| Parameter | Specification |
|---|---|
| Product Name | Komatsu Motor Grader Blade Shift Hydraulic Cylinder Seal Kit / Complete Cylinder Overhaul Seal Set |
| Primary Part Number | 707-98-14040 (7079814040) |
| Brand | COGENG (Premium Aftermarket Replacement) |
| Condition | Brand New, 100% Dimensionally Inspected and Material Verified |
| Kit Type | Complete Hydraulic Cylinder Overhaul Seal Kit — Contains All Seals Required for Full Blade Shift Cylinder Reseal |
| Compatible Equipment | Komatsu GD313A-1 Motor Grader |
| Cylinder Application | Blade Shift Cylinder (Blade Side-Shift Hydraulic Cylinder) |
| Seal Material | Nitrile Butadiene Rubber (NBR), Polyurethane (PU), Polytetrafluoroethylene (PTFE) — Application-Specific |
| Backup Ring Material | Glass-Filled Nylon, PTFE, POM (Acetal) |
| Dust Seal Material | Polyurethane (PU) with Double-Lip Design for Superior Contamination Exclusion |
| O-Ring Material | NBR (Nitrile) 90 Shore A Durometer — High Pressure Resistant |
| Wear Ring / Guide Ring Material | Glass-Filled Nylon or Phenolic Resin Composite |
| Operating Temperature Range | -30°C to +110°C (NBR/PU); -20°C to +200°C (FKM Components if Equipped) |
| Maximum Working Pressure | 35 MPa (350 bar / 5,000 psi) Rated |
| Hydraulic Fluid Compatibility | Mineral-Based Hydraulic Oil, Synthetic Hydraulic Oil, Water-Glycol Fire-Resistant Fluids (Per Seal Material Specification) |
| Quality Assurance | 100% Dimensional Inspection Against OEM Specifications; Material Hardness Verification (Shore A / Shore D); Tensile Strength Testing; Visual Inspection Under 10x Magnification |
| Certification | ISO 9001 Certified Manufacturing Facility |
| Place of Origin | Guangdong, China |
| Supply Capacity | 500 Pieces per Month |
| Shipping Weight | 0.3 – 0.8 kg (Gross, Kit Dependent) |
| Package Dimensions | 20 x 15 x 10 cm (Individual Box) |
| Packing | Inner: Anti-Static PP Bag with Desiccant; Outer: Heavy-Duty Export-Grade Corrugated Carton Box with Custom-Cut Protective Foam Insert |
| Payment Terms | Western Union, L/C (Letter of Credit), T/T (Telegraphic Transfer), MoneyGram, D/A (Documents against Acceptance), D/P (Documents against Payment) |
| Shipping Mode | By Air, By Sea, By Express (FedEx, UPS, DHL, TNT, etc.) — Optimized Based on Cargo Situation and Destination |
| Minimum Order Quantity | Acceptable Trial Order — Single Unit Orders Welcome |
| Return Policy | Non-Returnable / Non-Exchangeable (Comprehensive DOA Guarantee Included) |
The COGENG Blade Shift Cylinder Seal Kit, part number 707-98-14040 (7079814040), is a comprehensive, precision-manufactured overhaul seal set engineered as a direct, form-fit-function replacement for the blade shift hydraulic cylinder on the Komatsu GD313A-1 motor grader. This seal kit contains every sealing component required to completely overhaul and reseal the blade shift cylinder—the hydraulic cylinder responsible for laterally positioning the grader blade from side to side—restoring it to leak-free, factory-specification performance. The Komatsu GD313A-1 is a 3.1-meter class motor grader used globally in road construction, road maintenance, site preparation, snow removal, and general earthmoving applications. The blade shift cylinder is one of the most frequently actuated hydraulic cylinders on the entire machine, operating continuously during every grading pass as the operator adjusts the blade's lateral offset to control material placement and cutting path.
A hydraulic cylinder seal kit functions as the complete internal sealing system of the cylinder assembly. The primary sealing components include: the piston seal, a high-pressure dynamic seal that rides on the cylinder bore and separates the high-pressure side of the piston from the low-pressure side, preventing hydraulic fluid from bypassing the piston and causing cylinder drift or power loss during blade positioning; the rod seal, a dynamic seal that rides on the chrome-plated cylinder rod and prevents pressurized hydraulic fluid from leaking out of the cylinder head during extension and retraction of the blade shift function; the buffer seal, a secondary dynamic seal located ahead of the rod seal that absorbs pressure spikes generated during rapid blade positioning and protects the rod seal from shock loads; the dust seal or wiper seal, the outermost seal that wipes dirt, dust, road debris, and moisture from the rod surface as it retracts, preventing contamination from entering the cylinder and damaging internal components; the O-rings and backup rings, which provide static sealing at the cylinder head, piston, and end cap interfaces and prevent extrusion of the primary seals under high pressure; and the wear rings and guide rings, which center the piston and rod within the cylinder bore, absorb side loads from blade forces, and prevent metal-to-metal contact between moving components.
The operating environment for the blade shift cylinder seals on a GD313A-1 motor grader is uniquely demanding. Unlike an excavator that may work in a relatively contained area, a motor grader operates across long stretches of road, continuously exposed to abrasive dust, dirt, gravel, and road debris kicked up by the blade and tires. The blade shift cylinder is mounted on the drawbar circle assembly, positioned directly in the dust cloud generated by the grading operation. The dust seal must continuously wipe abrasive particles from the cylinder rod surface with every actuation. The cylinder operates at high frequency—the operator may make dozens of small blade shift adjustments per pass—subjecting the seals to continuous reciprocating motion and wear. The hydraulic system operates at pressures up to 35 MPa during heavy cutting operations. The seals must maintain their integrity in all weather conditions, from freezing winter temperatures during snow removal operations to intense summer heat during road construction. COGENG's 707-98-14040 seal kit is manufactured using premium sealing materials selected for each application: high-performance polyurethane for the rod seal and dust seal, offering exceptional abrasion resistance, low friction, and long service life under continuous reciprocation; nitrile rubber for O-rings and static seals, providing excellent oil resistance and elasticity; PTFE for buffer seals and backup rings, offering low friction and high extrusion resistance; and glass-filled nylon for wear rings, providing excellent side load capacity and dimensional stability. Every seal is dimensionally inspected against OEM specifications and material-tested before shipment.
The 707-98-14040 seal kit is specifically designed for the Komatsu GD313A-1 motor grader blade shift cylinder. Always provide your complete machine model and serial number for final compatibility verification.
| Brand | Model | Machine Type | Cylinder Application |
|---|---|---|---|
| Komatsu | GD313A-1 | Motor Grader (3.1-Meter Class) | Blade Shift Cylinder |
Each COGENG 707-98-14040 Blade Shift Seal Kit contains the following components:
Piston Seal Assembly: High-pressure dynamic seal for the piston, manufactured from high-performance polyurethane or PTFE with an NBR energizer. Provides leak-free sealing across the full pressure range.
Rod Seal Assembly: Dynamic seal for the cylinder rod, manufactured from high-performance polyurethane. Prevents hydraulic fluid leakage from the cylinder head during blade shift operation.
Buffer Seal: Secondary dynamic seal installed ahead of the rod seal to absorb pressure spikes and protect the rod seal from shock loads during rapid blade positioning.
Dust Seal / Wiper Seal: Outermost seal with a double-lip design to wipe abrasive road dust and debris from the rod surface and prevent ingress into the cylinder.
O-Rings (Complete Set): All O-rings required for static sealing at the cylinder head, piston, and end cap interfaces, manufactured from NBR 90 Shore A.
Backup Rings: Anti-extrusion rings manufactured from PTFE or glass-filled nylon to prevent seal extrusion at high pressure.
Wear Rings / Guide Rings: Centering rings manufactured from glass-filled nylon to absorb side loads from blade forces and prevent metal-to-metal contact.
Anti-Static PP Bag and Export Carton: All components are sealed in an anti-static PP bag with desiccant and packed in a protective carton with foam insert.
Note: The following descriptions provide a detailed technical walkthrough of accompanying high-resolution product photographs.
Image 1: Complete Seal Kit — Component Overview
A high-resolution photograph showing all components of the 707-98-14040 seal kit laid out in an organized arrangement. Each seal type—piston seal, rod seal, buffer seal, dust seal, O-rings, backup rings, and wear rings—is clearly displayed and labeled for identification.
Image 2: Piston Seal — Profile Detail
A close-up macro photograph of the piston seal, showing its cross-sectional profile and the precision-molded sealing lip geometry. The image highlights the seal's sliding surface finish.
Image 3: Rod Seal and Buffer Seal — Profile Detail
A detailed image showing the rod seal and buffer seal profiles. The precision-molded sealing edges and backup geometry are clearly visible.
Image 4: Dust Seal — Double-Lip Design
A macro photograph of the dust seal, showing the double-lip design with the primary wiper lip and secondary contamination exclusion lip. The image highlights the sharp, clean sealing edges.
Image 5: O-Rings, Backup Rings, and Wear Rings
A photograph showing the complete O-ring, backup ring, and wear ring set, displaying dimensional consistency and surface finish quality.
Blade Shift Cylinder Specificity: The 707-98-14040 seal kit is specifically for the blade shift cylinder on the Komatsu GD313A-1 motor grader. It may not be the correct kit for other cylinders on the machine (blade lift cylinders, circle turn cylinder, blade tilt cylinder, articulation cylinders, or steering cylinders). Verify the specific cylinder application before ordering.
Material Compatibility: Seals are manufactured from NBR, polyurethane, PTFE, and glass-filled nylon. Fully compatible with mineral-based hydraulic oils, synthetic hydraulic oils, and water-glycol fire-resistant fluids. Not compatible with phosphate ester fluids.
Cylinder Rod Inspection: Before installing the new seal kit, the blade shift cylinder rod must be thoroughly inspected for scratches, pitting, chrome peeling, or bending. Motor grader cylinder rods are particularly susceptible to impact damage from road debris. A damaged rod will rapidly destroy new seals.
Installation Cleanliness: Hydraulic cylinder seal installation requires a surgically clean work environment. Any dirt or debris introduced during installation will cause premature seal failure and potential cylinder bore damage.
Professional Installation Recommended: While experienced mechanics can perform cylinder resealing in the field, this work is best performed in a clean shop environment by a qualified hydraulic technician with proper seal installation tools.
Note: This is a summarized procedural guide. Always follow the Komatsu service manual.
Step 1: Cylinder Removal and Disassembly
Position the motor grader on level ground. Lower the blade to the ground. Stop the engine. Clean the area around the blade shift cylinder. Disconnect hydraulic lines and cap all open ports. Remove the cylinder mounting pins and extract the cylinder from the drawbar assembly. Secure the cylinder in a suitable work stand. Drain the hydraulic oil. Disassemble the cylinder: remove the end cap, extract the piston rod assembly, and remove all old seals and wear rings.
Step 2: Component Cleaning and Inspection
Thoroughly clean all cylinder components with clean solvent. Inspect the cylinder bore for scoring, scratches, or wear. Inspect the piston and cylinder head for damage. Inspect the cylinder rod for pitting, scratches, chrome damage, or bending. Verify that all seal grooves are clean, undamaged, and free of burrs.
Step 3: New Seal Installation
Using appropriate seal installation tools, carefully install the new seals from the COGENG kit. Install the piston seal, wear rings, and O-rings onto the piston. Install the rod seal, buffer seal, dust seal, and O-rings into the cylinder head. Use seal installation sleeves to prevent seal damage when passing seals over threads and sharp edges. Lubricate all seals with clean hydraulic oil or a compatible assembly lubricant.
Step 4: Cylinder Reassembly
Carefully insert the piston rod assembly into the cylinder barrel. Install the end cap and torque to OEM specifications. Verify that the rod moves smoothly through its full stroke without binding.
Step 5: Installation and Testing
Reinstall the blade shift cylinder onto the machine. Reconnect all hydraulic lines. Refill the hydraulic system. Start the engine and cycle the blade shift function through its full range multiple times to purge air. Check for leaks at the rod seal and all static connections. Verify correct blade shift operation and no drift.
| Detail | Description |
|---|---|
| Shipping Methods | By Air: Cost-effective for urgent orders. By Sea: Most economical for bulk distributor orders. By Express (FedEx, UPS, DHL, TNT): Fastest door-to-door service (3-5 business days). Method optimized based on cargo situation and destination. |
| Estimated Delivery Time | Express: 3-5 business days. Air Freight: 8-15 days. Sea Freight: 30-45 days. Transit times are carrier-dependent. Tracking provided within one business day of dispatch. |
| Packing | Inner: Anti-static PP bag with desiccant. Outer: Heavy-duty export-grade corrugated carton box with custom-cut protective foam. |
| Payment Terms | Western Union, L/C, T/T, MoneyGram, D/A, D/P. Standard terms: 30% T/T deposit, 70% balance before shipment. |
| Minimum Order Quantity | Acceptable Trial Order — Single unit orders welcomed. |
| Policy Point | Terms |
|---|---|
| Merchant Return Policy | All sales are final. No returns or exchanges. Seal kits are precision sealing components. Once departed from our controlled environment, we cannot verify they have not been installed, contaminated, or damaged. |
| DOA Quality Guarantee | Full replacement for manufacturing defects reported within 7 days of delivery. Kit must be in original, unopened condition. |
| Pre-Shipment Confirmation | We send high-resolution photos of your exact seal kit for written approval before dispatch. |
Q1: What cylinder does this seal kit fit?
A: The 707-98-14040 seal kit is specifically designed for the blade shift cylinder on the Komatsu GD313A-1 motor grader. The blade shift cylinder controls the lateral positioning of the grader blade. If you are servicing a different cylinder, please verify the correct kit part number with our technical team.
Q2: What are the symptoms of worn blade shift cylinder seals?
A: Common symptoms include: hydraulic oil leaking from the cylinder rod area, blade drift where the blade slowly shifts position under load, reduced blade positioning accuracy, jerky or uneven blade movement, visible scoring on the cylinder rod, and excessive hydraulic oil consumption.
Q3: Does this kit service one cylinder or all cylinders?
A: This kit contains the seals required to overhaul one blade shift cylinder. Each cylinder on the motor grader (blade lift, circle turn, blade tilt, articulation, steering) requires its own specific seal kit.
Q4: Can I install this seal kit myself?
A: Hydraulic cylinder resealing requires mechanical skill, proper tools, and a clean work environment. While experienced mechanics can perform this work in the field, we recommend professional installation in a clean shop environment for maximum seal service life.
Q5: How long will these seals last?
A: With clean hydraulic oil, an undamaged cylinder rod, and correct installation, these seals will provide service life equivalent to or exceeding OEM seals. Motor grader blade shift cylinders operate in dusty environments, so regular inspection of the dust seal is recommended.
For pricing, machine-down emergency support, trial orders, bulk quantity discounts, or pre-purchase compatibility verification, contact your COGENG supplier today.
Sales Price: Contact COGENG sales customer service directly for the most current competitive pricing. Trial orders welcome.
Shipping Method & Cost: We will quote the optimal shipping solution based on your location and urgency.
Estimated Delivery Time: Based on the selected carrier. Tracking provided within one business day of dispatch.
✅ Direct OEM Replacement — Complete Blade Shift Cylinder Overhaul Kit.
✅ Komatsu GD313A-1 Motor Grader Compatible — Specifically Validated for Blade Shift Cylinder.
✅ Premium Sealing Materials — Polyurethane, NBR, PTFE, Glass-Filled Nylon for Maximum Service Life.
✅ ISO 9001 Certified — 100% Dimensional Inspection, 500 Kits Monthly Supply.
✅ Trial Orders Welcome — Single Unit Orders Accepted.
✅ In Stock & Ready to Ship — Keep Your Motor Grader Productive with Immediate Worldwide Dispatch.
Critical Action: To ensure 100% compatibility, please provide your Komatsu GD313A-1 motor grader's complete serial number and confirm that you are servicing the blade shift cylinder. Our technical team will verify before your order is processed.
Merchant Return Policy: All products shipped are not returnable or exchangeable. Please complete all compatibility checks before purchase.
