| Parameter | Specification | Testing Standard |
|---|---|---|
| Operating Pressure Range | 5-35 MPa (725-5,076 PSI) | ISO 10766 |
| Maximum Vertical Load | Up to 80,000 N (17,985 lbf) per cylinder | SAE J1516 modified |
| Temperature Range | -40°C to +125°C (-40°F to +257°F) | ASTM D2000 |
| Static Pressure Holding | 25 MPa for 24 hours with ≤3mm drift | ISO 10766 modified |
| Cylinder Bore Range | 120-180mm (application specific) | ISO 286-2 |
| Rod Diameter Range | 70-120mm (application specific) | ISO 286-2 |
| Seal Material Hardness | 88-95 Shore A (component specific) | ASTM D2240 |
| Pressure Cycle Rating | 200,000 cycles at 30 MPa | ISO 10767-1 |
| Shock Load Resistance | 45 MPa instantaneous (≤0.5 sec duration) | ISO 10767-1 |
| Friction Coefficient | 0.10-0.18 (optimized for lift operations) | ASTM D1894 modified |
| Contaminant Exclusion | >97% efficiency for >15µm particles | ISO 4548-12 |
| Drift Rate | ≤1.5 mm/minute at 30 MPa under full load | Proprietary test method |
| Abrasion Resistance | ≤65 mm³ loss (Taber, CS-17 wheel) | ASTM D4060 |
| Thermal Conductivity | 0.30-0.38 W/m·K | ASTM E1225 |
| Service Life | 3,500-5,500 hours in typical dozer service | Field validation data |
| Response Time | <0.4 seconds for full elevation change | Field validation data |
| Component | COGENG Part Number | Material | Dimensions | Special Features | Quantity |
|---|---|---|---|---|---|
| Lift Piston Seal | CG-LPS-24720-01 | HNBR with Carbon Fiber reinforcement | ID: 120-180mm (varies) | High-pressure, low compression set | 2 |
| Lift Rod Seal | CG-LRS-24720-01 | Polyurethane (AU) with PTFE coating | ID: 70-120mm (varies) | Exceptional pressure holding | 2 |
| Heavy-Duty Wiper | CG-HDW-24720-01 | Triple-density PU composite | Wiper specific | Quadruple-lip contamination control | 1 |
| Lift Wear Bands | CG-LWB-24720-01 | Bronze-PTFE-Graphite composite | Width: 25mm | Maximum load distribution | 2 |
| Shock-Absorption Backup | CG-SAB-24720-01 | Glass-PEEK-Teflon composite | Groove specific | Energy dissipating design | 4 |
| Component | Function | Material | Technical Specification |
|---|---|---|---|
| Load Compensator Ring | Adjusts seal pressure under vertical load | Microcellular PU with memory | 90 ± 3 Shore A |
| Vertical Guide System | Maintains alignment during lift operations | Oil-impregnated bronze with grooves | 0.20-0.30mm oil capacity |
| Impact Cushion Seal | Protects during ground contact shocks | Energy-absorbing microcellular PU | 0.10 second activation |
| Static Pressure Seal | Specialized for extended pressure holding | HNBR with low creep formulation | <0.5% compression set at 100°C |
| Component Type | Material | Quantity | Application |
|---|---|---|---|
| Static O-Rings | FKM (Grade 75) | 10 | Hydraulic connections |
| Port Seals | HNBR with steel anti-extrusion | 6 | High-pressure lift ports |
| Gland Gasket | Fiber-reinforced composite with sealing bead | 1 | Gland interface sealing |
| Thread Sealant | PTFE paste with temperature resistance | 1 kit | Fitting installation |
| Retaining Clips | Spring steel with corrosion coating | 2 | Component retention |
| Alignment Dowels | Hardened steel 4140 | 2 | Proper cylinder alignment |
| NO | Number | Name | Qty |
| K01 | 12Y-32-05050 | Service Kit, Shoe Bolt and Nut | |
| 12Y-32-15220 | • Nut | 50 | |
| 205-32-51211 | • Bolt | 50 | |
| K02 | 203-32-05131 | Service Kit, Shoe Bolt and Nut | |
| 203-32-51241 | • Bolt | 50 | |
| 203-32-61220 | • Nut | 50 | |
| K03 | 707-99-14990 | Seal Kit, Hydraulic Cylinder | |
| 02896-61009 | • O-ring | 2 | |
| 07000-12075 | • O-ring | 1 | |
| 07000-B2070 | • O-ring | 1 | |
| 07145-00040 | • Seal, Dust | 4 | |
| 707-35-10710 | • Ring, Back-up | 1 | |
| 707-39-75190 | • Ring, Wear | 1 | |
| 707-44-75150 | • Ring, Piston | 1 | |
| 707-51-40650 | • Ring, Buffer | 1 | |
| 707-51-40860 | • Packing, Rod | 1 | |
| 707-56-40740 | • Seal, Dust | 1 | |
| K04 | 707-99-24720 | Seal Kit, Hydraulic Cylinder | |
| 02896-61008 | • O-ring | 2 | |
| 07000-12090 | • O-ring | 1 | |
| 07000-13035 | • O-ring | 4 | |
| 07000-B2085 | • O-ring | 1 | |
| 07156-00912 | • Ring, Wear | 1 | |
| 707-35-10860 | • Ring, Back-up | 1 | |
| 707-44-90150 | • Ring, Piston | 1 | |
| 707-51-45650 | • Ring, Buffer | 1 | |
| 707-51-45860 | • Packing, Rod | 1 | |
| 707-56-45740 | • Seal, Dust | 1 | |
| K05 | 707-99-22300 | Seal Kit, Hydraulic Cylinder | |
| 02896-61009 | • O-ring | 2 | |
| 07000-12080 | • O-ring | 1 | |
| 07000-13035 | • O-ring | 4 | |
| 07000-B2075 | • O-ring | 1 | |
| 07156-00810 | • Ring, Wear | 2 | |
| 707-35-10760 | • Ring, Back-up | 1 | |
| 707-44-80150 | • Ring, Piston | 1 | |
| 707-51-40650 | • Ring, Buffer | 1 | |
| 707-51-40860 | • Packing, Rod | 1 | |
| 707-56-40740 | • Seal, Dust | 1 | |
| K06 | 707-99-34260 | Seal Kit, Hydraulic Cylinder | |
| 02896-61009 | • O-ring | 3 | |
| 07000-12105 | • O-ring | 1 | |
| 07000-B2100 | • O-ring | 1 | |
| 07145-00055 | • Seal, Dust | 4 | |
| 707-35-11010 | • Ring, Back-up | 1 | |
| 707-39-10510 | • Ring, Wear | 1 | |
| 707-44-10250 | • Ring, Piston | 1 | |
| 707-51-55650 | • Ring, Buffer | 1 | |
| 707-51-55860 | • Packing, Rod | 1 | |
| 707-56-55740 | • Seal, Dust | 1 |
⚠️ LIFT CYLINDER SPECIFIC REQUIREMENTS:
CRITICAL: Blade support must be certified for expected loads
ESSENTIAL: Follow Komatsu service manual torque sequences exactly
MANDATORY: Verify all clearances before final assembly
IMPERATIVE: Use only Grade 10.9 or better mounting hardware
⚠️ PERFORMANCE-DEPENDENT FACTORS:
Bore condition: Directly affects seal life and performance
Rod straightness: Critical for seal alignment and wear
Mounting alignment: Affects side loading and seal wear
Hydraulic fluid cleanliness: ISO 4406 17/15/12 or better required
⚠️ SAFETY CONSIDERATIONS:
Blade can fall catastrophically if not properly supported
Hydraulic pressure can be retained even after system shutdown
Heavy components require proper lifting equipment and techniques
Track movement possible during service if not properly blocked
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