Shimadzu SGP2 SGP2B Gear Pump Replacement | SGP2B36 SGP1-30 Hydraulic Pump

Genlu Hydraulic excels as a world-class engineered component manufacturer, metallurgical expert, and strategic B2B global supplier of high-capacity, heavy-duty industrial external hydraulic gear pumps and related fluid components. The SGP1 and SGP2 Series Heavy-Duty High-Pressure Cast-Iron Hydraulic Gear Pump platform (encompassing SGP2, SGP2A, SGP2B, SGP2Z, and SGP1 frameworks) is purpose-built as a robust, high-volumetric-efficiency, and 100% drop-in interchangeable alternative to the definitive global industrial benchmark—the Japanese Shimadzu definitive SGP collections. We manage highly calibrated flexible production schedules and maintain deep ready-to-ship inventory for field configurations most requested by construction machinery fleets, notably including SGP2B36F1H1-LXXX, SGP2B36-R557, SGP1-30, SGP1-30.8, and SGP1-31.9.

Operating as the primary power muscle for heavy industrial forklift mast lifting, mini-excavator main circuits, loader wheel steering actuators, and municipal environmental truck manifolds, a heavy-duty gear pump must withstand continuous pressure cycling (up to 250 bar) and harsh ambient dust without fading. Genlu’s SGP series pumps align flawlessly with original Shimadzu manufacturing criteria. We guarantee absolute drop-in mechanical interchangeability across specific Japanese style or global SAE 2-bolt/4-bolt mounting patterns, primary splined/keyed drive shaft options, fluid port center-to-center alignments, and the high-density three-piece cast-iron body framework. Prior to shipment release, every single gear pump undergoes 100% Full-Simulation Condition Testing on digitized diagnostic benches to certify continuous volumetric displacement stability and strict low-noise compliance under maximum pressure ratings.

Technical Specifications 

• Product Line: SGP1, SGP2 Series External High-Pressure Cast-Iron Hydraulic Gear Pump (Fully cross-compatible with Shimadzu standards)

• Core Covered Specific Configurations:

  • SGP2B36F1H1-LXXX / SGP2B36-R557 Model Layouts (SGP2B frame size, 36 nominal displacement code, H1 high-pressure rating, customized F1/R557 shaft index, L/R rotational allocation)

  • SGP1-30 / SGP1-30.8 / SGP1-31.9 Model Layouts (SGP1 high-pressure compact frame size, corresponding to 30.0 to 31.9 displacement variants)

• Geometric Displacement Metric Groupings:

  • SGP1-30 Variant: 30.0 $cc/rev$

  • SGP1-30.8 Variant: 30.8 $cc/rev$

  • SGP1-31.9 Variant: 31.9 $cc/rev$

  • SGP2-36 Variant: 36.0 $cc/rev$ (Full customized scaling available across all SGP1/SGP2 frame envelopes)

• Continuous Rated Operating Pressure: Rated up to 206 bar (20.6 MPa / 3000 psi) continuous loading

• Maximum Intermittent Peak Pressure: Up to 245 bar (24.5 MPa / 3550 psi) handling transient severe system shocks

• Permissible Driving Rotational Velocity Envelope: From 2500 rpm up to 3000 rpm depending on target displacement code

• Minimum Startup Velocity Threshold: 500 rpm (Minimum speed needed to establish self-priming intake vacuum)

• Drive Shaft & Mounting Flange Configurations: Precision 13-tooth / 9-tooth Japanese style involute splined or straight keyed profiles paired with standard 2-bolt diamond mounting interfaces

• Rotational Direction Suffixes: R (Clockwise rotation when viewed looking directly at the drive shaft end); L (Counter-Clockwise rotation variant)

• Main Housing Metallurgy Construction: High-tensile, monolithic three-piece compact ductile/compacted graphite cast-iron structure (Cast-Iron Body)

Key Technical Advantages:

• Heavy-Duty Three-Piece Cast-Iron Body to Eliminate Structural Distortion: Unlike common lightweight aluminum-bodied pumps, the SGP series front cover, gear housing, and rear cover are cast from premium-grade ductile iron. This heavy-duty metallurgical composition delivers exceptional rigidity, ensuring the internal gear chamber will not experience micro-scale “swelling” deformation under continuous 245 bar spikes. This eliminates the risk of casing blowouts and premature internal leakage common in aluminum alternatives.

• Floating Balance Side Plates for Automatic Axial Clearance Compensation: The internal rotating group is bordered by premium bronze-alloy floating balance plates. High-pressure control fluid is internally routed via precise backing seals behind these plates, creating a hydrostatic bias force that keeps them pressed flat against the gear faces. This self-compensating mechanism maintains micron-level end-play clearances over tens of thousands of service hours, keeping volumetric efficiency above 95%.

• Heavy-Load DU Bushings for Full-Time Hydrodynamic Lubrication: The gear shaft journals are supported by robust, maintenance-free DU composite sleeve bearings. Integrated internal fluid paths direct continuous system return oil across the sleeves, keeping them fully lubricated. This design significantly lowers dry friction wear caused by asymmetric radial forces under high pressures, extending component life under high-speed operation.

• Precision Shaved Gears for Drastically Lower Fluid Pulsation Noise: The primary gear shafts are forged from high-tensile alloy steel and finished with a multi-axis CNC shaving and polishing process. This strict geometric tolerance ensures near-perfect gear tooth mesh, minimizing fluid trapping and lowering low-frequency fluid-borne pulsations. Total operating noise under full load is held below 70 dB, providing smooth system operation.

Application Areas:

• Material Handling Vehicles & Logistics Forklifts: Main mast lifting and power steering loops for Toyota, Komatsu, TCM, and Nichiyu 2-to-3.5 ton internal combustion and electric forklifts.

• Compact Excavators & Construction Machinery: Pilot pressure supply lines and auxiliary multi-spool valve feeds for mini-excavators, compact track loaders, and small bulldozers.

• Municipal Environmental Fleets & Utility Cranes: Primary packing cylinder power for refuse compaction trucks, hydraulic recovery roll-backs, and truck-mounted utility cranes.

Expert Maintenance Tips:

• Strictly Verify Rotation Suffixes (L vs. R) to Prevent Shaft Seal Blowouts: Shimadzu SGP codes (such as the L or R modifiers in SGP2B36F1H1-LXXX) specify the exact rotational direction required by the drive motor or engine PTO. L designates counter-clockwise and R designates clockwise. If a pump is installed with reversed rotation, the suction port will instantly act as a high-pressure discharge outlet, overpressuring and blowing out the lip shaft seal, which can lead to rapid core seizure.

• Maintain Reliable Suction Line Sealing to Avoid Cavitation Erosion: While the cast-iron body of SGP1/SGP2 pumps offers excellent durability, any air intrusion from an aged suction flange gasket or a restricted intake filter can cause excessive vacuum (never exceed -0.3 bar). This induces severe “cavitation,” marked by an unmistakable sharp metallic rattling sound. As the air bubbles implode in the high-pressure zone, they can pit the cast-iron walls and destroy the internal micron-scale tolerances.

• Enforce Rigorous Fluid Cleanliness Controls to Protect Internal Clearances: While cast-iron gear pumps show higher contaminant tolerance than piston units, the clearance between the floating side plates and gear faces is minimal. Coarse metallic debris in the oil can score these plates, creating internal leak paths that reduce pressure performance. Maintain hydraulic oil filtration to a minimum ISO 4406 20/17 or NAS 9 standard, and replace the system return filters whenever a new pump is commissioned.