Shimadzu SGP1 SGP2 Forklift Gear Pump | SGP1A25F2H9-L282C SGP1A32 Hydraulic Pump

The SGP1 and SGP2 Series high-pressure hydraulic gear pumps manufactured by Chengyuan Hydraulic are premium fluid power components engineered to match global Shimadzu industrial standards. Celebrated as the primary hydraulic heart managing lifting masts and steering torque assist setups across premier global forklift networks—including Toyota, Komatsu, Mitsubishi, Nichiyu, Heli, and Hangcha—this heavy-duty series delivers flawless system longevity. The comprehensive platform natively covers precise catalog configurations including the specialized valve-integrated variant SGP1A25F2H9-L282C, the standard high-pressure single unit SGP1A25F2H9, the high-flow network SGP1A27A2H9, and the reinforced drive configuration SGP1A32R212. Engineered with a hydrostatically balanced floating thrust plate matrix enclosed within a high-density anti-creep cast aluminum housing, these pumps withstand severe intermittent pressure spikes. Every singular SGP1A and SGP2A pump undergoes 100% simulated load testing for full-rated forklift mast lifting strains, thermal bypass retention at low velocities, and input shaft radial load deflection prior to packaging to ensure matching performance metrics, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: Shimadzu SGP1 / SGP1A / SGP2 / SGP2A Template Heavy-Duty Forklift Gear Pumps

• Model Configurations Supported: SGP1A25F2H9-L282C / SGP1A25F2H9 / SGP1A27A2H9 / SGP1A32R212

• Geometric Volumetric Displacement Codings:

  • Profile A25: Nominal volumetric displacement of 25.0 $cm^3/rev$

  • Profile A27: Nominal volumetric displacement of 27.0 $cm^3/rev$

  • Profile A32: Nominal volumetric displacement of 32.0 $cm^3/rev$

• Nominal Operating Pressure Rating (Code H9 / R212 Platforms): 20.6 MPa to 24.5 MPa (206 bar ~ 245 bar / 3553 psi)

• Intermittent Peak System Pressure Cap: Reaches up to 27.5 MPa (275 bar / 3988 psi)

• Permissible Rotational Input Velocity Range: 500 rpm to 3000 rpm (perfectly tuned to track forklift engine sweeps from idle to peak throttle inputs)

• Drive Shaft Extension & Mounting Flange Layouts:

  • Code F2/A2 Shaft Matrix: Standard forklift-specific involute splines (e.g., 10-tooth or 13-tooth grids) or specialized tang-drive keyed extensions

  • Code H9 Flange Matrix: Shimadzu standard 2-bolt universal rhomboid mounting interface (strictly tailored to exact forklift chassis blueprints)

• Integrated Valve Block Mechanics (Suffix L282C): Onboard proportional safety relief valve and priority flow-divider block, continuously optimizing priority routing to the steering circuit while feeding remainder flows to the mast lift cylinders.

Key Technical Advantages:

• High-Tensile Anti-Creep Aluminum Monoblock Frame: The central pump body is cast from specialized structural aluminum alloy utilizing high-density gravity-chill molds. This lightweight architecture drastically trims front-end mass to optimize forklift counterweight distribution, while its dense crystalline structure resists mechanical breathing or micro-expansion under a constant 24.5 MPa load, completely eliminating inter-chamber cross-port fluid pressure loss.

• Hydrostatically Balanced Floating Thrust Plates with “M”-Profile Sealing: The internal core features premium wear-resistant copper-alloy floating thrust plates backed by high-resilience “M”-shaped elastomer load seals. Channeling downstream high pressure discharge oil to back-bias the plates against the gear faces, the pump provides active end-face clearance closed-loop compensation, locking volumetric efficiency above 94% across extended thermal shifts.

• Super-Finished Involute Gearing with Anti-Trapped Oil Relieving Notches: Forged from top-grade Ni-Cr alloy steel, the gear sets undergo deep case-hardening, quenching, and sub-micron grinding to achieve a hardness of HRC 62. The thrust plates feature symmetrical triangular relief notches that vent trapped oil pressure pockets during gear mesh, suppressing high-pressure fluid pulsations and anchoring operational noise below 65 dB(A).

• Heavy-Duty DU Journal Bearings paired with High-Thermal Double-Lip Shaft Seals: The drive assembly discards failure-prone needle bearings for premium self-lubricating DU composite journal liners. These liners feature exceptional shock-load resistance, effortlessly absorbing the severe radial offset stresses transmitted by engine direct gear trains or belt drives. Paired with a forward high-temperature double-lip viton shaft seal, it guarantees leak-free shaft rotation under fluctuating thermal and pressure cycles.

Application Areas:

• Counterbalanced Internal Combustion & Electric Forklifts: Main hydraulic lifting and power steering prime mover for 2.5-ton, 3-ton, 3.5-ton, and 5-ton forklift fleets (e.g., Toyota 8FD and Komatsu -17/-21 models).

• High-Reach Logistics & Warehouse Stacking Machinery: Central hydraulic power units for multi-directional stand-up reach trucks and heavy electric walkie straddle stackers.

• Specialty Mobile Equipment & Sanitation Attachments: Compact skid-steer loader attachments, airport baggage tow tractors, and aerial work platform hydraulic lifters.

Expert Maintenance Tips:

• Enforce Rigorous Shaft Rotation Direction Matching: Shimadzu SGP1 series gear pumps are built with strict single-direction flow characteristics (clearly designated via Clockwise “R” or Counter-Clockwise “L” serial codes). Cross-check the forklift engine PTO output rotation before seating the pump; driving the shaft in reverse will immediately blow out the low-pressure shaft seal via high-pressure oil backflow, destroying the internal floating plate array within seconds.

• Mandatory Cavity Fluid Priming to Prevent Dry Friction Scuffing: After replacing a forklift main pump, large pockets of air fill the suction lines. You must fill the new pump cavity with clean hydraulic oil through the ports and index the input shaft 3 turns by hand before tightening the line fittings. For the first engine start, run the engine at a low idle using short jog cranks (Start-Stop method) until all suction line air bleeds off, preventing immediate dry running damage.

• Regular Priority-Valve Calibration and Flow-Setting Audits: For models integrating control valves like the L282C suffix, an onboard priority valve manages the steering fluid balance. If the forklift experiences stiff or heavy steering controls or slow mast lifting, never force engine throttle. Connect a pressure gauge to audit the integrated relief valve crack-pressure settings, which may drift due to spring fatigue. Clean the internal micro-orifices to clear particulate blockages that cause high fluid temperatures.