| Parameter | Specification |
|---|---|
| Product Name | Komatsu Hydraulic Pump Regulator Assembly / Servo Piston Control Unit |
| Part Number | 707-99-96200 |
| Brand | COGENG (Premium Aftermarket Replacement) |
| Condition | Brand New / Remanufactured Option Available — 100% Performance Tested |
| Component Type | Hydraulic Pump Variable Displacement Control Regulator (Swash Plate Angle Controller) |
| Compatible Equipment | Komatsu Hydraulic Excavators and Wheel Loaders — Specifically for Main Pump Assemblies (Model Verification Required by Serial Number) |
| Function | Receives Pilot Pressure Signals from the Machine's Control System and Precisely Adjusts the Pump's Swash Plate Angle to Regulate Hydraulic Flow Output |
| Construction | High-Strength Cast Iron / Alloy Steel Body; Heat-Treated Precision-Ground Spool Valve; Hardened Steel Servo Piston; Bronze Bushings |
| Control Type | Hydraulic Pilot Operated — Negative Flow Control / Positive Flow Control / Load Sensing (Configuration Dependent) |
| Maximum Control Pressure | 4.0 MPa (40 bar / 580 psi) Pilot Signal Pressure |
| Maximum System Pressure | 35 MPa (350 bar / 5,000 psi) Rated Working Pressure |
| Hydraulic Fluid Compatibility | Mineral-Based Hydraulic Oil, Synthetic Hydraulic Oil (Per Komatsu Specification) |
| Quality Assurance | 100% Bench Tested for Spool Response, Pilot Pressure Response Curve, Hysteresis, and Internal Leakage; Component Inspection Under 10x Magnification |
| Certification | ISO 9001 Certified Manufacturing Facility |
| Place of Origin | Guangdong, China |
| Supply Capacity | 200 Pieces per Month |
| Shipping Weight | 3.5 – 5.0 kg (Gross, Configuration Dependent) |
| Package Dimensions | 30 x 25 x 15 cm (Individual Box) |
| Packing | Inner: VCI Anti-Corrosion Bag; Outer: Heavy-Duty Export-Grade Corrugated Carton with Custom-Cut Protective Foam Insert |
| Payment Terms | Western Union, L/C, T/T, MoneyGram |
| Shipping Mode | By Air, By Sea, By Express (FedEx, UPS, DHL, TNT) |
| Minimum Order Quantity | Acceptable Trial Order — Single Unit Orders Welcome |
| Return Policy | Non-Returnable / Non-Exchangeable (Comprehensive DOA Guarantee Included) |
The COGENG Hydraulic Pump Regulator Assembly, part number 707-99-96200, is a precision-manufactured, high-precision hydraulic control component engineered as a direct, form-fit-function replacement for the variable displacement control regulator on Komatsu hydraulic main pump assemblies. This component is the intelligent control interface between the machine's electronic/hydraulic control system and the main pump's mechanical displacement mechanism. It is responsible for receiving pilot pressure signals—generated by the machine's operator inputs and processed by the pump control system—and converting those signals into precise mechanical movement of the pump's swash plate. By continuously and accurately adjusting the swash plate angle, the regulator controls the hydraulic pump's output flow, ensuring that the pump delivers exactly the right volume of hydraulic oil demanded by the operating conditions.
This regulator is typically mounted directly onto the main hydraulic pump body and operates in close coordination with the pump's swash plate and servo piston mechanism. The operating principle involves a precision-ground spool valve that moves in response to pilot pressure signals. When pilot pressure changes, the spool valve shifts, directing hydraulic oil to either side of the servo piston. The servo piston then extends or retracts, applying a mechanical force to the swash plate that increases or decreases its angle. A feedback linkage connects the swash plate back to the regulator, providing closed-loop position feedback that allows the regulator to hold a precise, stable pump displacement for any given pilot pressure input. This is the fundamental mechanism that enables modern Komatsu excavators and wheel loaders to achieve their renowned combination of powerful digging force, fine control precision, and fuel efficiency.
The operating environment for this regulator is demanding. It is mounted directly on the pump, exposed to the same vibration, heat, and hydraulic fluid conditions as the pump itself. The internal spool valve and servo piston are precision-fitted components that must operate with minimal friction and leakage over thousands of hours. The most common failure mode of the OEM regulator is internal leakage, where wear between the spool valve and its bore allows hydraulic oil to bypass the control edges, causing the pump to respond sluggishly, hunt, or fail to reach the commanded displacement. Contamination from degraded hydraulic oil is a primary contributor to this wear. COGENG's 707-99-96200 regulator is manufactured using heat-treated, precision-ground alloy steel for the spool valve, matched to a honed bore with exacting tolerances. The servo piston is hardened and polished for low-friction operation. Every regulator undergoes a complete bench test protocol before shipment, verifying spool response time, pilot pressure response curve linearity, hysteresis, and internal leakage rate against OEM specifications.
The 707-99-96200 regulator is used on Komatsu main pump assemblies across multiple equipment platforms. Specific model and pump assembly verification is mandatory.
| Brand | Typical Model Applications | Machine Type |
|---|---|---|
| Komatsu | Multiple Dash-6 / Dash-7 / Dash-8 Series | Hydraulic Excavators, Wheel Loaders |
Complete Regulator Assembly (1 unit): The fully assembled hydraulic pump regulator, including the cast iron/alloy steel body, precision-ground spool valve, hardened servo piston, feedback linkage components, and all internal seals.
Pre-Installed Internal Seals: All internal O-rings, backup rings, and sealing elements required for proper operation.
Pre-Installed External O-Rings: Mounting face O-rings and pilot port O-rings required for leak-free installation onto the pump body.
Protective Port Plugs: Plastic caps installed on all pilot pressure ports to prevent contamination ingress during shipping and handling.
VCI Anti-Corrosion Bag and Protective Carton: The regulator is sealed in a Vapor Corrosion Inhibitor bag, then packed in a rigid corrugated carton with custom-cut foam inserts.
Note: The following describes accompanying high-resolution product photographs.
Image 1: Complete Regulator Assembly — Isometric View
A high-resolution photograph of the 707-99-96200 regulator from a three-quarter angle. The image shows the main cast body, the mounting face with its O-ring seal grooves, the pilot pressure inlet ports, the servo piston housing, and the feedback linkage connection point.
Image 2: Mounting Face — Seal Surface Detail
A close-up view of the regulator's mounting face, showing the precision-machined flat surface with the pre-installed O-rings in their grooves. The image also shows the internal port openings that align with the corresponding ports on the pump body.
Image 3: Spool Valve Bore — Precision Detail
A detailed image showing the precision-honed bore where the spool valve operates. The image highlights the smooth surface finish and the absence of any scoring or porosity.
Image 4: Identification Markings
A photograph showing the regulator's identification markings, including the laser-etched or stamped part number 707-99-96200, the COGENG brand logo, and the manufacturing date code.
Pump Assembly Compatibility: This regulator is designed to fit specific Komatsu main pump assemblies. It is essential to verify that your pump's part number is compatible with this regulator before ordering. Provide the pump assembly part number and a photo of the old regulator for exact match confirmation.
Control Type Configuration: The 707-99-96200 regulator is configured for a specific control strategy (Negative Flow Control, Positive Flow Control, or Load Sensing). Installing a regulator with the wrong control configuration will result in incorrect pump response. Our technical team will verify the correct configuration based on your machine's serial number.
Professional Installation Required: Regulator replacement requires specialized knowledge of hydraulic pump systems. The pump must be removed or accessed with the hydraulic system completely depressurized. Precise torque specifications and alignment procedures must be followed.
Hydraulic Oil Cleanliness: Before installing the new regulator, the hydraulic system should have its oil analyzed and filters replaced. Contaminated oil is the primary cause of regulator failure.
Note: This is a summarized procedural guide. Always follow the Komatsu service manual for your specific model.
Step 1: System Preparation and Depressurization
Park the machine on level ground. Lower all attachments. Stop the engine. Operate all control levers to release stored hydraulic pressure. Clean the area around the pump and regulator thoroughly.
Step 2: Regulator Removal
Disconnect all pilot pressure lines from the regulator, immediately capping or plugging the open line ends. Remove the mounting bolts securing the regulator to the pump body. Carefully pull the regulator away from the pump, noting the position of any feedback linkage components.
Step 3: Inspection and Cleaning
Inspect the mounting surface on the pump body for any damage or debris. Clean the surface with a lint-free cloth. Verify that all old O-rings have been removed and no debris remains in the port openings.
Step 4: New Regulator Installation
Carefully position the new COGENG regulator onto the pump's mounting surface, ensuring correct alignment of the feedback linkage (if applicable). Install and hand-tighten the mounting bolts. Torque all mounting bolts to the OEM-specified torque value using a calibrated torque wrench. Reconnect all pilot pressure lines with new, lubricated O-rings. Torque all fittings to OEM specifications.
Step 5: Start-Up and Verification
Start the engine and allow it to idle. Check for any hydraulic oil leakage at the regulator mounting face and pilot line connections. Cycle all hydraulic functions and observe machine performance. Verify that the pump responds correctly to operator inputs and that no diagnostic trouble codes are present. Monitor for any abnormal noise or hesitation.
| Detail | Description |
|---|---|
| Shipping Methods | By Air, By Sea, By Express (FedEx, UPS, DHL, TNT) |
| Estimated Delivery Time | Based on carrier. Tracking provided within one business day. |
| Packing | VCI Anti-Corrosion Bag + Heavy-Duty Corrugated Carton with Protective Foam |
| 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 — Bench Tested for Guaranteed Performance.
✅ Precision Manufacturing — Heat-Treated Spool Valve, Hardened Servo Piston.
✅ In Stock — Ready for Immediate Worldwide Dispatch.
*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.
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