QX6262-80-80-S1361 Bucher Double Gear Pump 250Bar

Product Overview

The QX6262-80-80-S1361 is a premium double internal gear pump engineered specifically for heavy-duty industrial hydraulic systems that demand ultimate silent operation and high-pressure stability. Deeply benchmarked against the flagship Bucher Hydraulics QX series, this unit utilizes a single drive shaft to power two independent, large-displacement (80 cc/rev) internal gear assemblies, delivering smooth, pulsation-free dual hydraulic flow. Positioned as a high-end replacement solution for industrial B2B clients, its core competitive advantage lies in Absolute Interchangeability. Customers can seamlessly replace original Bucher pumps without modifying flange standards, specific shaft dimensions (S1361 custom designation), or port orientations. To back our commitment to uncompromising reliability, every single QX series double pump undergoes 100% simulated load testing on automated test rigs before leaving the factory. This guarantees leak-free, whisper-quiet, and stable hydraulic power under continuous high-pressure operations, ultimately optimizing procurement and maintenance budgets.

Technical Specifications 

• Model Code: QX6262-80-80-S1361 (Double Internal Gear Pump)

• OEM Compatibility: 100% drop-in replacement for the Bucher Hydraulics QX62 double pump series

• Displacement Configuration: Front Section: 80.0 cc/rev; Rear Section: 80.0 cc/rev (Total 160 cc/rev)

• Rated Continuous Pressure: 250 bar (3,600 psi)

• Peak Intermittent Pressure: 300 bar (4,350 psi)

• Operating Speed Range: 500 rpm to 3,000 rpm

• Control Method: Fixed displacement, open-loop circuit supply

• Fluid Pulsation: Extremely low (due to long internal gear meshing arc)

• Mounting Standard: Conforms to S1361 specific shaft and flange configurations

• Housing Material: High-strength special cast iron for maximum pressure and fatigue resistance

Key Technical Advantages

• Ultra-Quiet Internal Gear Operation: Featuring an internal gear design with a minimal tooth difference, the fluid transfer process is exceptionally smooth with uniform volumetric changes. Compared to external gear pumps, it exhibits negligible fluid pulsation, reducing airborne mechanical noise by typically 10-15 dB(A)—making it the ideal choice for indoor, noise-restricted hydraulic power units.

• Seamless Drop-in Replacement: Tailored to the specific S1361 designation, we have precisely reverse-engineered the flange, shaft extension, and port alignments to a 1:1 ratio. During major overhauls or aftermarket service, clients benefit from plug-and-play installation without the need for adapter kits or piping modifications.

• Superior Anti-Cavitation & Extended Lifespan: The non-compensated internal design, paired with hydrodynamic journal bearings, maintains outstanding cavitation resistance even at high speeds and pressure differentials. The rotors are fully supported by a fluid lubricating film, preventing metal-to-metal contact and significantly extending the pump’s service life.

• Rigorous 100% Simulated Load Testing: We reject random batch sampling. Every manufactured double pump is subjected to full rated pressure loads, peak pressure shocks, and thermal cycle monitoring. This totally eradicates out-of-box failures and guarantees that volumetric efficiency strictly meets operational requirements.

Application Areas

Due to its dual independent output and exceptionally low noise profile, the QX6262-80-80-S1361 is perfectly suited for stationary industrial machinery requiring high-pressure, large-flow, and noise-controlled operations:

• Metal Forming Equipment: Main drive circuits for large CNC press brakes, shearing machines, and stamping presses.

• Plastics Machinery: Dual-circuit power sources for clamping and injection functions in precision injection molding machines.

• Industrial Automation: Heavy-duty multi-station Hydraulic Power Units (HPUs), servo-hydraulic stations, and die-casting machines.

Expert Maintenance Tips

• Critical Suction Port Sizing: With a massive combined displacement of 160 cc/rev, this double pump demands substantial fluid intake. The suction piping must have a sufficient internal diameter to keep fluid velocity between 1.0 and 1.2 m/s. Prior to initial startup, manually prime the pump casing with clean oil to absolutely prevent catastrophic dry-running cavitation.

• Fluid Cleanliness and Viscosity: Internal gear pumps are sensitive to particulate contamination. Maintain a return line filtration level of ISO 4406 18/16/13 and keep operating fluid viscosity between 20 and 100 cSt at working temperatures to ensure optimal hydrodynamic bearing lubrication.

• Precision Shaft Alignment: When connecting to the primary electric motor, a high-quality flexible coupling is mandatory. Ensure the radial runout and angular misalignment are kept strictly within a 0.1mm tolerance to avoid inducing side loads that lead to premature shaft seal leaks or bearing failure.