QT62-125F-BP-Z Sumitomo Internal Gear Pump 14MPa

Product Overview

• QT = Internal Gear Pump series
• 6 = Frame Size 6
• 2 = Medium pressure type (14 MPa rated)
• 125 = Theoretical displacement 125 cc/rev
• F = P2 port rotated 180° (tail-cover side pump P2 port at opposite position)
• BP-Z = Design number / special specification code

Technical Specifications (Bulleted List)

• Model: QT62-125F-BP-Z
• Theoretical Displacement: 125 cc/rev (ml/r)
• Rated Working Pressure: 14 MPa (140 bar / 140 kgf/cm²)
• Maximum Instantaneous Pressure: 16 MPa (160 bar / 160 kgf/cm²)
• Peak Pressure Definition: Maximum 1/3 of one duty cycle, continuous duration limited to 20 seconds
• Speed Range: 200 ~ 2,200 r/min
• Maximum Output Torque: 329.3 Nm (at maximum continuous allowable pressure, mineral oil medium)
• Drive Power (Theoretical): 51.7 kW (at 1,450 rpm, maximum continuous pressure, mineral oil)
• Drive Power at Rated Pressure: 45.4 kW (at 1,500 rpm, 14 MPa rated pressure)
• No-Load Flow (60Hz / 1,800 rpm): 223.8 L/min
• No-Load Flow (50Hz / 1,500 rpm): 186.4 L/min
• No-Load Flow (60Hz / 1,200 rpm): 149.0 L/min
• No-Load Flow (50Hz / 1,000 rpm): 124.1 L/min
• Maximum Noise Level: < 65 dB(A)
• Pressure Pulsation: Approximately 0.2 MPa (virtually imperceptible)
• Rotation: Standard clockwise (viewed from shaft end); F suffix = P2 port rotated 180°

• QT62-80: 80 cc/rev, max 2,200 rpm, 203.8 Nm, 33.5 kW
• QT62-100: 100 cc/rev, max 2,200 rpm, 267.5 Nm, 42.0 kW
• QT62-125: 125 cc/rev, max 2,200 rpm, 329.3 Nm, 51.7 kW

• Low-Pressure Platform (QT31/41/51/61): Rated 7 MPa, peak 8 MPa
• Medium-Pressure Platform (QT22/32/42/52/62): Rated 14 MPa, peak 16 MPa
• High-Pressure Platform (QT23/33/43/53/63): Rated 25 MPa, peak 32 MPa
• Ultra-High-Pressure Platform (QT24/34/44): Rated 31.4 MPa, peak 34.3 MPa

• Recommended Hydraulic Oil: ISO VG 46–68 anti-wear hydraulic oil
• Operating Viscosity Range: 20 ~ 500 cSt (mm²/s)
• Operating Temperature: 0°C ~ 60°C
• Suction Side Filtration: 150 μm
• Discharge Side Filtration: 25 μm (magnetic filter recommended)
• Suction Pressure Range: -0.3 kgf/cm² ~ +0.3 kgf/cm² (high-pressure seal required above +0.3 kgf/cm²)
• Mounting: Flange-mounted, suction port oriented sideways-upward
• Drive Connection: Elastic coupling or chain coupling only; eccentricity error ≤ 0.05 mm; belt/chain/gear side-drive strictly prohibited
• All pipe connections: Flanged type

• Flange A × B: 266 × 229
• Housing Height C: 23.0
• Shaft Center Height H: 95
• Shaft Diameter: Φ24
• Mounting Circle Diameter N: 152.4
• Number of Mounting Holes: 7
• Weight: Approximately 75 kg (QT62 series)

Key Technical Advantages

• Straight Conjugate Internal Gear Meshing Design: The QT series employs Sumitomo’s proprietary straight conjugate tooth profile, where the internal gear (driven) and external gear (driver) create multiple simultaneous meshing seal chambers with significantly higher contact ratio than conventional involute profiles. This fundamentally eliminates the trapped oil phenomenon , reducing pressure pulsation to merely ~0.2 MPa — virtually imperceptible pulsation output. This makes the QT pump the ideal power source for precision speed control systems, particularly in machine tools and test equipment demanding exceptional pressure stability.
• Forced Lubrication & Zero-Contact Wear Technology: The QT series’ unique forced lubrication system ensures all functional surfaces — gear end faces, side plates, and bearing surfaces — are continuously separated by a complete oil film during operation, achieving zero direct metal-to-metal contact between components. This means functional part wear is virtually nonexistent even at 250 bar with standard hydraulic oil. This design maintains volumetric efficiency of 93%–98% over the pump’s extended service life, far exceeding comparable external gear pump designs.
• Ultra-Low Noise with Full-Condition Stability: The QT series maintains maximum noise below 65 dB(A), with the critical advantage that noise levels remain virtually unchanged even as pressure or speed increases substantially. This is because the straight conjugate tooth geometry minimizes meshing volume variation and dramatically reduces meshing impact energy. The sound quality is smooth and pleasant, with operational noise nearly imperceptible — creating an exceptionally comfortable working environment while significantly reducing hydraulic line vibration and fatigue-related failures.
• Modular Multi-Pump Configuration Capability: The QT series supports flexible assembly of single pumps into duplex or multi-pump configurations via standardized connection kits, combining different pressure ratings and displacements on a common drive shaft. The same component platform can be configured for low-pressure (7 MPa), medium-pressure (14 MPa), or high-pressure (25 MPa) service. For example, the QT6252-100-63-BP-Z combines a QT62-100 front section (100 cc/rev for rapid mold closing/opening at high flow) with a QT52-63 rear section (63 cc/rev for precision pressure holding at low flow), with both sections capable of independent or combined operation.
• Wide Pressure Platform Coverage & Full Interchangeability: The QT series spans from 7 MPa low-pressure to 31.4 MPa ultra-high-pressure ratings, with different pressure grades sharing identical mounting dimensions and shaft specifications within the same frame size. Pressure rating upgrades require only a model suffix change — no foundation or piping modifications needed. The full series supports clockwise/counterclockwise rotation selection and 180° P2 port rotation, ensuring perfect piping alignment with any host equipment layout.

Application Areas

• Injection Molding Machines: Hydraulic power sources for mold clamping, injection carriage, and ejector mechanisms on Haitian, Sumitomo, FANUC, Toshiba, Mitsubishi, JSW, NISSEI, UBE, ENGEL, and ARBURG machines — particularly suited for servo-driven variable-displacement pump control systems
• Forging & Stamping Equipment: High-pressure hydraulic drives for shearing machines, press brakes, punch presses, and hydraulic presses
• Die-Casting Machines: Clamping and shot-end hydraulic systems for cold-chamber and hot-chamber die-casting equipment
• Precision Machine Tools: Hydraulic servo systems for grinding machines, machining centers, and CNC lathes requiring strict pressure pulsation and noise control
• Elevator Hydraulic Systems: Main pump drives for hydraulic elevators
• Rubber Processing Machinery: Hydraulic power for vulcanizing presses and internal mixers
• Engineered Wood Panel Processing: Hydraulic systems for particleboard and MDF hot-pressing equipment
• Test & Simulation Equipment: Precision hydraulic loading sources for material testing machines and fatigue test rigs
• Metallurgical Equipment: Hydraulic screw-down systems for rolling mills and continuous casting equipment

Expert Maintenance Tips

• Mandatory Pre-Start Priming & Air Bleeding: Before initial startup or after extended downtime, the QT pump must be filled with working oil through the suction port, and lubricating oil applied to all sliding surfaces. During startup, the pump must be in a depressurized state — repeatedly start and stop the pump to exhaust all air from the pump cavity and suction piping. Dry starting will cause irreversible damage to gear end faces and side plates within seconds.
• Fluid Cleanliness & Filtration Control: A 150 μm filter must be installed on the suction side, with a 25 μm precision filter recommended on the discharge side, supplemented by a magnetic filter to capture ferrous wear particles. Hydraulic oil must remain clean at all times — prevent contamination by foreign matter or water. If the oil shows discoloration, stratification, or white air bubble entrainment, the fluid has deteriorated and must be replaced immediately.
• Suction Line Integrity & Flow Velocity: Suction line diameter should be sized for flow velocity below 1.5 m/s, with negative pressure not exceeding -0.3 kgf/cm², and piping kept as short as possible. Loose fittings, aged/deformed suction hoses, or clogged strainers will cause flow starvation and cavitation damage. Suction pressure must remain within -0.3 to +0.3 kgf/cm²; if inlet pressure exceeds +0.3 kgf/cm², a high-pressure seal (H-suffix model) is required.
• Shaft Alignment & Drive Method Requirements: The connection between pump drive shaft and motor shaft must use an elastic coupling or chain coupling only, with eccentricity error strictly controlled to ≤ 0.05 mm. The pump drive shaft must not承受 any radial vertical load — belt, chain, or gear side-drive methods are strictly prohibited. The coupling should be freely assembleable on the pump shaft without excessive tightness. The mounting base must have sufficient rigidity.
• Maximum Pressure Usage Regulations: The QT pump’s peak instantaneous pressure (16 MPa for QT62 series) is subject to strict duty cycle limitations — peak pressure operation must not exceed 1/3 of one working cycle, with continuous duration limited to 20 seconds maximum. Exceeding these limits will accelerate functional component wear and reduce pump service life. System design should ensure the rated working pressure (14 MPa) covers the majority of operating time.
• Hydraulic Oil Selection & Viscosity Management: Use anti-wear hydraulic oil equivalent to ISO VG 46–68. Operating viscosity range is 20–500 cSt with operating temperature 0–60°C. If fire-resistant hydraulic fluids (water glycol, phosphate ester, W/O emulsion, etc.) are required, consult Sumitomo for compatible model specifications before use.