PHS3031-2519AGL SDY1-27.5F2H2-L896 SGP1-18F2H2-L10 Shimadzu Gear Pump

Product Overview

The PHS3031-2519AGL, SDY1-27.5F2H2-L896, and SGP1-18F2H2-L10 are high-pressure external gear pumps from two established Japanese product lines: the MITSUBOSHI (formerly NABCO) PHS tandem series and the SHIMADZU SGP1/SDY single-and-combination series. All three models operate at a 20.6 MPa rated pressure class with a 24.5 MPa peak pressure rating, making them suitable for mobile crane hydraulics, construction equipment, industrial power units, and auxiliary circuits requiring compact, durable flow sources.

The PHS3031-2519AGL is a MITSUBOSHI PHS-series tandem gear pump with approximately 31 cm³/rev on the first stage and 25.19 cm³/rev on the second stage. It is widely specified on Kobelco, Tadano, and IHI crane hydraulic systems. The SDY1-27.5F2H2-L896 is a SHIMADZU SDY1 combination pump pairing an SGP1-series 27.8 cm³/rev cast-iron high-pressure section with a YP15 aluminum-body auxiliary section, ideal for machines that need independent pilot or lubrication flow alongside main working pressure. The SGP1-18F2H2-L10 is an SGP1 single-stage unit delivering 18.3 cm³/rev from a cast-iron body with aluminum front/rear covers, G-thread ports, 2-bolt horizontal flange mounting, SAE spline shaft, and CCW rotation.

These units are offered as compatible replacements designed for interchangeability with the original models. Each pump is manufactured to OEM interface dimensions and undergoes 100% simulated operating-condition bench testing before shipment, verifying volumetric efficiency, seal integrity, and stable output across the rated pressure-speed envelope.

Technical Specifications

PHS3031-2519AGL (MITSUBOSHI / NABCO PHS-Series Tandem Gear Pump)

• Brand / Series: MITSUBOSHI (formerly NABCO), PHS high-pressure tandem gear pump series

• Model Code: PHS3031-2519AGL

• Pump Architecture: External gear, tandem (series-connected) configuration

• Stage 1 Theoretical Displacement: approx. 31 cm³/rev (indicated by “31” in model code)

• Stage 2 Theoretical Displacement: approx. 25.19 cm³/rev (indicated by “2519” in model code)

• Rated Pressure: Not confirmed in official documentation for this exact variant (series-level reference: 20.6–24.5 MPa)

• Peak Pressure: 24.5 MPa (245 bar, 3553 psi) (confirmed at series level)

• Speed Range: Not confirmed in official documentation for this exact variant

• Rotation / Shaft: Not confirmed (refer to suffix AGL detail drawing)

• Mounting: Not confirmed in official documentation for this exact variant

• Typical Application Hosts: Kobelco, Tadano, IHI crane hydraulic systems

• Weight: Not confirmed in official documentation

SDY1-27.5F2H2-L896 (Shimadzu SDY1-Series Combination Pump)

• Brand / Series: Shimadzu, SDY1 combination (dual) pump series

• Model Code: SDY1-27.5F2H2-L896

• Pump Architecture: Stage 1: SGP1 high-pressure gear pump; Stage 2: YP15 auxiliary gear pump

• Stage 1 Displacement: 27.8 cm³/rev (1.696 in³/rev)

• Stage 2 Displacement Range: 5–16 cm³/rev (YP15 series; exact value per order code)

• Rated Pressure (Stage 1 SGP1): 20.6 MPa (206 bar, 2987 psi)

• Peak Pressure: 24.5 MPa (245 bar, 3553 psi)

• Speed Range: 400–3,500 min⁻¹

• Allowable Inlet Pressure: -0.02 to +0.2 MPa (-2.9 to +29 psi)

• Stage 1 Body Material: Cast iron (FC)

• Stage 2 Body Material: Aluminum alloy

• Port Type: F2 = G-thread ports (rear-cover side)

• Mounting: H = 2-bolt horizontal flange

• Shaft: 2 = SAE spline (10-tooth or 13-tooth per drawing)

• Rotation: L = Counter-Clockwise (CCW when viewed from shaft end)

• Overall Dimensions: L1 = 114.8 mm, L2 = 142.3 mm, L3 = 73.5 mm

• Option Code: -L896 (3-figure configuration code)

SGP1-18F2H2-L10 (Shimadzu SGP1-Series Single-Stage Gear Pump)

• Brand / Series: Shimadzu, SGP1 high-pressure gear pump (cast-iron body)

• Model Code: SGP1-18F2H2-L10

• Pump Architecture: External gear, single-stage, axial clearance auto-compensated, radially hydraulically balanced

• Theoretical Displacement: 18.3 cm³/rev (1.116 in³/rev)

• Rated Pressure: 20.6 MPa (206 bar, 2987 psi)

• Peak Pressure: 24.5 MPa (245 bar, 3553 psi)

• Minimum Speed: 500 min⁻¹

• Maximum Speed: 4,000 min⁻¹

• Allowable Inlet Pressure: -0.02 to +0.2 MPa (-2.9 to +29 psi)

• Weight: 3.4 kg (7.48 lb)

• Front/Rear Cover Material: Aluminum alloy die-cast

• Body Material: Cast iron

• Gear / Side Plate / Bush Material: Alloy steel / Special alloy steel / Special alloy steel

• Port Type: F2 = G-thread ports on rear cover

• Mounting: H = 2-bolt horizontal flange (pilot diameter φ82₋₀.₀₉₀⁻₀.₀₃₆ mm)

• Shaft: 2 = SAE 10-tooth spline (13-tooth available per configuration)

• Rotation: L = Counter-Clockwise (CCW viewed from shaft end)

• Option Code: -L10 (3-figure configuration code)

• Seal Material: Nitrile rubber (NBR)

Key Technical Advantages

1. Validated High-Pressure Fatigue Resistance: Both the PHS and SGP1/SDY families have undergone one million pressure-impact fatigue cycles at 24.5 MPa, confirming structural integrity of the gear set, bearings, and side plates under cyclic loading. This matters directly for crane luffing, hoist, and boom-extension circuits where pressure spikes occur repeatedly each work cycle.

1. Axial Clearance Auto-Compensation with Hydraulic Radial Balance: The SGP1 series uses a three-section body architecture (aluminum front cover + cast iron center section + aluminum rear cover). Bushings incorporate DU self-lubricating liners; side plates are bimetallic. A pressure-loaded compensation chamber behind each side plate maintains optimal axial clearance across the entire pressure band, stabilizing volumetric efficiency from idle to full load. The radial bearing zone employs hydraulic balance design to reduce bearing load and extend service life.

1. Wide Speed-Range Flexibility: The SGP1-18 operates from 500 to 4,000 min⁻¹; the SDY1-27.5 front section covers 400–3,500 min⁻¹. The low end ensures stable output during engine idle or fine-positioning maneuvers; the high end delivers maximum flow at rated power. This bandwidth allows a single pump frame to serve multiple prime-mover ratings without re-selection.

1. Drop-In Interchangeability: All three models are machined to original mounting-flange dimensions, port locations (G-thread or flange), shaft specifications (SAE spline), and rotation direction. Replacement requires no piping, coupling, or mounting modification, minimizing machine downtime. Interface benchmarking has been performed specifically for Kobelco/Tadano/IHI crane retrofit applications.

1. 100% Simulated Operating-Condition Bench Test: Every unit is tested at working pressure, speed, and temperature before shipment. Volumetric efficiency curves, pressure ripple, temperature rise, and noise data are recorded. Non-conforming units do not ship, ensuring bolt-on reliability upon receipt.

Application Areas

• Mobile cranes (Kobelco, Tadano, IHI, Kato, etc.): luffing, hoist, telescope, and swing circuit power source

• Mini excavators and track loaders: main pump or pilot supply pump

• Industrial hydraulic power units (HPUs): injection molding auxiliaries, clamping fixtures, presses

• Forklifts and aerial work platforms: lift and steering hydraulics

• Agricultural and forestry machinery: harvester and tractor hydraulic outlets

• Municipal sanitation vehicles: compaction and broom-drive actuators

• Marine deck machinery: winches, steering gear, boat davits

• Specialty transport vehicles: truck-mounted crane outriggers and boom functions

Expert Maintenance Tips

1. Fluid Cleanness Control: Maintain ISO 4406 cleanliness at 19/17/14 or better. Internal clearances in the SGP1/PHS series are on the order of micrometers under pressure; solid particulate contamination accelerates wear on side plates, bushings, and seal faces. Install a 10 μm return-line filter and monitor oil contamination at regular intervals.

1. Inlet Condition Management: Keep inlet vacuum above -0.02 MPa (approx. -2.9 psi). Use short, large-diameter suction lines; avoid long narrow hoses or undersized strainers at the inlet port. Entrained air (cavitation) will erode gear tooth faces and side plates, presenting as rising noise and increasing metallic debris in the oil sample.

1. Case Drain Back-Pressure Limit: If the pump housing has a case drain port, ensure return-line back-pressure stays below 0.2–0.3 MPa. Excessive back-pressure can force the oil-seal lip to invert, causing external leakage. For tandem pumps such as SDY1 and PHS3031, drain both stages separately or manifold them properly to prevent high-pressure stage back-flow into the low-pressure stage housing cavity.

1. Shaft Alignment and Coupling Selection: Use a flexible coupling on the SAE spline shaft. Keep angular misalignment within 0.5° and radial offset below 0.1 mm. Rigid coupling or excessive offset concentrates stress on spline teeth, leading to early fatigue spalling.

1. Cold-Start Warm-Up Procedure: When ambient temperature is below 5 °C, run the pump unloaded at 500–800 min⁻¹ for 5–10 minutes before applying load. Allow oil temperature to rise above 30 °C before ramping to working pressure. Rapid acceleration under cold, high-viscosity conditions sharply increases suction losses and accelerates wear.

1. Oil Change Intervals: For mineral-based hydraulic oil, change every 2,000–3,000 operating hours or once per year, whichever comes first. Synthetic fluid can extend this to 4,000–5,000 hours. Replace or clean suction and return filter elements at every oil change.