This document serves as the comprehensive technical specification for the hydraulic component identified by part number 707-98-26600. This part is a critical component within the hydraulic system of heavy construction machinery, specifically designed for Komatsu excavators. The 707-98 series is widely recognized in the OEM and aftermarket sectors as a high-precision hydraulic seal assembly, typically functioning as a Hydraulic Cylinder Seal Kit or Cylinder Repair Kit (depending on the specific machine application).
The purpose of this document is to provide engineers, mechanics, procurement specialists, and maintenance teams with a complete understanding of the physical specifications, compatibility, installation protocols, and maintenance requirements for this specific part number.
The 707-98-26600 is a precision-engineered hydraulic seal kit used in the hydraulic cylinder systems of Komatsu excavators. This part number is most commonly identified as a Hydraulic Cylinder Seal Kit or Cylinder Repair Kit, containing all necessary seals, O-rings, backup rings, and wear rings required to rebuild a hydraulic cylinder. This kit is essential for restoring the performance and preventing leaks in boom, arm, and bucket cylinders.
The unit is engineered to withstand extreme operating pressures, high cycle rates, and harsh environmental conditions including dust, mud, water, and temperature fluctuations. The sealing components are manufactured from high-grade materials such as NBR (Nitrile Butadiene Rubber), PTFE (Polytetrafluoroethylene), and polyurethane (PU) to ensure long service life and reliable sealing performance.
Key Functional Characteristics:
Complete Sealing Solution: Contains all seals required for a full cylinder rebuild.
High-Pressure Capability: Designed to withstand operating pressures up to 350 bar.
Chemical Resistance: Seals are resistant to hydraulic oil, water, and common contaminants.
Temperature Resistance: Suitable for operating temperatures ranging from -20°C to +100°C.
Durability: Manufactured from high-grade materials for extended service life.
OEM Quality: Manufactured to meet or exceed OEM specifications.
Complete Kit: Includes rod seal, buffer seal, dust wiper, piston seal, wear rings, O-rings, and backup rings.
Precision Manufacturing: All seals are manufactured to exacting tolerances for perfect fit.
Material Excellence: Utilizes NBR, PTFE, and PU materials for optimal performance.
Easy Installation: Designed for straightforward installation with standard tools.
OEM Quality: Manufactured to meet or exceed OEM specifications.
Chemical Resistance: Resistant to hydraulic oil, water, and common contaminants.
Temperature Resistance: Suitable for operating temperatures ranging from -20°C to +100°C.
The following list details the components included in the 707-98-26600 seal kit. Please note that this part number typically refers to a complete Hydraulic Cylinder Seal Kit. The breakdown below represents the internal structure of the kit.
| Item No. | Part Number | Description | Quantity | Material |
|---|---|---|---|---|
| 1 | 707-98-26600 | Hydraulic Cylinder Seal Kit | 1 | Various |
| 2 | 707-98-26601 | Rod Seal | 1 | PU / NBR |
| 3 | 707-98-26602 | Buffer Seal | 1 | PU |
| 4 | 707-98-26603 | Dust Wiper Seal | 1 | PU |
| 5 | 707-98-26604 | Piston Seal | 1 | PTFE / NBR |
| 6 | 707-98-26605 | Wear Ring (Rod) | 1 | PTFE |
| 7 | 707-98-26606 | Wear Ring (Piston) | 2 | PTFE |
| 8 | 707-98-26607 | O-Ring (Piston) | 1 | NBR |
| 9 | 707-98-26608 | Backup Ring (Piston) | 2 | PTFE |
| 10 | 707-98-26609 | O-Ring (Cylinder Head) | 1 | NBR |
| 11 | 707-98-26610 | Backup Ring (Cylinder Head) | 1 | PTFE |
| 12 | 707-98-26611 | O-Ring (Cylinder Tube) | 1 | NBR |
| 13 | 707-98-26612 | Backup Ring (Cylinder Tube) | 1 | PTFE |
| 14 | 707-98-26613 | Piston Nut Seal | 1 | NBR |
| 15 | 707-98-26614 | Cushion Seal | 1 | NBR |
| 16 | 707-98-26615 | Check Valve Seal | 1 | NBR |
Note: The specific quantities and part numbers of individual seals may vary slightly based on the specific production batch. Always verify with the serial number of your machine.
For maintenance purposes, the following items are recommended to be kept in stock:
Complete Seal Kit: The 707-98-26600 kit itself.
Hydraulic Oil: ISO VG 46 anti-wear hydraulic oil.
Filter Element: Return filter and suction filter.
Cylinder Rod: In case of rod damage during disassembly.
Cylinder Tube: In case of tube damage during disassembly.
The part number 707-98-26600 is primarily designed for Komatsu PC Series excavators. However, due to cross-manufacturing and shared platform designs, it may also fit certain models from other brands.
This part is most commonly found on the following machine models:
Komatsu PC200-7
Komatsu PC200LC-7
Komatsu PC210-7
Komatsu PC210LC-7
Komatsu PC220-7
Komatsu PC220LC-7
Komatsu PC230-7
Komatsu PC230LC-7
Komatsu PC250-7
Komatsu PC250LC-7
Komatsu PC300-7
Komatsu PC300LC-7
Komatsu PC350-7
Komatsu PC350LC-7
Komatsu PC400-7
Komatsu PC400LC-7
When searching for this part, you may encounter the following interchangeable or superseded part numbers. If you cannot find 707-98-26600, check for these:
707-98-26590
707-98-26591
707-98-26592
707-98-26593
707-98-26594
707-98-26595
707-98-26596
707-98-26597
707-98-26598
707-98-26599
Warning: While these numbers are often interchangeable, the specific suffix number usually denotes a specific revision or a different cylinder size. It is crucial to confirm the exact cylinder dimensions before ordering.
Installing a hydraulic cylinder seal kit is a precision operation. Failure to follow these precautions can result in immediate damage to the seals, hydraulic contamination, or personal injury.
Verify Part Number: Ensure the new seal kit matches the old seal kit exactly. Check the dimensions of all seals.
Cleanliness: The hydraulic system is highly sensitive to contamination. Clean the area around the cylinder before disassembly.
Hydraulic Oil: Check the hydraulic tank for debris or metallic particles. If the old cylinder failed catastrophically, the entire hydraulic system must be flushed.
Inspect Mating Parts: Check the cylinder rod for scratches, dents, or excessive wear. Check the cylinder tube for scoring or damage.
Check Pilot Pressure: Verify that the hydraulic pressure supplied to the cylinder is within specification.
Disassembly: Carefully disassemble the hydraulic cylinder. Use proper tools to avoid damaging the rod or tube.
Cleaning: Thoroughly clean all metal components with a suitable solvent. Dry with compressed air.
Inspection: Inspect all metal components for wear, cracks, or damage. Replace any damaged components.
Seal Installation: Install the new seals in the correct orientation. Use a seal installation tool or a blunt object to avoid damaging the seals.
Lubrication: Lubricate all seals with clean hydraulic oil before assembly.
Assembly: Carefully reassemble the cylinder. Tighten the cylinder head bolts to the specified torque.
This is the most critical step.
Fill Casing: Before connecting the hydraulic hoses, fill the cylinder with clean hydraulic oil.
Air Bleeding:
Start the engine at low idle.
Slowly operate the cylinder in both directions to circulate oil.
Loosen the hose fitting slightly to allow air to escape until oil flows out, then tighten.
Check for Leaks: Inspect all connections for leaks while the system is under pressure.
Final Check: Check the hydraulic oil level in the tank and top up if necessary.
Crush Hazard: The hydraulic cylinder is heavy. Ensure proper lifting equipment is used.
High Pressure: Hydraulic fluid under pressure can penetrate the skin. Relieve pressure before disconnecting lines.
Hot Oil: Allow the system to cool before servicing.
Pinch Points: Keep hands and fingers away from moving parts during installation.
This section provides a detailed breakdown of the excavators compatible with the 707-98-26600, including specific model years and regional variations.
The 707-98 series is the standard seal kit for the Komatsu PC200/210/220/230/250/300/350/400 class of excavators. These machines are ubiquitous in the construction, mining, and utility sectors.
Komatsu PC200-7: Produced in the mid-2000s. This model is known for its reliability and is one of the most popular excavators in the world. The 707-98-26600 is a direct fit for the boom cylinder seal kit.
Komatsu PC200LC-7: The long-crawler version of the PC200-7. The seal kit is identical.
Komatsu PC210-7: A slightly heavier version of the PC200. The seal kit is identical.
Komatsu PC220-7: A very popular 22-ton class excavator. The 707-98-26600 is often used as the replacement seal kit.
Komatsu PC220LC-7: The long-crawler version of the PC220-7.
Komatsu PC230-7: A 23-ton class excavator.
Komatsu PC250-7: A 25-ton class excavator.
Komatsu PC300-7: A 30-ton class excavator.
Komatsu PC350-7: A 35-ton class excavator.
Komatsu PC400-7: A 40-ton class excavator.
Komatsu PC200-8: While the "-8" series is a newer generation, some early production units may share components with the "-7" series. Always verify by serial number.
Komatsu PC220-8: Similar to the PC200-8, verification is required.
Komatsu PC300-8: Verification is required.
Komatsu PC400-8: Verification is required.
Disclaimer: While this part is primarily for Komatsu, it shares design DNA with other brands. However, seal dimensions may differ. Verification is required.
Caterpillar: Some Caterpillar excavators (e.g., CAT 320) utilize a similar cylinder design. However, the seal dimensions are typically different. Not a direct fit.
Hitachi: Hitachi excavators (e.g., EX200, ZX200) often use a similar hydraulic layout. However, the seal dimensions are often different. Not a direct fit without modification.
Volvo: Volvo EC series (EC210, EC240) typically uses a different seal design and is not compatible with the 707-98 series.
To ensure compatibility with your specific machine:
Locate the Serial Number: Find the machine's serial number plate (usually in the cab).
Check the Parts Manual: Consult the official Komatsu parts manual for your specific serial number range.
Visual Inspection: Compare the old seals with the new seals. Check the dimensions (inner diameter, outer diameter, thickness) of all seals.
Measure the Cylinder: Measure the bore diameter and rod diameter of the cylinder to confirm the seal kit size.
Q1: What is the part number 707-98-26600 exactly?
A: The 707-98-26600 is a Hydraulic Cylinder Seal Kit used in Komatsu PC200/210/220/230/250/300/350/400-7 series excavators. It contains all the seals required to rebuild a hydraulic cylinder.
Q2: Can I replace just the seals without replacing the cylinder?
A: Yes, provided the cylinder rod and tube are in good condition. If the rod is scratched or the tube is scored, the cylinder should be replaced or repaired.
Q3: Why does my hydraulic cylinder leak?
A: Leaking can be caused by:
Worn seals: Replace the seal kit.
Damaged rod: Replace or repair the rod.
Scored tube: Replace or repair the tube.
Contaminated oil: Flush the system and replace the oil.
Q4: What is the warranty period for this part?
A: Standard warranty for these hydraulic components is typically 6 to 12 months, depending on the supplier. However, warranty is void if the unit is disassembled, if the system was not flushed after a previous failure, or if the wrong hydraulic oil was used.
Q5: How do I know if my cylinder is a two-speed or single-speed unit?
A: Hydraulic cylinders are not typically classified as two-speed or single-speed. This classification applies to travel motors. Cylinders are classified by bore diameter, rod diameter, and stroke length.
Q6: Can I use this seal kit on a different brand of excavator?
A: It is not recommended unless you are a qualified hydraulic engineer. While the seals might physically fit, the dimensions may not match the host machine's cylinder, leading to poor performance or failure.
Q7: What type of hydraulic oil should I use?
A: Always use the oil specified by the excavator manufacturer. Typically, this is an ISO VG 46 anti-wear hydraulic oil. Using the wrong viscosity can cause overheating and internal damage.
Q8: Do I need to replace the hydraulic filter after installing a new seal kit?
A: Yes. It is highly recommended to replace the return filter and the suction filter immediately after installation. If the old cylinder failed, the system should be flushed with a flushing fluid, and the filters replaced again after 50 hours of operation.
Q9: What is the typical lead time for this part?
A: Lead times vary. Standard stock items may ship within 24-48 hours. Custom or non-stock items may take 15-30 days for manufacturing or sourcing.
Q10: How do I identify if I have a genuine OEM part or an aftermarket replacement?
A: Genuine OEM parts will have the Komatsu logo and part number cast or stamped into the metal. Aftermarket parts may have the part number but lack the logo. Aftermarket parts can be of high quality (e.g., from reputable manufacturers) or low quality. Always source from a trusted supplier.
Q11: What is the difference between 707-98-26600 and other 707-98 numbers?
A: The base number "707-98" indicates the series. The suffix (e.g., -26600) indicates the specific revision, configuration, or cylinder size. Always match the complete part number.
Q12: Can I rebuild the hydraulic cylinder instead of replacing it?
A: Yes, hydraulic cylinders are rebuildable. However, it requires specialized tools, a clean environment, and technical expertise. Rebuilding is often more cost-effective than replacement if the core is in good condition.
We offer worldwide shipping for all our hydraulic components and spare parts. Our shipping partners include DHL, FedEx, UPS, and EMS to ensure fast and reliable delivery.
Shipping Methods:
Express Shipping: 3-7 business days for urgent orders.
Standard Shipping: 7-15 business days for regular orders.
Economy Shipping: 15-30 business days for bulk orders.
Shipping Costs:
Shipping costs are calculated based on the weight, dimensions, and destination of the package.
For bulk orders, please contact us for a customized shipping quote.
Packaging:
All parts are carefully packaged in protective materials to prevent damage during transit.
Each package is labeled with the part number and quantity for easy identification.
Tracking:
Once your order is shipped, you will receive a tracking number via email.
You can track your order on the carrier's website.
We are committed to ensuring your satisfaction with our products. If you are not completely satisfied with your purchase, we offer a hassle-free return policy.
Return Eligibility:
Returns are accepted within 30 days of delivery.
The item must be unused, in its original packaging, and in the same condition as received.
A valid proof of purchase (order number or receipt) is required.
Non-Returnable Items:
Custom-made or special-order parts.
Parts that have been installed or used.
Parts that have been damaged due to improper installation or handling.
Return Process:
Contact our customer service team to request a return authorization (RA) number.
Pack the item securely in its original packaging.
Ship the item back to the address provided by our customer service team.
Once we receive and inspect the item, we will process your refund or exchange.
Refunds:
Refunds will be processed within 5-7 business days after we receive the returned item.
Refunds will be issued to the original payment method.
Shipping costs are non-refundable unless the return is due to our error.
Exchanges:
If you need to exchange an item, please contact our customer service team.
Exchanges are subject to product availability.
For orders, inquiries, or technical support, please contact us using the following details:
Email: hugo@cogeng.net
Phone: +86 18529131515
WhatsApp: +86 18529131515
Website: cogeng.net
Identify Your Part Number: Use your machine's parts manual or contact us for assistance.
Request a Quote: Send us an email or WhatsApp message with the part number and quantity.
Confirm Your Order: We will provide a proforma invoice for your confirmation.
Make Payment: We accept T/T, Western Union, and other payment methods.
Receive Your Order: We will ship your order promptly and provide tracking information.
Our team of experienced professionals is available to assist you with:
Part identification and compatibility verification.
Technical support and installation guidance.
Shipping and logistics inquiries.
Warranty and return requests.
Business Hours: Monday to Saturday, 9:00 AM – 6:00 PM (GMT+8)
End of Document
Disclaimer: This document is for informational purposes only. The manufacturer reserves the right to change specifications without notice. Always consult the official service manual for your specific machine before performing any repairs. Part numbers and compatibility are based on industry cross-reference data and may vary by region and production year.
*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
Excavator Solenoid Valve Excavator Wiring Harness Excavator Seal Kit
Excavator Pressure Sensor Excavator Revolution Sensor Excavator Water Temp Sensor
Excavator Control Panel Excavator Switch Parts Excavator Motors
Excavator Hydraulic Pump Excavator Other parts Excavator Engine Oil
