Product Overview
The SGP1 Series High-Pressure Gear Pumps are classic hydraulic power components developed by SHIMADZU for material handling equipment. Since its founding in 1875, Shimadzu has built deep technological expertise in analytical instruments, medical equipment, and aerospace machinery. The SGP1 series is one of the core hydraulic product lines from Shimadzu, widely used in forklifts, construction machinery, and agricultural equipment.
The SGP1 series features axial clearance automatic compensation and radial hydraulic balance in an external gear pump with a three-opening construction. The bushings are equipped with DU liners, the side plates are made of bimetallic material, and the pump body consists of aluminum alloy die-cast front and rear covers with a cast iron center section—effectively enhancing performance and reliability. With displacements ranging from 16 mL/r to 36 mL/r and a rated pressure of 20.6 MPa, the SGP1 series is the preferred choice for 1–3.5T electric forklifts.
SGP1-32F2H9-L318 model code breakdown:
SGP1: SGP1 Series
32: Pump size – 33.2 cm³/rev displacement
F: Port position – Rear cover side ports
2: Port configuration – G screw thread
H: Mounting method – Horizontal 2-bolt
9: Shaft end type – SAE spline shaft
L318: Rotation direction & code number – L = counter-clockwise viewed from shaft end
SGP1-36R114 model code breakdown:
SGP1-27-F1H2R model code breakdown:
SGP1: SGP1 Series
27: Pump size – 27.8 cm³/rev displacement
F: Port position – Rear cover side ports
1: Port configuration – Flange port
H: Mounting method – Horizontal 2-bolt
2: Shaft end type – SAE spline shaft
R: Rotation direction – Clockwise viewed from shaft end
We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. All SGP1 series models offer 100% direct interchangeability with original Shimadzu SGP1 series pumps of the same model—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.
Technical Specifications
SGP1 Series General Specifications:
Brand Series: SHIMADZU SGP1 Series
Pump Type: External gear pump (axial clearance compensation + radial hydraulic balance)
Construction: Three-opening construction
Body Material: Cast iron center section, aluminum alloy die-cast front/rear covers
Bushings: DU liners
Side Plates: Bimetallic material
Rated Pressure: 20.6 MPa (206 bar / 2987 psi)
Peak Pressure: 24.5 MPa (245 bar / 3553 psi)
Inlet Pressure: -0.02 ～ 0.2 MPa
Minimum Speed: 500 min⁻¹
Maximum Speed: 4000 min⁻¹
Fluid Media: Mineral hydraulic oil
SGP1-32F2H9-L318 Specifications:
Displacement: 33.2 cm³/rev (2.025 in³/rev)
Rated Pressure: 20.6 MPa (206 bar)
Peak Pressure: 24.5 MPa (245 bar)
Maximum Speed: 4000 min⁻¹
Minimum Speed: 500 min⁻¹
Mass: Approx. 4.2 kg
Rotation Direction: Counter-clockwise (L designation)
Port Position: Rear cover side ports (F designation)
Port Configuration: G screw thread (2 designation)
Mounting: Horizontal 2-bolt (H designation)
SGP1-36R114 Specifications:
Displacement: 36.6 cm³/rev (2.233 in³/rev)
Rated Pressure: 20.6 MPa (206 bar)
Peak Pressure: 24.5 MPa (245 bar)
Maximum Speed: 4000 min⁻¹
Minimum Speed: 500 min⁻¹
Mass: Approx. 4.5 kg
Rotation Direction: Clockwise (R designation)
SGP1-27-F1H2R Specifications:
Displacement: 27.8 cm³/rev (1.696 in³/rev)
Rated Pressure: 20.6 MPa (206 bar)
Peak Pressure: 24.5 MPa (245 bar)
Maximum Speed: 3500 min⁻¹
Minimum Speed: 400 min⁻¹
Mass: Approx. 4.0 kg
Rotation Direction: Clockwise (R designation)
Port Position: Rear cover side ports (F designation)
Port Configuration: Flange port (1 designation)
Mounting: Horizontal 2-bolt (H designation)
Key Technical Advantages
1. Exceptional Durability – One Million Cycle Impact Fatigue Test
SGP1 series gear pumps have passed one million cycle impact fatigue tests under 24.5 MPa high-pressure conditions. This rigorous durability testing fully demonstrates their long-term reliability in forklift applications with frequent start-stop cycles and severe load fluctuations.
2. Axial Clearance Compensation + Radial Hydraulic Balance – Guaranteed High Efficiency
The SGP1 series features axial clearance automatic compensation and radial hydraulic balance design. With precision-engineered construction, this series maintains high volumetric efficiency and high mechanical efficiency. The three-opening construction with DU liners and bimetallic side plates effectively minimizes internal leakage.
3. High-Strength Composite Pump Body – Lightweight with Durability
The SGP1 series features a composite pump body with a cast iron center section and aluminum alloy die-cast front/rear covers. This design achieves lightweight construction while maintaining structural strength, with the aluminum alloy body featuring high-precision styling and low noise. High-performance, wear-resistant bearings ensure reliable operation under high pressure and high speed.
4. Low-Noise Operation – Improves Operator Environment
The SGP1 series is renowned for low noise, smart structure, and easy installation. The low-noise characteristic significantly improves the forklift operator’s working environment, reducing fatigue during extended operation. Wide temperature range design ensures broad applicability across varying oil temperatures and speeds.
5. Broad OEM Interchangeability – Compatible with Major Forklift Brands
SGP1 series hydraulic gear pumps offer direct replacement for original Shimadzu equipment, widely used in 1–3.5T electric forklifts. Standard mounting flanges and SAE spline shafts ensure complete compatibility with original equipment. The SGP1 series can also be configured as double pumps for 50–100 HP wheeled tractor applications.
Application Areas
Electric Forklifts (1–3.5T)—hydraulic lift and steering systems
Internal Combustion Forklifts—hydraulic implement systems
Wheeled Tractors (50–100 HP)—double pump configurations
Construction Machinery—hydraulic systems for small construction equipment
Material Handling Equipment—hydraulic systems for various warehousing and handling equipment
Agricultural Machinery—hydraulic systems for agricultural, forestry, and fishery machinery
Industrial Vehicles—hydraulic systems for tow tractors, platform trucks, and other industrial vehicles
Expert Maintenance Tips
Model Code Verification (verify each element):
SGP1 series model codes contain critical information. Before selection and installation, confirm the following:
SGP1: Series number – SGP1 Series.
Second digits (16/18/20/23/25/27/30/32/34/36) : Pump size – corresponds to different displacements.
Port Position: F = Rear cover side ports, D = Rear ports.
Port Configuration: 1 = Flange port (sides only), 2 = G screw thread.
Mounting: H = Horizontal 2-bolt.
Shaft End: 1 = SAE spline 13 teeth, 5 = SAE spline 10 teeth.
Rotation Direction: L = Counter-clockwise viewed from shaft end, R = Clockwise viewed from shaft end.
Code Number: Last three digits.
Verify Rotation Direction:
Confirm that the drive shaft rotation matches the direction code in the model – “L” indicates counter-clockwise, “R” indicates clockwise. Incorrect rotation will prevent pressure build-up and may damage internal gears and bearings.
Mounting Flange and Drive Shaft Matching:
SGP1 series mounting pilot diameter is φ82.55 (A-type). Verify that the equipment-side flange type and shaft specification match the pump configuration before installation. SGP1 series offers SAE 13-tooth or 10-tooth spline shaft options.
Suction Line and Inlet Pressure Requirements:
SGP1 series requires an inlet pressure range of -0.02 ～ 0.2 MPa. Ensure the suction line is properly sealed with no air leaks and the suction filter is not clogged. Use mineral hydraulic oil meeting ISO/DIN standards.
First-Start Priming Procedure:
After new pump installation or system overhaul, ensure the pump cavity is filled with oil before first start. Jog the pump at low speed and low pressure until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed and working pressure. Running the pump dry will cause irreversible damage to gears and bearings.
Oil Cleanliness and Regular Maintenance:
Replace hydraulic oil and return filters every 1,000 operating hours or per equipment manufacturer recommendations. Using hydraulic oil with proper cleanliness will significantly extend pump service life. Regularly monitor pump body temperature—if it consistently exceeds +80°C, inspect the system cooling.
