| Parameter | Specification |
|---|---|
| Product Name | Komatsu Hydraulic Cylinder Seal Kit / Complete Cylinder Overhaul Seal Set |
| Primary Part Number | 707-98-14410 (7079814410) |
| 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 Cylinder Reseal |
| Compatible Equipment | Komatsu Hydraulic Excavators (Model Verification Required by Serial Number) |
| Seal Material | Nitrile Butadiene Rubber (NBR), Polyurethane (PU), Polytetrafluoroethylene (PTFE), Fluorocarbon (FKM/Viton) — 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) |
| 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 | 0.5 – 1.5 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 Hydraulic Cylinder Seal Kit, part number 707-98-14410 (7079814410), is a comprehensive, precision-manufactured overhaul seal set engineered as a direct, form-fit-function replacement for the hydraulic cylinder seals on a range of Komatsu hydraulic excavator platforms. This seal kit contains every sealing component required to completely overhaul and reseal a hydraulic cylinder—restoring it to leak-free, factory-specification performance. The part number 707-98-14410 belongs to the Komatsu seal kit parts family and is commonly associated with specific cylinder applications on multiple Komatsu excavator models. Our technical team will verify the exact cylinder application based on your machine's serial number.
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; 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; the buffer seal, a secondary dynamic seal located ahead of the rod seal that absorbs pressure spikes and protects the rod seal from shock loads; the dust seal or wiper seal, the outermost seal that wipes dirt, dust, 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, and prevent metal-to-metal contact between moving components.
The operating environment for hydraulic cylinder seals on a Komatsu excavator is exceptionally severe. The seals must withstand continuous internal pressures exceeding 30 MPa during heavy digging operations, with pressure spikes that can momentarily approach 40 MPa when a loaded bucket stalls or when the cylinder reaches the end of its stroke. The rod seal and dust seal are directly exposed to the external environment, subjected to abrasive dust, mud, water, and the chemicals used in machine washing. The seals must maintain their elasticity, hardness, and dimensional stability across a wide temperature range, from cold morning startups in winter conditions to sustained operating temperatures exceeding 100°C during heavy summer work. The primary failure modes of OEM seals are predictable: material degradation from thermal aging, compression set that causes the seal lip to lose contact with the sealing surface, abrasion and wear from contaminated hydraulic oil, extrusion damage at the seal groove corners under high pressure, and physical damage to the rod seal and dust seal from contaminated or damaged cylinder rods.
COGENG's 707-98-14410 seal kit is manufactured using premium sealing materials selected for each specific application: high-performance polyurethane for the rod seal and dust seal, offering exceptional abrasion resistance and low friction; 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 in the kit is dimensionally inspected against OEM specifications and material-tested for hardness and tensile strength before shipment.
The 707-98-14410 seal kit is used on multiple Komatsu excavator platforms. Specific model and cylinder application verification is mandatory.
| Brand | Typical Model Applications | Machine Type |
|---|---|---|
| Komatsu | Multiple Dash-6 / Dash-7 / Dash-8 Series | Hydraulic Excavators |
Note: To confirm exact compatibility, please provide the complete machine model and serial number, and identify which cylinder (boom, arm, or bucket) you are servicing. A photo of the old seals or the cylinder assembly is helpful for verification.
Each COGENG 707-98-14410 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.
Rod Seal Assembly: Dynamic seal for the cylinder rod, manufactured from high-performance polyurethane.
Buffer Seal: Secondary dynamic seal installed ahead of the rod seal to absorb pressure spikes.
Dust Seal / Wiper Seal: Outermost seal with double-lip design for contamination exclusion.
O-Rings (Complete Set): All O-rings required for static sealing, manufactured from NBR 90 Shore A.
Backup Rings: Anti-extrusion rings manufactured from PTFE or glass-filled nylon.
Wear Rings / Guide Rings: Centering rings manufactured from glass-filled nylon.
Anti-Static PP Bag and Export Carton: All components sealed in protective packaging.
Note: The following descriptions provide a detailed technical walkthrough of accompanying high-resolution product photographs.
Image 1: Complete Seal Kit — Component Overview
A photograph showing all components of the 707-98-14410 seal kit laid out in an organized arrangement with each seal type clearly labeled.
Image 2: Piston Seal — Profile Detail
A close-up macro photograph of the piston seal, showing its cross-sectional profile and precision-molded sealing lip geometry.
Image 3: Rod Seal and Buffer Seal — Profile Detail
A detailed image showing the rod seal and buffer seal profiles with their precision-molded sealing edges.
Image 4: Dust Seal — Lip Design
A macro photograph of the dust seal, showing the double-lip design.
Image 5: O-Rings and Backup Rings
A photograph showing the complete O-ring and backup ring set.
Cylinder Application Verification: The 707-98-14410 seal kit is designed for specific cylinder applications. Verify which cylinder (boom, arm, or bucket) requires this kit before ordering. Our technical team will confirm based on your machine serial number.
Material Compatibility: Seals are compatible with mineral-based hydraulic oils, synthetic hydraulic oils, and water-glycol fluids. Not compatible with phosphate ester fluids.
Cylinder Rod Inspection: Before installing new seals, thoroughly inspect the cylinder rod for scratches, pitting, or chrome damage. A damaged rod will destroy new seals rapidly.
Installation Cleanliness: Seal installation requires a surgically clean environment. Dirt introduced during installation will cause premature seal failure.
Professional Installation Recommended: This work is best performed in a clean shop environment by a qualified hydraulic technician with the proper tools.
Note: Summarized guide. Always follow the Komatsu service manual.
Step 1: Cylinder Removal and Disassembly
Remove the cylinder from the machine. Secure in a work stand. Clean thoroughly. Drain oil. Disassemble cylinder: remove end cap, extract piston rod assembly, remove old seals and wear rings. Inspect all components.
Step 2: Component Cleaning and Inspection
Thoroughly clean all components. Inspect cylinder bore, piston, cylinder head, and rod for damage. Verify seal grooves are clean and undamaged.
Step 3: New Seal Installation
Install new seals using appropriate tools. Install piston seal, wear rings, and O-rings onto piston. Install rod seal, buffer seal, dust seal, and O-rings into cylinder head. Use installation sleeves to prevent damage. Lubricate all seals with clean hydraulic oil.
Step 4: Cylinder Reassembly
Insert piston rod assembly into cylinder barrel. Install end cap and torque to OEM specifications. Verify smooth rod movement.
Step 5: Installation and Testing
Reinstall cylinder onto machine. Reconnect hydraulic lines. Refill system. Cycle cylinder through full stroke. Check for leaks. Verify correct operation.
| Detail | Description |
|---|---|
| Shipping Methods | By Air, By Sea, By Express (FedEx, UPS, DHL, TNT) |
| Estimated Delivery Time | Express: 3-5 business days. Air: 8-15 days. Sea: 30-45 days. Tracking provided within one business day. |
| Packing | Inner: Anti-static PP bag with desiccant. Outer: Heavy-duty corrugated carton with protective foam. |
| Payment Terms | Western Union, L/C, T/T, MoneyGram, D/A, D/P. Standard: 30% T/T deposit, 70% 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 cannot be restocked once opened. |
| DOA Quality Guarantee | Full replacement for manufacturing defects within 7 days. Kit must be in original, unopened condition. |
| Pre-Shipment Confirmation | We send photos of your exact seal kit for written approval before dispatch. |
Q1: What cylinder does this seal kit fit?
A: The 707-98-14410 seal kit is designed for specific Komatsu excavator cylinder applications. Provide your machine serial number and specify which cylinder (boom, arm, bucket) you are servicing, and our technical team will confirm the correct kit.
Q2: What are the symptoms of worn cylinder seals?
A: Hydraulic oil leaking from the rod area, cylinder drift under load, reduced digging force, jerky movement, scoring on the rod, and excessive oil consumption.
Q3: Does this kit service one cylinder or all cylinders?
A: This kit contains seals for one complete cylinder overhaul. Each cylinder requires its own seal kit.
Q4: Can I install this myself?
A: While experienced mechanics can perform this work, we recommend professional installation in a clean environment with the proper tools.
Q5: How long will these seals last?
A: With clean oil, an undamaged rod, and correct installation, these seals will provide service life equivalent to or exceeding OEM seals.
For pricing, machine-down emergency support, trial orders, bulk discounts, or pre-purchase compatibility verification, contact your COGENG supplier today.
Sales Price: Contact COGENG sales customer service for the most current competitive pricing.
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.
✅ Direct OEM Replacement — Complete Cylinder Overhaul Kit.
✅ Premium Sealing Materials — Polyurethane, NBR, PTFE, Glass-Filled Nylon.
✅ ISO 9001 Certified — 100% Dimensional Inspection, 500 Kits Monthly Supply.
✅ Trial Orders Welcome — Single Unit Orders Accepted.
✅ In Stock & Ready to Ship — Immediate Worldwide Dispatch.
Critical Action: Please provide your Komatsu excavator's complete model and serial number, and identify which cylinder you are servicing for 100% compatibility confirmation.
Merchant Return Policy: All products shipped 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.
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