WP09A1B160R03BA121N Replacement High Pressure Hydraulic Gear Pump

The WP09A1, WP09A2, and WP09A4 series high-performance external hydraulic gear pumps manufactured by LIC Hydraulic (encompassing standard industry designation 1802023, alongside core specific codes such as WP09A1B160R03BA121N, WP09A1V1, WP09A1V2, WP09A2B0, and WP09A4B1) are precision rotary fluid power components configured to deliver continuous high-pressure supply for compact hydraulic power packs, material handling vehicle systems, truck tail lifts, and industrial automation control loops. Matching standard mounting pilot metrics (such as international mini 2-bolt formats), input drive shaft options (including standard tang drive, keyed, or tapered shafts), port thread sizing definitions, and displacement pressure curves, this entire product family delivers 100% drop-in interchangeability with standard industrial WP09A series gear pump layouts.

To address the severe volumetric efficiency losses and excessive heat build-up that standard micro gear pumps undergo under continuous high workloads, LIC incorporates an autonomous hydrostatically-balanced axial gap compensation floating bushing architecture. Every single unit across our WP09A platform undergoes 100% full-load simulated high-pressure operational factory testing before dispatch. Maintaining exceptional volumetric retention under a continuous 25 MPa profile with minimized flow pulsations, low structural noise, and superior shock immunity, our pumps offer an optimal global procurement solution for international OEMs, power pack manufacturers, and distributors.

Technical Specifications

Accurate, catalog-verified technical engineering parameters for the WP09A series configurations:

Model: WP09A1B160R03BA121N (Core Representative Configuration)

• Product Series: WP09A Heavy-Duty Industrial Micro Gear Pump Line (Generation 1 Design)

• Global Interchange Code: 1802023

• Nominal Displacement: 1.60 cm³/rev

• Continuous Operating Pressure Limit: 25 MPa (250 bar / 3625 psi)

• Intermittent Peak Operating Pressure: 28 MPa (280 bar / 4060 psi)

• Maximum Continuous Rotational Speed: 3500 rpm

• Minimum Allowable Operating Speed: 600 rpm

• Input Drive Shaft Type (121N Code): Standard high-tensile tang drive shaft (spade type interface) or designated tapered profile

• Flange & Porting Geometry (BA/R03): Micro power pack specific 2-bolt mounting flange layout, paired with rear-facing or radial standard threaded port pathways (G3/8″ or SAE standard)

• Rotation Trajectory (R): Clockwise (CW, viewed directly from the input drive shaft end)

Series Variations & Derivative Models Overview:

• WP09A1V1 / WP09A1V2: Featuring integrated custom pump covers that encapsulate a built-in relief valve or check valve assembly, designed specifically for space-restricted hydraulic lifting and gravity-lowering power pack configurations.

• WP09A2B0 / WP09A4B1: Denoting variation parameters in mounting pilot recess depths, bolt hole spacing scales, and front outboard bearing configurations to interface flawlessly with diverse AC or DC electric motor faceplates.

Key Technical Advantages

• Hydrostatically Balanced Floating Bushings for Axial Clearance Compensation: The internal gear flanks are enveloped by precision-finished floating thrust bushes made of a proprietary wear-resistant aluminum alloy. Driven by internal oil pathways that route high-pressure system fluid behind the plates, the bushings automatically maintain microfilm contact with the gear faces. This self-compensating layout completely seals off lateral fluid bypass under full 25 MPa pressures, holding volumetric efficiency steady above 93%.

• Micro-Finished Monoblock Forged Gear-Shaft Assembly: Both driver and driven gear elements are precision-forged as solid monoblocks from premium structural alloy steel (e.g., 20CrMnTi), followed by carburizing case-hardening and ultra-precise CNC tooth profile grinding. This micrometer-level gear mesh geometry ensures fluid-tight engagement at 3500 rpm, radically flattening internal fluid trapping pulsations and lowering mechanical vibration noise.

• High-Density High-Tensile Extruded Aluminum Alloy Casing: The outer pump housing is machined from high-grade extruded aluminum material possessing dense micro-crystalline structures. This robust composition ensures the pump body suffers no structural micro-radial expansion or casing deflection when exposed to continuous peak loading or system pressure spikes, securing the shaft seals from failure.

• Heavy-Duty DU Composite Bearings with Forced Lubrication Channels: The gear shaft assemblies are supported by high-load capacity DU composite sleeve bushings that possess exceptional load-carrying traits and high resistance to dry friction. Paired with internal cooling oil recalculation pathways, hydraulic fluid is continually forced across the bearing clearances to evacuate thermal energy, preventing shaft galling during rapid electric motor start-stop cycles.

Application Areas

The WP09A series high-pressure micro gear pumps excel in space-restricted environments demanding high pressure-retaining thresholds and absolute reliability:

• Compact AC & DC Hydraulic Power Packs (Mini HPUs): Powering automotive scissor lifts, dock levelers, warehouse stacker trucks, and portable aerial aerial platform power units.

• Specialized Truck Liftgate Mechanisms: Serving as the primary high-pressure hydraulic supply pump for commercial delivery box-truck tail lifts and wing-body truck opening assemblies.

• CNC Machine Tool Workholding Circuits: Supplying steady pressure for automated hydraulic chuck clamping lines, rapid tool-changer locks, and indexing fixture manifolds.

• Medical & Plant Automation Hardware: Operating high-pressure micro cylinders on electro-hydraulic surgical beds, automated dental treatment chairs, and specialized industrial refuse compactors.

Expert Maintenance Tips

• Mandatory Fluid Pre-Filling & Manual Shaft Priming: Internal micro-clearances within the WP09A assembly are extremely close. Prior to firing up a newly installed unit (such as a replacement for 1802023), fill the gear chamber entirely with clean anti-wear hydraulic oil through the inlet port and manually rotate the input drive shaft several times. Operating dry will score the internal aluminum floating bushings within the first few seconds of motor engagement, causing permanent volumetric degradation.

• Enforce Strict Limits on Tang Drive Coupling Axial Clearances: For pumps utilizing a tang drive (spade shaft) configuration, verify that there is a calibrated axial clearance (typically 0.5–1.0 mm) between the pump spade end and the motor coupling slot. Never force them together tightly. Any continuous axial load or thrust thrusting into the pump will force the gear faces against the floating bushings, leading to rapid frictional damage and structural failure.

• Protect Micro Clearances via Rigorous Fluid Contamination Management: Because micro gear pumps are highly vulnerable to hard microscopic particulate matter, abrasive debris traversing the mesh will quickly scratch the floating bushes, leading to permanent internal bypassing. Maintain fluid cleanliness parameters strictly to ISO 4406 19/16/13 or cleaner. Ensure the suction line is completely airtight; vacuum leaks release dissolved air into bubbles that collapse under pressure, resulting in cavitation pitting along the aluminum casing walls.