Shimadzu SGP1 SGP2 Hydraulic Gear Pump | High Pressure Forklift Oil Pump SGP1-36D2H1-L

Genlu Hydraulic specializes in engineering fluid power systems for off-highway industrial utility vehicles and material handling fleets. We proudly present our high-pressure external SGP1 / SGP2 Series (comprehensively covering 16, 18, 20, 23, 25, 27, 30, 32, 34, and 36 cc/rev displacement nodes) hydraulic gear oil pumps, purpose-built for premium forklift primary mast hoisting, tilting, and hydrostatic power steering circuits. This series is fully engineered to meet global industrial standards and offers a seamless, high-value drop-in replacement for Shimadzu (SGP) original equipment installed across major forklift brands including Heli, Hangcha, Toyota, and Linde, explicitly targeting the high-frequency replacement model SGP1-36D2H1-L. The integrated technical alphanumeric string explicitly governs the chassis envelope: D2 declares the structural mounting flange matrix, H1 specifies the standard straight keyed or splined output shaft profile, and L establishes the Counter-Clockwise rotation limit (with Clockwise R configurations available).

During material handling cycles, rapid multi-spool directional valve actuations and overloading subject the primary forklift pump to intense, cyclical fluid shocks. This series features a premium three-piece floating thrust plate structure with automatic pressure balance compensation to withstand localized thermal expansion and pressure spikes. Genlu guarantees 100% Drop-in Interchangeability across standard mounting pilots, input spline splats, and port centerlines (flanged split configurations or threaded ports) compared to original Shimadzu assemblies. Every single forklift main pump undergoes a rigorous 100% automated inspection testing protocol under full mast-lift loads on our digital benches, certifying optimal volumetric retention, low cross-port internal leakage, and quiet operation under heavy utility duties.

Technical Specifications 

• Product Series: Shimadzu SGP1, SGP2 Series Material Handling Machinery High Pressure Hydraulic Gear Pump

• Core Model Target Profiles: SGP1-16, SGP1-18, SGP1-20, SGP1-23, SGP1-25, SGP1-27, SGP1-30, SGP1-32, SGP1-34, SGP1-36 (Primary configuration: SGP1-36D2H1-L)

• Geometric Displacement Profiles:

  • SGP1-16 Variant: $16.0 \text{ ml/r}$

  • SGP1-25 Variant: $25.0 \text{ ml/r}$

  • SGP1-36 Variant: $36.0 \text{ ml/r}$

• Nominal Operating Pressure Scale: 20.0 MPa to 24.5 MPa (200 – 245 bar / 2900 – 3550 psi, dependent on chamber displacement)

• Peak Transient Proof Pressure Limit: 28.0 MPa (280 bar / 4060 psi) (Safeguards internal chassis during sudden relief valve cracking)

• Permissible Operational Speed Scale: $500 \text{ rpm}$ up to $3000 \text{ rpm}$ (Synchronized with mobile diesel PTOs and electric motor speed curves)

• Standard Rotational Boundaries:

  • Code L: Counter-Clockwise (Left-hand rotation when viewed from the drive shaft profile)

  • Code R: Clockwise (Right-hand rotation when viewed from the drive shaft profile)

• Output Drive Shaft Styles: Standard straight parallel keyway, tapered shaft with key, rectangular straight spline, or SAE involute spline

• Gross Volumetric Efficiency Bound: $\ge 94\%$ under nominal full-load and full-speed forklift mast test criteria

• Approximate Frame Assembly Weight: $3.5 \text{ kg} – 5.8 \text{ kg}$

Key Technical Advantages:

• Three-Piece Flexible Aluminum-Alloy Axial Balance Thrust Plates: The internal drive core utilizes a floating “3-shaped” thrust plate array backed by premium, high-resilience elastomer profile seals. As lift pressures surge when handling maximum cargo, a fraction of the high-pressure fluid is channeled behind the plates. This hydrostatically forces them against the gear faces, sealing running clearances and preventing internal drift or mast creeping under heavy load conditions.

• Advanced Micro-Shaved Gear Profile & Anti-Trapping Grooves: The drive and driven gear sets are precision-cut using high-precision micro-shaving equipment to ensure low surface roughness. Computer-optimized fluid relief grooves channel trapped fluid back to the low-pressure suction side, eliminating intense trapped-volume pulsations. This design substantially reduces fluid-borne noise throughout the truck’s mast assembly.

• Tri-Metal PTFE-Infused Heavy Load Bearings: Moving away from standard steel bushings vulnerable to high-temperature scoring, the gear journals run in advanced multi-layer sleeves. Comprising a steel back, a sintered bronze middle matrix, and a PTFE/lead overlay, this design ensures smooth self-lubricating actions even when hydraulic oil viscosity drops during long summer shifts, preventing shaft seizure.

• Dual-Lip High-Pressure Reinforced Shaft Seal System: The front output shaft is fitted with a premium high-pressure resilient dual-lip skeleton shaft seal backed by an internal oil return gallery linked directly to the intake port. This path relieves high pressure from system return backshocks, protecting the shaft seal and blocking ambient air from contaminating the fluid loop.

Application Areas:

• Internal Combustion & Electric Counterbalanced Forklifts: Primary work group pumps for 1.5-ton to 5-ton warehouse forklifts (actuating main mast lift cylinders and tilt cylinders).

• Specialized Material Handling Fleet Vehicles: Auxiliary steering and pilot assist control blocks for reach trucks, high-capacity order pickers, and container reach stackers.

Expert Maintenance Tips:

• Enforce Strict Rotation Matching Protocols; Never Mount an Opposing Shaft Rotation Unit: The SGP1-36D2H1-L configuration requires a counter-clockwise (L) input drive. Before installing the pump, verify the rotation direction of the forklift’s engine or motor Power Take-Off (PTO) shaft. Forcing a left-hand (L) pump onto a right-hand turning drive will reverse the internal suction and discharge ports, blowing out the shaft seal instantly and destroying the internal components.

• Pre-Fill the Pump Housing with Clean Oil Prior to Initial Key-On Ignition: The internal running clearances of the gear pump rely on a continuous film of hydraulic oil for both lubrication and sealing. Before spinning the pump under starter motor power, fill the housing with clean oil through the intake port and rotate the shaft by hand. Starting the unit completely dry will cause immediate friction scoring between the gear faces and the floating plates, ruining the pump within seconds.

• Maintain Rigid Filtration Overhaul Windows and Inspect the Suction Hose for Structural Collapse: Forklift fleets often operate in dusty industrial environments. Replace the system filters every 1,000 hours or at the first sign of mast shuddering. Additionally, inspect the large-diameter rubber suction line; if this hose softens and collapses under high vacuum, it will starve the pump of oil, triggering severe cavitation that will cause rapid internal failure.