- CN
| 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. |
| 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 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 |
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.
| 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. |
