| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-99-32070-SWG | Internal Quality Standard QS-526 |
| Replaces OEM Part No. | Komatsu 707-99-32070 | Direct OEM 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 +110°C (-40°F to +230°F) | ISO 2230 |
| Pressure Rating | Up to 32 MPa (4640 PSI) | ISO 10766-1 |
| Rotation Speed | 8-12 RPM maximum | Manufacturer Specification |
| 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 | 100mm ID x 8mm width | 1 | Primary pressure sealing |
| Rod Seal | NBR with PTFE | 70mm ID x 6mm width | 1 | Dynamic rod sealing |
| Buffer Seal | Polyurethane | 100mm ID x 6mm width | 1 | Pressure peak protection |
| Wiper Seal | Polyurethane double-lipped | 70.5mm ID | 1 | Contaminant exclusion |
| Wear Bands | PTFE composite | 100mm OD x 6mm width | 2 | Piston guidance |
| O-Rings | Nitrile (NBR) | Various sizes AS568 | 7 | Static sealing |
| Backup Rings | Nylon 6.6 | Various sizes | 4 | Anti-extrusion support |
| Guide Rings | PTFE-filled fabric | 100mm OD x 6mm width | 2 | Bearing surface protection |
| Gland Gasket | NBR | 75mm OD x 2.5mm CS | 1 | Gland static seal |
| Rotary Seal | Polyurethane | Special design | 1 | Swing rotation sealing |
| Manufacturer | Model Series | Specific Models | Year Range | Swing Capacity |
|---|---|---|---|---|
| Komatsu | WB146-5 | WB146-5, WB146-5N | 2005-2010 | 180° rotation |
| Komatsu | WB97S-5E0 | WB97S-5E0 Standard | 2006-2011 | 180° continuous swing |
| Komatsu | WB93S-5 | WB93S-5, WB93S-5E | 2007-2012 | 185° maximum rotation |
| Komatsu | WB97R-5E0 | WB97R-5E0, WB97R-5 | 2008-2013 | 190° with auto-leveling |
| Related Models | WB Series | WB140, WB150 compatible variants | 2004-2009 | Verify compatibility |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 100 mm | +0.10/-0.00 mm | Swing cylinder |
| Piston Rod Diameter | 70 mm | +0.00/-0.05 mm | Chrome-plated rod |
| Stroke Length | 680 mm | ±3 mm | Swing arc length |
| Rod Finish | Hard chrome plated | Ra 0.2-0.4 μm | Surface roughness |
| Operating Pressure | 27.4 MPa (280 kg/cm²) | ±2% | System design pressure |
| Rotation Range | 180° standard | ±2° | Backhoe swing range |
| Swing Torque | 12,500 Nm | ±5% | Maximum rotation force |
| Swing Speed | 10 RPM at max flow | ±10% | Rotation velocity |
| NO | Number | Name | Qty |
| 707-99-32070 | • KIT, GASKET | 1 | |
| 707-02-07731 | CYLINDER, ASSY. | ||
| 707-02-07730 | CYLINDER, ASSY. | 2 | |
| 1 | 707-76-55570 | • BUSHING | 1 |
| 2 | 707-58-50H70 | • PISTON ROD | 1 |
| 3 | 07179-12062 | • RING, SNAP | 1 |
| 4 | 707-29-10700 | • CYLINDER HEAD | 1 |
| 5 | 707-52-90250 | • BUSHING | 1 |
| 6 | 707-36-10780 | • PISTON | 1 |
| 7 | 01310-00820 | • DOWEL | 1 |
| 8 | 707-76-50930 | • BUSHING | 2 |
| 9 | 707-12-10230 | • CYLINDER | 1 |
| 10 | 01310-00812 | • DOWEL | 1 |
| 11 | 707-71-10120 | • THRUST WASHER | 1 |
| 12 | 707-81-30080 | • THRUST WASHER | 1 |
| 13 | 707-73-03010 | • RING, SNAP | 1 |
| 14 | 707-71-50200 | • CYLINDER | 1 |
| 15 | •• GASKET | 1 | |
| 16 | •• O-RING | 1 | |
| 17 | •• GASKET | 1 | |
| 18 | •• GASKET | 1 | |
| 19 | •• RING, WEAR | 1 | |
| 20 | •• O-RING | 1 | |
| 21 | •• RING, WEAR | 1 | |
| 22 | •• O-RING | 1 | |
| 23 | •• GASKET | 1 | |
| 24 | •• PACKING ROD | 1 | |
| 25 | •• O-RING | 3 | |
| 26 | •• O-RING | 1 | |
| 27 | 21D-09-89140 | GREASE NIPPLE | 1 |
| Performance Parameter | Value | Test Method | Importance |
|---|---|---|---|
| Seal Life Expectancy | 3,000 operating hours | ISO 7983 | Maintenance planning |
| Friction Coefficient | 0.07-0.11 | ASTM D1894 | Swing smoothness |
| Extrusion Resistance | 34 MPa sustained | ISO 1829 | Pressure handling |
| Rotation Accuracy | ±2° from center | Laser alignment | Operational precision |
| Swing Drift | <5° in 10 minutes | Load testing | Stability during operation |
| Emergency Stop | Full stop in <2 seconds | Dynamic testing | Safety requirement |
Q1: Which Komatsu excavator models use the 707-99-32070 premium swing cylinder seal kit?
A: This premium seal kit is designed for specific Komatsu excavator swing cylinders requiring OEM part number 707-99-32070 (also listed as 7079932070). Please verify compatibility with your machine model and cylinder part number before ordering.
Q2: What is a swing cylinder and why is this seal kit important?
A: The swing cylinder controls the excavator's upper structure rotation (swing) left and right. A quality seal kit prevents hydraulic leaks, eliminates swing drift, and restores smooth rotational power.
Q3: What makes this a "premium" swing cylinder seal kit?
A: The premium kit features advanced polyurethane seals and high-grade rubber compounds engineered to withstand extreme hydraulic pressures, rotational friction, and harsh operating conditions for extended service life.
Q4: Is this an OEM or aftermarket seal kit?
A: It is an OEM-grade premium replacement kit, manufactured to meet or exceed original Komatsu quality standards for sealing performance, durability, and precise fit.
Q5: How do I purchase the COGENG 707-99-32070 premium swing cylinder seal kit?
A: Contact us with your Komatsu excavator model and swing cylinder details for fitment verification, then order directly through our website or sales team for fast shipping.
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