix / Material No. R918C02056)
Series: AZPF Platform F (Platform F) High-Performance External Gear Pump
Pump Type: Double Gear Pump (Zahnrad-Doppelpumpe)
First-Stage Displacement: 16 cc/rev
Second-Stage Displacement: 11 cc/rev
Total Displacement: 27 cc/rev
Rated Pressure (Continuous): Up to 250 bar
Intermittent Operating Pressure: Up to 280 bar (second stage) / 250 bar (first stage)
Peak Pressure (Transient): Up to 290 bar
Maximum Speed: 3000 rpm
Minimum Speed: 600 rpm
Rotation Direction: Left-hand (counter-clockwise)
Weight: Approx. 5.45 kg
Housing Material: Aluminum
Flange and Cover Material: Steel
Mounting Flange Diameter: 80 mm
Shaft Type: Tapered shaft 1:5
Seal Material: Viton (FKM)
Recommended Media: Mineral oil and synthetic hydraulic oils
Key Technical Advantages
1. Tandem Pump Design – One Pump, Two Circuits
The AZPFF-11-016/011LRR2020KB features a tandem pump configuration with two stages (16 cc/rev + 11 cc/rev) driven by a common input shaft, enabling simultaneous oil supply to two independent hydraulic circuits. This design significantly reduces the number of pumps required in the system, saves installation space, and lowers system complexity and cost. The two stages can operate independently or be combined for greater total flow output.
2. High-Pressure Capability for Heavy-Duty Applications
With a continuous rated pressure of up to 250 bar, intermittent pressure of up to 280 bar, and peak pressure of 290 bar, combined with plain slide bearings, the pump effectively withstands high hydraulic loads and axial/radial forces. It is ideally suited for heavy-load applications in construction and agricultural machinery.
3. Optimized Material Combination – Aluminum Housing with Steel Flange
The pump housing is manufactured from aluminum, effectively reducing overall weight (approx. 5.45 kg), while the flange and rear cover are made of steel, providing superior structural strength at critical load-bearing points. This material combination achieves an optimal balance between lightweight construction and structural rigidity.
4. High-Speed Capability with Wide Speed Range
With a maximum speed of 3000 rpm and minimum speed of 600 rpm, the wide speed range enables adaptation to various prime mover conditions—whether high-speed diesel engines or low-speed electric motor drives.
5. Modular Design for Flexible Configuration
The AZPF series adopts a modular design philosophy, supporting a wide range of displacement combinations, shaft types (tapered shaft 1:5), flange types, and port configurations. AZPFF tandem pumps can be flexibly combined with AZPF single pumps and additional stages to form multi-pump assemblies, meeting the diverse flow requirements of complex hydraulic systems.
6. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with Rexroth original design standards, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.
7. SILENCE Low-Noise Options Available
The AZPF series offers SILENCE and SILENCE PLUS low-noise versions, featuring optimized gear tooth geometry that effectively reduces operating noise—particularly suitable for applications with strict noise requirements.
Application Areas
The AZPFF-11-016/011LRR2020KB tandem gear pump is widely used in the hydraulic systems of the following equipment:
Wheel Loaders: Independent oil supply for steering systems and implement hydraulics
Backhoe Loaders: Dual-circuit oil supply for travel drive and implement functions
Telescopic Handlers: Dual-circuit oil supply for boom extension and load lifting
Agricultural Tractors: Independent oil supply for hydraulic outlets and steering systems
Dump Trucks: Oil supply for tipping systems and auxiliary hydraulic systems
Industrial Hydraulic Equipment: Multi-circuit hydraulic systems for injection molding machines, presses, and material handling equipment
Mobile Cranes: Dual-circuit oil supply for swing and luffing mechanisms
Expert Maintenance Tips
1. Rotation Direction Confirmation
The “L” in the model designation indicates left-hand (counter-clockwise) rotation. Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to gears and bearings within a short period.
2. Tandem Pump Installation Precautions
The two stages of the tandem pump share a common drive shaft—pay special attention to axial alignment accuracy during installation to avoid axial over-positioning that may cause bearing overload
Thoroughly clean the mounting flange and tapered shaft mating surfaces before installation to ensure no debris remains
Use Rexroth-specified torque values for mounting bolts—avoid over-tightening which may cause housing distortion
Ensure correct connection of inlet and outlet ports for both stages—do not interchange
3. First Start-Up and Bleeding
Before first start-up, fill both pump stages with hydraulic oil through their respective inlet ports—never start dry
After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from both stages and the system
Check both stages separately for abnormal noise or leakage
4. Fluid and Filtration
Use high-quality mineral hydraulic oil compliant with DIN 51524 standards
Maintain system oil cleanliness to ISO 4406 18/15 or better
Slide bearings are sensitive to fluid cleanliness—install a high-quality suction filter in the inlet line
Viton seals have specific temperature requirements—maintain within recommended operating range
5. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor operating pressure of both stages to ensure they do not exceed rated values
If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
Replace pump seals every 2,000–3,000 operating hours or based on actual operating conditions
