| Parameter | Specification Range | Testing Standard |
|---|---|---|
| Pressure Range | 5-35 MPa (725-5,076 PSI) | ISO 10766 |
| Bore Compatibility | 100-160mm (3.94-6.30 inches) | ISO 286-2 |
| Rod Compatibility | 60-100mm (2.36-3.94 inches) | ISO 286-2 |
| Temperature Range | -30°C to +120°C (-22°F to +248°F) | ASTM D2000 |
| Seal Material Hardness | 80-92 Shore A (adaptive design) | ASTM D2240 |
| Friction Coefficient | 0.12-0.22 (pressure optimized) | ASTM D1894 modified |
| Compression Set | ≤ 10% (70 hours @ 110°C) | ASTM D395 Method B |
| Tensile Strength | 15-20 MPa (2,176-2,901 PSI) | ASTM D412 |
| Elongation at Break | 250-320% | ASTM D412 |
| Abrasion Resistance | ≤ 70 mm³ loss (Taber, CS-17) | ASTM D4060 |
| Chemical Compatibility | Compatible with AW32, AW46, synthetic fluids | ASTM D471 |
| Service Life | 3,000-5,000 hours (application dependent) | Field validation data |
| Leakage Rate | ≤ 0.5 ml/hour at 25 MPa | ISO 10766 |
| Component | COGENG Part Number | Material | Size Range | Adaptive Feature | Quantity |
|---|---|---|---|---|---|
| Universal Piston Seal | CG-UPS-35720-01 | HNBR/PU hybrid composite | ID: 100-160mm | Self-sizing lip geometry | 2 |
| Adaptive Rod Seal | CG-ARS-35720-01 | Triple-layer composite | ID: 60-100mm | Pressure-responsive design | 2 |
| Multi-Application Wiper | CG-MAW-35720-01 | Dual-density PU | 60-110mm range | Adjustable interference fit | 1 |
| Variable Wear Bands | CG-VWB-35720-01 | PTFE-bronze matrix | 3-5mm thickness range | Stackable for proper clearance | 4 |
| Universal Backup Rings | CG-UBR-35720-01 | Glass-filled PTFE | Multiple groove sizes | Split design with overlap | 6 |
| Component Group | Included Variations | Selection Guide | Application |
|---|---|---|---|
| O-Ring Kit | 10 sizes (AS568-006 to -225) | Color-coded by size | Static sealing points |
| Cushion Seals | 2 types (standard/heavy) | Choose based on cylinder type | Stroke-end protection |
| Gland Seals | Universal fit design | One-size-fits-most | Gland sealing |
| Port Seals | 4 sizes (common port threads) | Match to existing ports | Hydraulic connections |
| Adaptation Component | Function | Included Sizes | Usage |
|---|---|---|---|
| Sizing Shims | Adjust seal groove depth | 0.1, 0.2, 0.3, 0.5mm | Compensate for wear |
| Spacer Rings | Adjust piston width | 1, 2, 3mm thickness | Proper seal positioning |
| Backup Ring Adjusters | Fine-tune backup ring fit | 3 variations | Optimal anti-extrusion |
| Installation Cones | Protect during installation | Adjustable diameter | Multiple size compatibility |
Universal Workspace Requirements:
Clean environment (ISO 4406 Class 8 minimum)
Adequate lighting: 500 lux minimum
Temperature: 15-30°C (59-86°F)
Basic tool availability
Required Tools:
Standard hand tool set
Torque wrench (calibrated)
Micrometer or calipers
Basic measuring tools
Clean rags and solvent
Safety Protocols:
System depressurization
Equipment properly supported
Personal protective equipment
Adequate ventilation
1. What Komatsu models is this seal kit compatible with?
This is marketed as a "Universal" cylinder seal kit. While designed to cover a broad range of Komatsu standard hydraulic cylinders, it is critical to verify dimensions. Commonly, this kit fits cylinders on models such as D65, D85, D155 dozers, and PC200/PC300 series excavators, but you must cross-check the specific cylinder part number (e.g., 707-00-XXXXX) on your machine for a guaranteed fit.
2. Is this a complete kit for rebuilding one cylinder assembly?
Yes. This is a complete set to service a single hydraulic cylinder. Typically, it includes the piston seal, rod seal, buffer seal, dust wiper, O-rings, backup rings, and wear rings required for a full gland and piston overhaul.
3. Are the seals made of polyurethane (PU) or NBR (Nitrile)?
COGENG kits typically use a combination of materials for optimal performance. The primary pressure seals (U-cups, buffer seals) are made of high-performance polyurethane for durability. O-rings are NBR (Nitrile Butadiene Rubber), and wear rings are often PTFE-infused or phenolic resin. Confirm with the supplier if your application requires specific material certifications.
4. What is the temperature and pressure rating for this kit?
Standard kits are generally rated for operating temperatures of -30°C to +110°C (-22°F to +230°F) and working pressures up to 35 MPa (5,075 PSI) , which meets or exceeds standard Komatsu hydraulic system requirements.
5. Is this a genuine Komatsu part, or an aftermarket equivalent?
This is an aftermarket replacement kit manufactured by COGENG. It is produced to match OEM specifications (such as Komatsu Part No. 707-99-35720) but is not a genuine Komatsu part. It is a cost-effective alternative to genuine OEM kits.
6. How can I be sure this kit will fit my specific cylinder?
The "Universal" designation carries some risk. To guarantee fitment, please provide the diameter of your cylinder rod and piston, or the OEM cylinder group number stamped on the cylinder body. Relying solely on the machine model can lead to errors due to year variations and aftermarket cylinder swaps.
7. What is the typical shelf life and storage recommendation?
When stored unopened in a cool, dry environment away from direct sunlight and ozone sources, the recommended shelf life is typically 5–7 years. Always inspect the seals for flexibility and discoloration before installation if the kit is older.
8. Do you provide an installation guide or diagram?
The kit usually comes with a schematic/diagram showing the correct stacking order of the seals within the gland and piston. COGENG does not typically provide a full manual. We recommend using Komatsu's Shop Manual for your specific machine for the rebuild procedure.
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