| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-878010285-HSK | Internal Quality Standard QS-511 |
| Replaces OEM Part No. | Komatsu 878010285 | Direct OEM Replacement |
| Primary Seal Material | Polyurethane (PU) Grade 95A | ISO 6072 |
| Secondary Seal Material | Nitrile (NBR) with PTFE fill | ISO 6072 |
| Wiper Material | Polyurethane double-lipped | ISO 6194 |
| O-Ring Material | Nitrile (NBR) 70 Durometer | ISO 3601-1 |
| Wear Ring Material | PTFE-filled composite | ISO 6811 |
| Backup Ring Material | Nylon 6.6 | ISO 1874-1 |
| Temperature Range | -45°C to +120°C (-49°F to +248°F) | ISO 2230 |
| Pressure Rating | Up to 42 MPa (6090 PSI) | ISO 10766-1 |
| Fluid Compatibility | Komatsu Super Hydraulic Fluid, mineral oil, synthetic, biodegradable | ISO 6743-4 |
| Shelf Life | 5 years in original packaging | ISO 2230 |
| Component | Material | Size Specification | Quantity | Function |
|---|---|---|---|---|
| Main Piston Seal | Polyurethane | 130mm ID x 10mm width | 1 | Primary pressure sealing |
| Rod Seal | NBR with PTFE | 95mm ID x 8mm width | 1 | Dynamic rod sealing |
| Buffer Seal | Polyurethane | 130mm ID x 8mm width | 1 | Pressure peak protection |
| Wiper Seal | Polyurethane double-lipped | 95.5mm ID | 1 | Contaminant exclusion |
| Wear Bands | PTFE composite | 130mm OD x 8mm width | 2 | Piston guidance |
| O-Rings | Nitrile (NBR) | Various sizes AS568 | 10 | Static sealing |
| Backup Rings | Nylon 6.6 | Various sizes | 5 | Anti-extrusion support |
| Guide Rings | PTFE-filled fabric | 130mm OD x 8mm width | 2 | Bearing surface protection |
| Gland Gasket | NBR | 100mm OD x 3mm CS | 1 | Gland static seal |
| Model Series | Specific Models | Cylinder Applications | Year Range | Serial Number Prefix |
|---|---|---|---|---|
| Komatsu PC200 | PC200-8, PC200-8M0 | Boom, Arm, Bucket Cylinders | 2008-2015 | A8C1, A8C2 |
| Komatsu PC210 | PC210-8, PC210-8M0 | Main Hydraulic Cylinders | 2009-2016 | A8D1, A8D2 |
| Komatsu PC220 | PC220-8, PC220-8M0 | All Hydraulic Cylinders | 2010-2017 | A8E1, A8E2 |
| Komatsu PC228 | PC228-3, PC228-5 | Boom and Arm Cylinders | 2011-2018 | A8F1, A8F2 |
| Komatsu PC240 | PC240-8, PC240-8M0 | Swing Motor, Travel Motor | 2012-2019 | A8G1, A8G2 |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 130 mm | +0.12/-0.00 mm | Standard cylinder size |
| Rod Diameter | 95 mm | +0.00/-0.06 mm | Chrome-plated rod |
| Operating Pressure | 34.3 MPa (350 kg/cm²) | ±2% | System design pressure |
| Burst Pressure | 68.6 MPa (700 kg/cm²) | +10% | Safety margin |
| Fluid Temperature | -20°C to +80°C | N/A | Operating range |
| Rod Hardness | 60-65 HRC | ±2 HRC | Chrome plating hardness |
| NO | Number | Name | Qty |
| 37C-6C-17200 | LIFT CYLINDER, ASSY. | 1 | |
| 1 | 37C-6C-17A50 | • PISTON ROD | 1 |
| 2 | 3F1099611 | • BUSHING | 2 |
| 3 | 37C-6C-11B30 | • CYLINDER HEAD | 1 |
| 4 | 500466150 | • PISTON | 1 |
| 5 | 801920113 | • NUT | 1 |
| 6 | 37C-6C-17B30 | • CYLINDER | 1 |
| 7 | 855051014 | • O-RING | 2 |
| 878010285 | • KIT, GASKET | 1 | |
| 8 | 3F1099612 | •• GASKET | 4 |
| 9 | 855661238 | •• RING, SNAP | 1 |
| 10 | 855661153 | •• GASKET | 1 |
| 11 | 855661154 | •• GASKET | 1 |
| 12 | 855661215 | •• O-RING | 1 |
| 13 | 855661200 | •• RING, WEAR | 1 |
| 14 | 855661215 | •• O-RING | 1 |
| 15 | 855661201 | •• GASKET | 1 |
| 16 | 855661202 | •• PACKING ROD | 1 |
| Performance Parameter | Value | Test Method |
|---|---|---|
| Seal Service Life | 5,000 operating hours | ISO 7983 |
| Friction Coefficient | 0.06-0.10 | ASTM D1894 |
| Extrusion Resistance | 45 MPa sustained | ISO 1829 |
| Compression Set | <12% after 24h @ 100°C | ISO 815 |
| Abrasion Resistance | >75,000 cycles | ISO 4649 |
| Low Temperature Flexibility | -45°C pass | ISO 2929 |
Preventive Maintenance Schedule:
Visual inspection: Every 500 operating hours
Leakage check: Monthly or 250 hours
Performance monitoring: Daily operational checks
Fluid analysis: Every 2,000 hours
Complete cylinder inspection: Every 4,000 hours
Troubleshooting Common Issues:
External Leakage: Verify seal installation and rod surface condition (Ra < 0.4 μm)
Internal Leakage: Check piston seal integrity and cylinder bore wear
Slow Operation: Inspect for contamination or incorrect fluid viscosity
Jerky Movement: Check for air in system or damaged wear bands
Overheating: Verify proper lubrication and check for excessive friction
