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705-51-20370
Green Hydraulic
705-51-20370
Standard export carton/plywood case
Yes
ISO9001，CE
• Industrial • Energy • Government (Non Aerospace) • HVAC • Mobile • Natural Resources • Transportation (Non Aerospace)
1. Industrial Hydraulic Systems 2. Mobile Equipment (Industrial Vehicles) 3. Construction and Engineering Machinery 4. Metallurgy Industry
Key Shaft and Spline shaft
1 set
Product Description
The the Komatsu 705-51-20370 is a heavy-duty, tandem external gear pump engineered for bulldozer and construction machinery hydraulic systems that demand reliable, dual-circuit power output under extreme operating conditions. Featuring a rugged cast iron construction and integrated dual-section design, this pump is purpose-built to deliver consistent hydraulic flow to both work and steering circuits, making it the ideal choice for direct engine PTO mounting in D65/D85 series bulldozers where durability and performance are critical.
Specifications
| Item | Specification |
| Structure | External meshing double gear pump |
| Displacement | 45+45 cc/rev |
| Rated Pressure | 21 MPa |
| Max Pressure | 25 MPa |
| Rated Speed | 1800 rpm |
| Max Speed | 2400 rpm |
| Rotation Direction | Clockwise (view from shaft end) |
| Drive Shaft | 13 teeth spline shaft |
| Installation Type | 4-hole flange mounting |
| Oil Port | 1 inlet, 2 outlets |
| Main Material | Cast iron housing, alloy steel gear |
| Net Weight | 17 kg |
| Interchangeable Part No. | 705-51-20830 |
Applications
Applications
Bulldozer Work Hydraulics: The primary power source for blade lifting, lowering, and tilting functions on Komatsu D65/D85 series bulldozers, delivering stable high-pressure flow to handle heavy loads and precise grading operations.
Steering & Pilot Control Systems: Supplies consistent, low-pressure oil to the steering and pilot control circuits, ensuring responsive and reliable maneuverability in both straight travel and articulated turns.
Construction Site Operations: Optimized for continuous use in rugged environments, including mining, road building, and land clearing, where dust, vibration, and thermal shock demand robust pump construction.
Heavy Equipment Retrofit & Maintenance: Widely used in equipment rebuilds and direct replacement applications, fully interchangeable with the 705-51-20830 part number for drop-in compatibility.
Multi-Function Mobile Hydraulics: Ideal for auxiliary circuits requiring dual independent flow streams, such as dozer ripper control, winch systems, and auxiliary attachment power on compatible Komatsu machinery.
Factory&FAQ
705-51-20370 pumps are typically packaged securely to prevent damage during transit. The packaging includes:
Protective Wrapping: To safeguard the pump from environmental damage.
Custom Crates: For larger, heavier pumps, ensuring safe handling.
Documentation: Includes installation, maintenance instructions, and warranty details.
Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.
Tandem Dual-Section Design: Unlike single pumps that only support one circuit, this model delivers two independent flows (45 cc/rev each) from a single drive shaft, powering both blade hydraulics and steering simultaneously.
Heavy-Duty Cast Iron Housing: Built to withstand high-pressure cycles and mechanical shock, the cast iron frame maintains tight internal clearances and prevents deformation, ensuring long service life under continuous load.
Engineered for Direct PTO Mount: The compact, OEM-specific flange and spline design eliminates the need for additional couplings, offering a drop-in fit for Komatsu engine PTO interfaces with minimal installation complexity.
The 705-51-20370 is optimized for bulldozer-grade high-pressure hydraulic systems. Its standard ratings are:
Continuous Operating Pressure: Up to 21 MPa (3,045 PSI).
Intermittent/Peak Pressure: Up to 25 MPa (3,625 PSI).
This robust pressure rating makes it ideal for powering high-force blade actuation and responsive steering circuits on heavy construction machinery.
Yes, the 705-51-20370 is a direct OEM replacement for the Komatsu part number 705-51-20830 and is used as a primary power source in compatible D65 and D85 series bulldozers. To ensure a successful swap, verify the following match your existing system:
Mounting Flange Pattern
Displacement (45 + 45 cc/rev tandem configuration)
Port Configuration (common suction, dual discharge)
To protect the precision gears, bearings, and seals, the following specifications are recommended:
Oil Type: Premium mineral-based anti-wear hydraulic fluids (ISO VG46 or equivalent) with robust anti-wear and anti-foam additives.
Viscosity: Optimal operating range: 20–30 cSt at 40°C (100–150 SUS). Cold start tolerance down to 430 cSt (2,000 SUS).
Filtration: A minimum cleanliness level of ISO 4406 18/16/13 is recommended to prevent abrasive contamination from damaging internal components.
The pump is calibrated for engine-driven applications, with a standard operating range of:
Rated Speed: 1,800 RPM
Maximum Continuous Speed: 2,400 RPM
Operating within this range ensures optimal volumetric efficiency and avoids excessive cavitation or wear during extended duty cycles.
Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.
Please provide the following details:
Model or displacement
Working pressure
Speed
Quantity
We will reply within 12 hours with a competitive quotation.
705-51-20370 pumps are manufactured in compliance with international standards, ensuring high performance and reliability:
ISO 9001: Certified for quality management systems.
CE Certification: Ensures compliance with European safety, health, and environmental protection standards.
RoHS Compliance: Ensures the pump does not contain hazardous materials.
Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.
1.What's our advantages?
Factory established in 2005;
With a great deal of production experience;
80+ employees become the professional team;
Constant updated ERP system ensure efficiency of work;
Sophisticated equipment ehanced the accuracy of products;
Professional salesmen provide the greast service;
With a large number of famous customers all over the world;
Great after-sales service;
With the long term cooperation with famous logistics and express company in China,provide the better goods service.
Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.
Of course we can. Just send me your logo we can make it for you.
America(40.5%):USA, Canada, Argentina, Brazil
Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.
Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.
Others(5.8%).
The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.
The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.
Green Hydraulic's manufacturing facilities for hydraulic pumps maintain stringent quality standards, often adhering to international certifications, to meet the expectations of customers in industries such as construction, agriculture, automotive, and manufacturing.
All hydraulic pumps produced by Green Hydraulic have undergone compliance testing, ensuring their quality and reliability.
To meet the diverse needs of different industries, the green hydraulic offer customization options, such as specialized seals, materials, and pump configurations. These facilities often work closely with engineering teams to develop tailored solutions for specific applications, from high-pressure systems to low-flow, high-efficiency pumps.
Each pump undergoes a rigorous quality control process, where pressure tests and performance assessments are conducted to ensure that the pumps meet the required standards for flow rate, pressure capacity, and durability.
