| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-99-53150-BM | Internal Quality Standard QS-517 |
| Replaces OEM Part No. | Komatsu 707-99-53150 | Direct OEM Replacement |
| Cross Reference | YNF16737 | Equivalent replacement |
| Piston Seal Material | Polyurethane (PU) Grade 95A | ISO 6072 |
| Rod 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 Band Material | PTFE-filled composite | ISO 6811 |
| Backup Ring Material | Nylon 6.6 | ISO 1874-1 |
| Temperature Range | -40°C to +120°C (-40°F to +248°F) | ISO 2230 |
| Pressure Rating | Up to 35 MPa (5075 PSI) | ISO 10766-1 |
| Fluid Compatibility | Komatsu Super Hydraulic Fluid, mineral oil, synthetic | 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 | 8 | Static sealing |
| Backup Rings | Nylon 6.6 | Various sizes | 4 | 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 |
| Manufacturer | Model Series | Specific Models | Year Range | Serial Number Range |
|---|---|---|---|---|
| Komatsu | WA320-1 | WA320-1 Standard | 1998-2003 | 50001-52000 |
| Komatsu | WA320-1 | WA320-1 Dash 3 | 1999-2004 | 52001-54000 |
| Komatsu | WA320-1 | WA320-1 Dash 5 | 2000-2005 | 54001-56000 |
| Related Models | WA320 Series | WA320-2, WA320-3 | 2001-2006 | Verify compatibility first |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 130 mm | +0.12/-0.00 mm | Boom cylinder |
| Piston Rod Diameter | 95 mm | +0.00/-0.06 mm | Chrome-plated rod |
| Stroke Length | 1,250 mm | ±4 mm | Boom lift range |
| Rod Finish | Hard chrome plated | Ra 0.2-0.4 μm | Surface roughness |
| Operating Pressure | 34.3 MPa (350 kg/cm²) | ±2% | System design pressure |
| Burst Pressure | 68.6 MPa (700 kg/cm²) | +10% | Safety margin |
| NO | Number | Name | Qty |
| 707-01-03511 | CYLINDER ASS'Y,LIFT | 2 | |
| 1 | 707-13-14360 | • CYLINDER | 1 |
| 2 | 707-76-75030 | • BUSHING | 1 |
| 3 | 707-27-14360 | • HAED.CYLINDER | 1 |
| 4 | 707-52-90520 | • BUSHING | 1 |
| 5 | 707-51-75030 | • PACKING,ROD | 1 |
| 6 | 144-63-94170 | • SEAL.DUST | 1 |
| 7 | 07179-13089 | • RING.SNAP | 1 |
| 8 | 07000-12135 | •• O-RING | 1 |
| 9 | 07146-02136 | • RING,BACK-UP | 1 |
| 10 | 01010-81455 | • BOLT | 12 |
| 11 | 01643-31445 | • WASHER | 12 |
| 12 | 707-59-75020 | ROD.PISTON | 1 |
| 13 | 07000-12060 | •• O-RING | 1 |
| 14 | 707-35-52900 | • RING,BACK-UP | 1 |
| 15 | 707-36-14210 | PISTON | 2 |
| 16 | 707-44-14180 | RING.PISTON | 1 |
| 17 | 07156-01417 | RING.WEAR | 1 |
| 18 | 707-40-16170 | SPACER | 1 |
| 19 | 01010-61240 | BOLT | 2 |
| 20 | 707-51-75640 | RING BUFFER | 2 |
| KIT | 707-99-53150 | SERVICE KIT | 6 |
Pre-Installation Requirements:
Safety Preparation
Completely depressurize hydraulic system
Secure loader on level ground with boom lowered
Support boom cylinder properly during disassembly
Wear appropriate personal protective equipment
Workspace Preparation
Clean cylinder exterior thoroughly
Use clean, organized work area
Verify kit completeness before starting
Prepare proper seal installation tools
Installation Procedure:
Disassembly Steps
Mark cylinder components for reassembly alignment
Carefully remove gland nut and piston assembly
Document seal orientation and position
Clean all components with non-petroleum solvent
Seal Installation
Lubricate all seals with clean hydraulic fluid
Use seal installation tools - avoid sharp instruments
Ensure proper orientation of directional seals
Verify seals are fully seated in grooves
Reassembly Specifications
Gland nut torque: 650-700 Nm (479-516 ft-lbs)
Ensure proper rod alignment during assembly
Cycle cylinder slowly to distribute fluid
Commissioning Procedure:
Initial Operation
Cycle cylinder several times without load
Check for external leakage at all connections
Monitor hydraulic fluid temperature
Verify smooth boom movement
Performance Verification
Check for drift under load
Verify cylinder speed matches specifications
Monitor for unusual noises or vibration
Conduct operational testing with lifting loads
| Performance Parameter | Value | Test Method |
|---|---|---|
| Seal Life Expectancy | 4,500 operating hours | ISO 7983 |
| Friction Coefficient | 0.07-0.11 | ASTM D1894 |
| Extrusion Resistance | 40 MPa sustained | ISO 1829 |
| Compression Set | <12% after 24h @ 100°C | ISO 815 |
| Abrasion Resistance | >65,000 cycles | ISO 4649 |
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