A11VO75LRDS/10R-NZD12K02
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Product details
Rexroth A11VO75LRDS/10R-NZD12K02 Full Specification Explanation
I. Breakdown of Model Code (Bosch Rexroth Original Axial Piston Variable Pump for Open Circuit)
Complete model segmentation: A11VO - 75 - LRDS /10R - NZD12K02
1. A11VO (Main Series Classification)
- A: Axial piston design
- 11: 11th generation heavy-duty pump for construction machinery
- V: Variable displacement design
- O: Designed exclusively for open hydraulic circuits (no built-in charge pump)
Distinction: A11VLO comes with an integrated charge pump for closed circuits; this A11VO model is solely for open circuit applications.
2. 75 (Nominal Displacement)
Maximum displacement: 75 cm³/rev (75cc/rev), with stepless adjustable displacement ranging from 0 to 75cc. Widely used as the main pump for 8-ton mini excavators, wheeled excavators and small loaders.
3. LRDS (Core Control Configuration, Critical for Machine Performance)
- LR: Combined Load Sensing (LS) & Constant Power Control. The pump automatically reduces displacement under high load to maintain constant input power from the engine, preventing engine stall; it delivers low flow under no-load conditions to save fuel.
- D: Integrated high-pressure cut-off protection. When system pressure exceeds the preset threshold, pump displacement drops to zero instantly to unload pressure and realize overload protection.
- S: Equipped with mechanical maximum displacement limit screw. The maximum swashplate angle can be manually locked on-site to cap the maximum travel or working speed of the machine.
Summary: LRDS = 4-in-1 control including Load Sensing, Constant Power, Pressure Cut-off & Mechanical Displacement Limiting, the all-purpose standard control for construction machinery.
4. /10R (Series Version & Rotation Direction)
- 10: Series 10 main body structure version (universal housing compatible with 40/60/75/95 small-displacement models)
- R: Clockwise rotation when viewing from the drive shaft input end; L stands for counterclockwise rotation.
5. NZD12K02 (Configuration Code for Mounting, Shaft Extension, Port Layout & Seals)
- N: SAE J744 4-bolt round flange mounting (industry standard flange for construction machinery)
- Z: Involute splined drive shaft (ANSI standard spline, compatible with transfer cases and couplings)
- D: Opposed side arrangement of high and low pressure ports with metric threaded ports
- 12: Universal cast valve body housing code
- K02: Fitted with standard NBR nitrile rubber seals (compatible with conventional mineral hydraulic oil HLP32/46); no swashplate angle indicator or speed sensor equipped, standard OEM base configuration.
II. Key Standard Technical Parameters
1. Pressure Rating: Continuous working pressure 350 bar (35 MPa), peak instantaneous shock pressure 400 bar (40 MPa)
2. Rotational Speed: Rated operating speed 2200 r/min; maximum limiting speed 3000 r/min; minimum self-priming speed 800 r/min
3. Flow Rate: Approx. 189 L/min maximum output flow at 2500 r/min full displacement
4. Compatible Fluid: ISO VG32 / VG46 mineral hydraulic oil; operating temperature range -20℃ ~ +85℃
5. Structure: 7-piston design with copper alloy cylinder block and hardened valve plate, highly resistant to dust and severe vibration working conditions
6. Net Weight: Approx. 72kg; full through-drive shaft design allowing rear-end tandem mounting of gear auxiliary pumps
III. Operating Principle of LRDS Control System
1. No-load & Light Load: LS load sensing detects low load pressure, pump outputs reduced flow for energy conservation.
2. Medium Load Operation: Constant power control activates; displacement decreases automatically as pressure rises to keep input power stable within engine rated power.
3. Stalling & Overload Condition: Pressure reaches cut-off setting, function D triggers, displacement drops to zero for pressure relief to protect the pump and mechanical components.
4. Speed Regulation: Tighten the S limit screw to lock maximum displacement and restrict machine working speed.
IV. Typical Application Scenarios
Main hydraulic pump for 8-ton mini excavators, wheeled excavators, small loaders, asphalt pavers, road rollers, truck-mounted cranes, small mobile crushing plants and engineering hydraulic power units.
V. Differentiation of Easily Confused Models
1. A11VO75LRDS vs A11VO75LRD: LRD version excludes the S mechanical limit and cannot restrict maximum flow manually; this LRDS model features the adjustable limit screw.
2. A11VO (without charge pump) ≠ A11VLO (with built-in charge pump), non-interchangeable in direct replacement.
3. OEM Part Number: This model corresponds to Rexroth original part codes in the R9022351XX series, available for checking OEM drawings and spare parts.
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