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| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-98-25090-BM | Internal Quality Standard QS-521 |
| Replaces OEM Part No. | Komatsu 707-98-25090 | 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 |
| 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 | 120mm ID x 9mm width | 1 | Primary pressure sealing |
| Rod Seal | NBR with PTFE | 85mm ID x 7mm width | 1 | Dynamic rod sealing |
| Buffer Seal | Polyurethane | 120mm ID x 7mm width | 1 | Pressure peak protection |
| Wiper Seal | Polyurethane double-lipped | 85.5mm ID | 1 | Contaminant exclusion |
| Wear Bands | PTFE composite | 120mm OD x 7mm 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 | 120mm OD x 7mm width | 2 | Bearing surface protection |
| Gland Gasket | NBR | 90mm OD x 3mm CS | 1 | Gland static seal |
| Manufacturer | Model Series | Specific Models | Year Range | Application |
|---|---|---|---|---|
| Komatsu | WB140-2 | WB140-2 Standard | 1998-2002 | Backhoe Boom Cylinder |
| Komatsu | WB140-2 | WB140-2N, WB140-2E | 1999-2003 | Main Lift Cylinder |
| Komatsu | WB140 Series | WB140-2S, WB140-2H | 2000-2004 | Excavation Boom |
| Related Models | WB140 Series | WB140-1, WB140-3 | 1997-2001 | Verify compatibility |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 120 mm | +0.12/-0.00 mm | Boom cylinder |
| Piston Rod Diameter | 85 mm | +0.00/-0.06 mm | Chrome-plated rod |
| Stroke Length | 1,150 mm | ±4 mm | Boom lift range |
| 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 |
| Lifting Capacity | 3,500 kg @ full extension | ±5% | Maximum boom load |
| Breakout Force | 9,800 kgf | ±5% | Digging force capacity |
| NO | Number | Name | Qty |
| KIT | 707-98-25090 | SERVICE KIT, LIFT | 2 |
| CYL | 707-00-80C10 | CYLINDER ASSY, LIFT | 2 |
| 1 | 721-11-80500 | • CYLINDER | 1 |
| 2 | 07144-10505 | • BUSHING | 1 |
| 3 | 707-29-80740 | • HEAD, CYLINDER | 1 |
| 4 | 07177-05030 | • BUSHING | 1 |
| 5 | 707-51-50211 | • PACKING, ROD (KIT) | 1 |
| 6 | 176-63-92240 | • SEAL, DUST (KIT) | 1 |
| 7 | 07179-12062 | • RING, SNAP | 1 |
| 8 | 07000-12080 | • O-RING (KIT) | 1 |
| 9 | 07146-02076 | • RING, BACK-UP (KIT) | 1 |
| 10 | 07000-12075 | • O-RING (KIT) | 1 |
| 11 | 721-58-50961 | • ROD, PISTON | 1 |
| 12 | 707-76-45550 | • BUSHING | 1 |
| 13 | 707-36-80370 | • PISTON | 1 |
| 14 | 707-44-80180 | • RING, PISTON (KIT) | 1 |
| 15 | 07156-00810 | • RING, WEAR | 1 |
| 16 | 01580-03629 | • NUT | 1 |
| Performance Parameter | Value | Test Method |
|---|---|---|
| Seal Life Expectancy | 3,500 operating hours | ISO 7983 |
| Friction Coefficient | 0.07-0.11 | ASTM D1894 |
| Extrusion Resistance | 35 MPa sustained | ISO 1829 |
| Compression Set | <13% after 24h @ 100°C | ISO 815 |
| Abrasion Resistance | >55,000 cycles | ISO 4649 |
| Low Temp Performance | -40°C operational | ISO 2929 |
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?
A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.
A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.
A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?
A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.
A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.
A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.
A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
A : Which payment terms can you accept?
Q : Paypal. Western Union, Bank Transfer, T/T...
