Technical Constants & Performance Data
| Parameter | Value / Specification |
|---|---|
| Maximum Pressure | Up to 5,220 PSI (360 Bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Mineral-based & synthetic hydraulic oils, Komatsu Super Hydraulic Fluid (KSHV) |
| Primary Seal Material | Polyurethane (AU/CU) & Nitrile Rubber (NBR) |
| Seal Hardness | 88-92 Shore A (Dynamic Seals), 70 Shore A (Static O-Rings) |
| Standard Compliance | Manufactured to meet or exceed Komatsu DHTA (Dantotsu High-Tech Advance) specifications. |
Exact Model Compatibility
| Komatsu Machine Models | Applicable Cylinders |
|---|---|
| Komatsu PC130-7, PC138US-7 | Boom Cylinder, Arm Cylinder |
| Komatsu PC200-7, PC200-8, PC210-7, PC210-8 | Boom Cylinder, Arm Cylinder, Bucket Cylinder |
| Komatsu PC220-7, PC228US-7, PC228US-8 | Boom Cylinder, Arm Cylinder, Bucket Cylinder |
| Note: | This kit is designed as a direct replacement for Komatsu OEM part number 707-98-15610. It is specific to the cylinder gland and piston sealing configurations of the models listed. Always verify the machine model, cylinder type (Boom/Arm/Bucket), and cylinder serial number before installation. |
Component Specifications Table
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 90 Shore A | Main dynamic seal for piston pressure |
| Rod Seal (Glyd Ring) | PTFE Composite & NBR | Black/Brown | N/A | Primary rod seal, low friction |
| Wiper/Scraper (Double Lip) | Polyurethane (PU) | Black | 85 Shore A | Contaminant exclusion & secondary wiping |
| Buffer Seal | Polyurethane (CU) | Black | 88 Shore A | Pressure dampening for rod seal |
| O-Ring Set (Various) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static sealing for gland, ports, plugs |
| Wear Ring/Guide Band | Filled PTFE (Glass-filled) | Dark Brown | N/A | Piston guidance, prevents metal contact |
| Backup Ring (for O-Rings) | Nylon (PA) | Tan/White | N/A | Prevents O-ring extrusion under pressure |
Installation decomposition diagram
Safe Depressurization & Support: Fully lower the implement to the ground to relieve hydraulic pressure. Secure the cylinder rod and mechanically support the implement to prevent accidental movement.
Ultra-Clean Environment: Perform disassembly and assembly in a dedicated, clean area. Use a parts washer and lint-free wipes.
Sequential Disassembly: Carefully disassemble the gland. Document the order, orientation, and placement of every component with photos or notes.
Mandatory Metal Inspection: Use a micrometer and bore gauge to check the rod (for scratches, pitting, or scoring) and the cylinder tube ID (for wear, tapering, or scoring). Replace damaged metal components.
Proper Seal Installation: Lubricate all new seals with clean hydraulic fluid. Use seal installation tools (cone tools, sleeves) to guide seals over threads and sharp edges without damage. Ensure seals are seated squarely in their grooves.
Precision Torquing: During reassembly, use a calibrated torque wrench. Follow Komatsu's specified torque sequence and values for gland bolts, tie-rods, or end caps precisely.
Compatibility & Application Data
| Application Sector | Primary Equipment | Symptoms Addressed by This Kit |
|---|---|---|
| Excavation & Earthmoving | Komatsu Hydraulic Excavators (PC Series) | Cylinder drift (boom/arm drop), visible hydraulic oil leakage from rod gland, slow or weak cylinder operation, increased oil consumption. |
| Construction & Demolition | Implement Cylinders (Boom, Arm, Bucket) | Loss of digging force, inability to hold load, hydraulic system overheating due to internal leakage. |
| Heavy Equipment Maintenance | Planned Rebuilds & Emergency Repairs | Restores factory sealing performance, prevents environmental contamination from leaks, and is a cost-effective alternative to complete cylinder replacement. |
Frequently Asked Questions
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?
A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.
A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.
A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?
A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.
A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.
A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.
A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
A : Which payment terms can you accept?
Q : Paypal. Western Union, Bank Transfer, T/T...
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