| Parameter | Specification | Testing Standard |
|---|---|---|
| Operating Pressure Range | 5-28 MPa (725-4,061 PSI) | ISO 10766 |
| Maximum Side Load | 10% of rod diameter at 20 MPa | SAE J1516 modified |
| Temperature Range | -30°C to +110°C (-22°F to +230°F) | ASTM D2000 |
| Bore Diameter (WB140-2 Specific) | 100mm (±0.020mm) | ISO 286-2 |
| Rod Diameter (WB140-2 Specific) | 60mm (-0/+0.012mm) | ISO 286-2 |
| Seal Material Hardness | 85-92 Shore A (component specific) | ASTM D2240 |
| Pressure Cycle Rating | 200,000 cycles at 20 MPa | ISO 10767-1 |
| Friction Coefficient | 0.12-0.20 (optimized for digging cycles) | ASTM D1894 modified |
| Contaminant Exclusion | >95% efficiency for >15µm particles | ISO 4548-12 |
| Drift Rate | ≤2 mm/minute at 20 MPa, 10° side load | Proprietary test method |
| Abrasion Resistance | ≤65 mm³ loss (Taber, CS-17 wheel) | ASTM D4060 |
| Thermal Conductivity | 0.28-0.35 W/m·K | ASTM E1225 |
| Service Life | 3,500-5,000 hours in typical backhoe service | Field validation data |
| Response Time | <0.4 seconds for full boom movement | Field validation data |
| Component | COGENG Part Number | Material | Dimensions | Special Features | Quantity |
|---|---|---|---|---|---|
| Boom Piston Seal | CG-BPS-489-01 | HNBR with Kevlar® reinforcement | ID: 100mm (WB140-2 specific) | Asymmetric design for digging loads | 2 |
| Boom Rod Seal | CG-BRS-489-01 | Polyurethane (EU) with graphite | ID: 60mm (WB140-2 specific) | Low stiction, high wear resistance | 2 |
| Heavy-Duty Wiper | CG-HDW-489-01 | Dual-density PU with scraper | Wiper specific | Triple-lip contamination exclusion | 1 |
| Boom Wear Bands | CG-BWB-489-01 | Bronze-PTFE-carbon composite | Width: 18mm | Extra width for stability | 2 |
| Side-Load Backup Rings | CG-SLB-489-01 | Glass-PEEK composite | Groove specific | Variable thickness for load compensation | 4 |
| Component | Function | Material | WB140-2 Specification |
|---|---|---|---|
| Digging Load Compensator | Adjusts seal pressure under digging loads | Microcellular PU | 88 ± 3 Shore A |
| Boom Angle Guide | Maintains alignment during boom movements | Oil-impregnated bronze | 0.15-0.25mm oil capacity |
| Shock Absorption Cushion | Protects during impact loads | Energy-absorbing TPU | 0.15 second activation |
| Linkage Seal | Pivot point protection | HNBR with fabric backing | WB140-2 specific linkage geometry |
| Component Type | Material Specification | Quantity | WB140-2 Application |
|---|---|---|---|
| Static O-Rings | FKM (Grade 70) | 6 | Hydraulic connections |
| Port Seals | HNBR with anti-extrusion | 4 | High-pressure boom ports |
| Gland Gasket | Fiber-reinforced composite | 1 | Gland interface sealing |
| Thread Sealant | PTFE paste | 1 kit | Fitting installation |
| Retaining Clips | Spring steel | 2 | Component retention |
Model-Specific Workspace Requirements:
Refer to Komatsu Service Manual for WB140-2
Special attention to boom support and lockout
Hydraulic system depressurization sequence
Proper stabilizer deployment and machine stabilization
Required WB140-2 Special Tools:
Komatsu special tool ST-WB140-2 (boom cylinder specific)
Boom locking fixture or proper support equipment
Linkage pin removal tools
Backhoe specific torque wrench adapters
Safety Protocols for Backhoe Service:
Follow Komatsu WB140-2 safety procedures exactly
Boom must be secured in lowered position
Hydraulic system lockout verified
Stabilizers deployed and locked during service
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