| Parameter | Specification |
|---|---|
| Product Name | Komatsu Hydraulic Main Pump Assembly / Tandem Piston Pump |
| Part Number | 707-52-11010 |
| Brand | COGENG (Premium Aftermarket Replacement) |
| Condition | Brand New / Remanufactured Option Available — 100% Performance Tested |
| Pump Type | Swash Plate Type Axial Piston Pump, Tandem Configuration (Main + Auxiliary Section) |
| Compatible Equipment | Komatsu Hydraulic Excavators and Wheel Loaders (Model Verification Required by Serial Number) |
| Construction | High-Strength Cast Iron Pump Housing; Heat-Treated Alloy Steel Swash Plate; Bronze Piston Shoes; Hardened Steel Piston Assemblies; Precision Ground Cylinder Block |
| Displacement | OEM-Specified Displacement per Model Application (Typically Ranges 80-160 cc/rev per Section) |
| Maximum Operating Pressure | 34.3 MPa (350 bar / 5,000 psi) Main Relief Setting; 38 MPa Peak Allowable |
| Rated Speed | OEM-Specified Maximum Input Speed (Typically 2,200-2,600 RPM, Model Dependent) |
| Hydraulic Fluid Compatibility | Mineral-Based Hydraulic Oil, Synthetic Hydraulic Oil, Biodegradable Hydraulic Fluid (Per Komatsu Specification) |
| Filtration Requirement | ISO 4406 18/15 or Better Recommended for Maximum Service Life |
| Quality Assurance | 100% Dynamometer Tested — Flow, Pressure, Volumetric Efficiency, and Noise Level Verification; Internal Component Inspection Under 10x Magnification |
| Certification | ISO 9001 Certified Manufacturing Facility |
| Place of Origin | Guangdong, China |
| Supply Capacity | 100 Pieces per Month |
| Shipping Weight | 85 – 120 kg (Gross, Model Dependent) |
| Package Dimensions | 80 x 60 x 50 cm (Heavy-Duty Crating) |
| Packing | Inner: VCI Anti-Corrosion Bag; Outer: Reinforced Export-Grade Wooden Crate with Steel Banding, Silica Gel Desiccant Packs |
| Payment Terms | Western Union, L/C, T/T, MoneyGram |
| Shipping Mode | By Air, By Sea, By Express |
| Minimum Order Quantity | Acceptable Trial Order |
| Return Policy | Non-Returnable / Non-Exchangeable (Performance Guarantee Included) |
The COGENG Hydraulic Main Pump Assembly, part number 707-52-11010, is a precision-engineered, heavy-duty tandem axial piston pump designed as a direct, form-fit-function replacement for the core hydraulic power generation system on a wide range of Komatsu construction and mining equipment. This component is the heart of the machine's hydraulic system—the primary device responsible for converting mechanical rotational energy from the diesel engine into the high-pressure hydraulic fluid flow that powers every implement function: boom lift, arm crowd, bucket curl, swing rotation, travel drive, and auxiliary attachment operation.
This pump is configured as a tandem assembly, meaning it consists of two independent swash-plate type axial piston pump sections mounted within a single, integrated housing and driven by a common input shaft. This architecture allows the machine's hydraulic system to be divided into separate circuits—typically one pump section dedicated to the implement hydraulic system (boom, arm, bucket) and the second section dedicated to the swing circuit, travel circuit, or a combined auxiliary circuit. This separation of circuits provides several critical operational advantages: independent pressure and flow control for each circuit, reduced hydraulic horsepower waste during combined operations, improved fine control precision, and enhanced system reliability through redundancy. The pump incorporates a variable displacement mechanism controlled by a swash plate whose angle is continuously adjusted by hydraulic servo pistons in response to pilot pressure signals from the machine's load-sensing or negative flow control system. This allows the pump to deliver only the precise flow required by the current operating demand, minimizing engine fuel consumption and reducing system heat generation.
The operating environment for a main hydraulic pump is the most severe of any component on the machine. The pump must generate and withstand continuous internal pressures exceeding 30 MPa, with pulsations and transient pressure spikes that can approach 40 MPa during rapid valve shifting or when a loaded cylinder reaches the end of its stroke. The internal components—piston shoes, cylinder block, valve plate, and swash plate—are subjected to continuous metal-to-metal sliding contact under high load, requiring precision manufacturing tolerances and advanced surface treatments to achieve acceptable service life. The pump housing is exposed to the full engine bay environment: high ambient temperatures, continuous vibration, abrasive dust, and potential impact from debris. COGENG's 707-52-11010 pump is manufactured using premium materials and processes: high-strength cast iron housing for structural rigidity and noise damping; heat-treated alloy steel swash plate with a precisely ground, hardened surface; bronze piston shoes with a proprietary spherical bearing surface treatment for optimal load distribution; and a precision-ground cylinder block with matched piston bores. Every pump undergoes a complete dynamometer test protocol before shipment, verifying rated flow output, maximum pressure capability, volumetric efficiency, and noise characteristics against OEM specifications.
The 707-52-11010 pump is used across a range of Komatsu equipment. Specific model verification is mandatory.
| Brand | Typical Model Applications | Machine Type |
|---|---|---|
| Komatsu | Multiple Dash-6 / Dash-7 / Dash-8 Series | Hydraulic Excavators, Wheel Loaders |
Note: To confirm exact compatibility with your specific machine, please provide the complete machine serial number and, if possible, a photo of the old pump's identification plate.
Complete Main Pump Assembly (1 unit): The fully assembled tandem axial piston pump, including both pump sections, common inlet, separate outlet ports, servo control regulators, and input shaft.
Pre-Installed Input Shaft Seal: New OEM-specification high-pressure input shaft seal installed to prevent engine-to-pump oil leakage.
Pre-Installed O-Rings and Gaskets: All external sealing elements required for mounting and plumbing connections.
Protective Port Plugs: Plastic or metal caps installed on all inlet, outlet, and drain ports to prevent contamination ingress during shipping and handling.
VCI Anti-Corrosion Bag and Wooden Crate: The pump is sealed in a Vapor Corrosion Inhibitor (VCI) bag to protect internal and external surfaces from rust, then packed in a reinforced export-grade wooden crate with steel banding.
Note: The following describes accompanying high-resolution product photographs.
Image 1: Complete Pump Assembly — Isometric View
This photograph shows the entire 707-52-11010 tandem pump from a three-quarter angle. The image displays the main pump body with its two distinct section housings, the common input shaft at the rear with its splined or keyed coupling, the multiple high-pressure outlet ports, the servo control regulator assemblies, and the overall robust cast iron construction.
Image 2: Input Shaft and Mounting Flange — Detail
A close-up view of the pump's input end, showing the precision-ground input shaft with its splined coupling, the SAE or OEM-standard mounting flange, and the pre-installed input shaft seal.
Image 3: Servo Control Regulator — Detail
A detailed image of one of the pump's hydraulic servo control regulator assemblies. This component receives pilot pressure signals and precisely adjusts the swash plate angle to control pump displacement.
Image 4: Port Identification and Markings
A photograph showing the pump's identification plate and port markings, including the laser-etched or stamped part number 707-52-11010, the inlet and outlet port designations, and the COGENG brand logo.
Serial Number Verification is Mandatory: The 707-52-11010 pump may be used on multiple Komatsu models with different displacement configurations. Always provide your machine's complete serial number for exact verification.
Pump Displacement Matching: This pump is manufactured to specific displacement values per section. Incorrect displacement can result in reduced performance or system over-speed.
Professional Installation Required: Installation requires specialized knowledge of hydraulic systems, including proper alignment, flushing, and bleeding procedures.
Hydraulic Oil Cleanliness: Before installing the new pump, the entire hydraulic system should be thoroughly flushed and the hydraulic filters replaced.
Step 1: System Preparation
Park the machine on level ground. Lower all attachments. Stop the engine and allow it to cool. Thoroughly clean the area around the old pump to prevent dirt ingress.
Step 2: Old Pump Removal
Drain the hydraulic tank. Disconnect all hydraulic lines from the old pump, immediately capping or plugging all open line ends. Disconnect the pump from the engine flywheel housing or drive coupling. Carefully remove the old pump using an appropriate lifting device.
Step 3: New Pump Preparation
Carefully inspect the new COGENG pump for any signs of shipping damage. Remove all protective port plugs. Compare the new pump's physical dimensions, mounting flange, input shaft, and port locations to the old pump to confirm correct fitment.
Step 4: Installation
Install the new pump onto the engine flywheel housing or drive coupling, ensuring proper alignment. Torque all mounting bolts to OEM specifications. Reconnect all hydraulic lines using new, lubricated O-rings. Torque all fittings to OEM specifications.
Step 5: System Flushing and Start-Up
Refill the hydraulic tank with clean hydraulic oil. Replace all hydraulic filters. Disconnect the engine start circuit and crank the engine without starting to prime the pump with oil. Reconnect the start circuit. Start the engine and allow it to idle. Check for leaks. Cycle all hydraulic functions slowly and completely to purge air from the system. Monitor pump noise and temperature. Verify correct system pressure using a calibrated gauge.
| Detail | Description |
|---|---|
| Shipping Methods | By Air (for urgent orders), By Sea (bulk), By Express (DHL, FedEx, TNT) |
| Estimated Delivery Time | Based on carrier. |
| Packing | VCI Bag + Wooden Crate with Steel Banding |
| Payment Terms | T/T, L/C, Western Union, MoneyGram |
| Return Policy | Non-Returnable / Non-Exchangeable (DOA Guarantee Included) |
For pricing, compatibility verification, or technical support, contact your COGENG supplier today.
✅ Direct OEM Replacement — Dyno Tested for Guaranteed Performance.
✅ Severe-Duty Construction — Built for Extreme Hydraulic System Demands.
✅ In Stock — Ready for Immediate Worldwide Dispatch.
Critical Action: Please provide your machine model, serial number, and a photo of the old pump's identification plate for 100% compatibility confirmation before ordering.
Merchant Return Policy: All products are not returnable or exchangeable. Please verify compatibility before purchase.
*shipping Details Return Sales*
Sales price:
Please contact COGENG sales customer service for specific prices.
Shipping method:
The specific arrangement will be based on the cargo situation.
Estimated delivery time:
It is based on the shipping time of the logistics company, and the arrival time shown shall prevail.
Contact details are at the bottom.
MerchantReturnPolicy:
The products shipped are not returnable or exchangeable.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
