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| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-99-41270-HSK | Internal Quality Standard QS-523 |
| Replaces OEM Part No. | Komatsu 707-99-41270 | Aftermarket OEM Equivalent |
| 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 | -40°C to +120°C (-40°F to +248°F) | ISO 2230 |
| Pressure Rating | Up to 38 MPa (5510 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 | 140mm ID x 10mm width | 1 | Primary pressure sealing |
| Rod Seal | NBR with PTFE | 100mm ID x 8mm width | 1 | Dynamic rod sealing |
| Buffer Seal | Polyurethane | 140mm ID x 8mm width | 1 | Pressure peak protection |
| Wiper Seal | Polyurethane double-lipped | 100.5mm ID | 1 | Contaminant exclusion |
| Wear Bands | PTFE composite | 140mm OD x 8mm width | 2 | Piston guidance |
| O-Rings | Nitrile (NBR) | Various sizes AS568 | 9 | Static sealing |
| Backup Rings | Nylon 6.6 | Various sizes | 5 | Anti-extrusion support |
| Guide Rings | PTFE-filled fabric | 140mm OD x 8mm width | 2 | Bearing surface protection |
| Gland Gasket | NBR | 105mm OD x 3mm CS | 1 | Gland static seal |
| Dust Seal | Polyurethane | 100.3mm ID | 1 | Secondary contamination protection |
| Model Series | Specific Models | Cylinder Applications | Year Range | Serial Number Prefix |
|---|---|---|---|---|
| Komatsu PC300 | PC300-7, PC300-8 | Boom, Arm, Bucket Cylinders | 2006-2014 | A8C1, A8C2 |
| Komatsu PC350 | PC350-7, PC350-8 | Main Hydraulic Cylinders | 2007-2015 | A8D1, A8D2 |
| Komatsu PC400 | PC400-7, PC400-8 | All Hydraulic Cylinders | 2008-2016 | A8E1, A8E2 |
| Komatsu PC450 | PC450-7, PC450-8 | Swing Motor, Travel Motor | 2009-2017 | A8F1, A8F2 |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 140 mm | +0.15/-0.00 mm | Standard cylinder size |
| Rod Diameter | 100 mm | +0.00/-0.08 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 |
| 707-99-41270 | • KIT, GASKET | 1 | |
| 707-00-0Y941 | CYLINDER, ASSY. | 1 | |
| 1 | 707-76-60750 | • BUSHING | 1 |
| 2 | 721-58-60580 | • PISTON ROD | 1 |
| 3 | 707-71-91280 | • DOWEL | 1 |
| 4 | 07179-12074 | • RING, SNAP | 1 |
| 5 | 707-29-12500 | • CYLINDER HEAD | 1 |
| 6 | 707-52-90350 | • BUSHING | 1 |
| 7 | 707-36-12630 | • PISTON | 1 |
| 8 | 01314-20812 | • DOWEL | 1 |
| 9 | 707-71-60190 | • PIN | 1 |
| 10 | 04260-00635 | • BALL | 10 |
| 11 | 721-11-12931 | • CYLINDER | 1 |
| 12 | 707-76-60740 | • BUSHING | 2 |
| 13 | 707-87-25390 | • PLUG | 1 |
| 14 | 707-88-36770 | • GASKET | 1 |
| 15 | 707-80-13020 | • SPRING | 1 |
| 16 | 707-83-13040 | • VALVE | 1 |
| 17 | •• GASKET | 2 | |
| 18 | •• GASKET | 1 | |
| 19 | •• O-RING | 1 | |
| 20 | •• GASKET | 1 | |
| 21 | •• GASKET | 1 | |
| 22 | •• RING, WEAR | 1 | |
| 23 | •• O-RING | 1 | |
| 24 | •• O-RING | 1 | |
| 25 | •• PACKING ROD | 2 | |
| 26 | •• GASKET | 1 | |
| 27 | •• O-RING | 2 | |
| 28 | 21D-09-89140 | GREASE NIPPLE | 3 |
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...
