Product Overview
The SDY1A3612L573 is a tandem gear pump from Japan’s SHIMADZU SDY Series. Founded in 1875, SHIMADZU is a globally renowned manufacturer of precision instruments and hydraulic components. The SDY Series tandem gear pumps are purpose-built hydraulic power units for forklifts, wheel loaders, and construction machinery.
The SDY Series features tandem (dual-section) gear pump construction, integrating two independent gear sections in a single housing to deliver two independent hydraulic outputs from a single drive shaft input. The SDY1A3612L573 belongs to the SDY1 Series, with the front pump from the SGP1 Series (36 cm³/rev displacement) and the rear pump from the YP15 Series (12 cm³/rev displacement). The front pump features a cast iron housing, while the rear pump features an aluminum housing.
Key Interchangeability Advantage: Our SDY series tandem gear pumps are manufactured to strict Japanese SHIMADZU original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces, flange dimensions, shaft configurations, and port positions are identical to the original product – directly replacing original pumps on TCM, Toyota, Nissan, Mitsubishi forklifts and loaders with no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on SHIMADZU SDY Series designation rules):
SDY = Series: Tandem Gear Pump
1 = Sub-series: SDY1 (front pump SGP1, rear pump YP15)
A = Flange pilot / mounting configuration code
36 = Front pump displacement: 36 cm³/rev (SGP1 Series)
12 = Rear pump displacement: 12 cm³/rev (YP15 Series)
L573 = Design number / specific configuration code
Technical Specifications
SDY1A3612L573
Product Series: SHIMADZU SDY1 Series Tandem Gear Pump
Brand: SHIMADZU (Japan)
Pump Type: Tandem External Gear Pump
Front Pump Displacement (SGP1 Series): 36 cm³/rev
Rear Pump Displacement (YP15 Series): 12 cm³/rev
Front Pump Rated Pressure: 20.6 MPa (206 bar)
Rear Pump Rated Pressure: 20.6 MPa (206 bar)
Front Pump Maximum Pressure: 24.5 MPa (245 bar) (intermittent)
Front Pump Housing Material: Cast iron
Rear Pump Housing Material: Aluminum alloy
Maximum Speed: 3000 – 3500 rpm
Recommended Fluid: Mineral hydraulic oil
Operating Temperature Range: -20°C to +80°C
Mounting: Flange mounting
Typical Applications: Forklifts, wheel loaders, construction machinery
Key Technical Advantages
1. Tandem Integrated Design for Independent Dual-Circuit Output
The SDY Series integrates SGP1 and YP15 gear sections in a single housing, driven by a single input shaft to simultaneously power the front and rear pumps – independently supplying oil to the working attachment (e.g., forklift mast lift) and steering/auxiliary systems. This design dramatically simplifies hydraulic piping layout on forklifts and loaders, reducing external connection points and leakage risks.
2. Excellent Durability – Validated by One Million Impact Fatigue Tests
SHIMADZU gear pumps have passed one million impact fatigue tests at 24.5 MPa. This rigorous testing verifies product reliability under long-term high-pressure impact conditions, ensuring extended service life across various demanding applications.
3. Cast Iron + Aluminum Hybrid Housing – Lightweight with High Strength
The SDY1 Series features a cast iron front pump housing (for high-load applications) and an aluminum rear pump housing (for lightweight design). This optimized material combination delivers substantial weight reduction while maintaining structural integrity – particularly critical for weight-sensitive mobile equipment like forklifts.
4. High Efficiency – High Volumetric and Mechanical Efficiency
Through precise and detailed design, SHIMADZU gear pumps maintain high volumetric efficiency and high mechanical efficiency. Optimized gear meshing and precision machining effectively minimize internal leakage and mechanical friction losses, ensuring stable and efficient hydraulic power output under all operating conditions.
5. Broad Compatibility Coverage
The SDY Series tandem pumps are widely compatible with TCM, Toyota, Nissan, Mitsubishi forklifts and loaders. As a flagship model of the SDY1 Series, the SDY1A3612L573 is one of the most widely used replacement pump solutions for forklift hydraulic systems.
Application Areas
Forklift Hydraulic Systems: TCM, Toyota, Nissan, Mitsubishi forklift mast lift, tilt, and steering hydraulic systems
Wheel Loaders: Small to medium wheel loader implement hydraulic systems
Construction Equipment: Excavator, bulldozer, and other construction machinery hydraulic systems
Industrial Vehicles: Hydraulic drive systems for various industrial vehicles
Agricultural Machinery: Agricultural, forestry, and fishery machinery hydraulic systems
Material Handling Equipment: Crane and material handling equipment hydraulic systems
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete SDY1A3612L573 model breakdown: SDY (tandem series), 1 (SDY1 sub-series), A (mounting configuration), 36 (front pump 36 cc/rev), 12 (rear pump 12 cc/rev), L573 (design number).
Front pump: SGP1 Series (displacement 16–36 cc/rev); rear pump: YP15 Series (displacement 5–16 cc/rev).
Verify system operating pressure (≤ 20.6 MPa), front/rear displacement requirements, and rotation direction during selection.
2. Pre-Installation Checks
SDY Series pumps have a fixed rotation direction (left-hand or right-hand) – verify matches system drive direction before installation.
Confirm mounting flange type and drive shaft specifications precisely match system interface.
Never use hammer-driven installation – always use proper tools.
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled – never run dry.
Recommended fluid: ISO VG 32–46 anti-wear hydraulic oil.
Maintain operating temperature within -20°C to +80°C.
Maximum speed: 3000 – 3500 rpm.
4. Filtration & Fluid Cleanliness
5. Operating Monitoring
Front and rear pump continuous operating pressure must not exceed 20.6 MPa (206 bar) ; peak pressure must not exceed 24.5 MPa (245 bar) .
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
