| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-99-26530-HSK | Internal Quality Standard QS-524 |
| Replaces Part No. | 707-99-26530, 7079926530 | Premium Alternative Replacement |
| Primary Seal Material | COGENG Polyurethane Plus™ | ISO 6072 (Enhanced) |
| Secondary Seal Material | COGENG Nitrile-Tech™ with PTFE | ISO 6072 (Enhanced) |
| Wiper Material | Polyurethane triple-lipped | ISO 6194 |
| O-Ring Material | HNBR (Hydrogenated Nitrile) | ISO 3601-1 |
| Wear Ring Material | PTFE-PEEK composite | ISO 6811 |
| Backup Ring Material | Reinforced nylon composite | ISO 1874-1 |
| Temperature Range | -45°C to +125°C (-49°F to +257°F) | ISO 2230 |
| Pressure Rating | Up to 42 MPa (6090 PSI) | ISO 10766-1 |
| Fluid Compatibility | All major hydraulic fluids | ISO 6743-4 |
| Enhanced Features | Anti-extrusion, Low-friction design | COGENG proprietary |
| Component | Material | Size Specification | Quantity | Enhanced Features |
|---|---|---|---|---|
| Main Piston Seal | Polyurethane Plus™ | 125mm ID x 9mm width | 1 | Anti-extrusion ribs |
| Rod Seal | Nitrile-Tech™ | 90mm ID x 7.5mm width | 1 | PTFE-impregnated |
| Buffer Seal | Polyurethane Plus™ | 125mm ID x 7mm width | 1 | Pressure-adaptive design |
| Wiper Seal | Triple-lipped PU | 90.5mm ID | 1 | Multi-stage filtration |
| Wear Bands | PTFE-PEEK composite | 125mm OD x 7mm width | 2 | Low friction, high load |
| O-Rings | HNBR | Various sizes AS568 | 8 | Superior heat resistance |
| Backup Rings | Reinforced nylon | Various sizes | 4 | Anti-collapse design |
| Guide Rings | Composite fabric | 125mm OD x 7mm width | 2 | Self-lubricating |
| Gland Gasket | HNBR | 95mm OD x 3mm CS | 1 | Enhanced compression |
| Dust Seal | Polyurethane | 90.3mm ID | 1 | Multi-lip design |
| Model Series | Specific Models | Cylinder Applications | Year Range | Performance Upgrade |
|---|---|---|---|---|
| Komatsu PC200 | PC200-8, PC200-8M0 | Boom, Arm, Bucket Cylinders | 2008-2015 | +15% longer service life |
| Komatsu PC210 | PC210-8, PC210LC-8 | Main Hydraulic Cylinders | 2009-2016 | Reduced friction |
| Komatsu PC220 | PC220-8, PC220LC-8 | All Hydraulic Cylinders | 2010-2017 | Improved pressure handling |
| Komatsu PC228 | PC228-3, PC228-5 | Swing Motor, Travel Motor | 2011-2018 | Enhanced temperature range |
| Feature | Standard Alternative | COGENG Premium Kit | Advantage |
|---|---|---|---|
| Service Life | 3,500-4,000 hours | 4,500-5,000 hours | +25% longer life |
| Temperature Range | -40°C to +110°C | -45°C to +125°C | Wider operating range |
| Pressure Rating | 35-38 MPa | Up to 42 MPa | Higher pressure capability |
| Friction Coefficient | 0.08-0.12 | 0.06-0.09 | Reduced energy consumption |
| Material Quality | Standard compounds | Enhanced proprietary materials | Superior durability |
| NO | Number | Name | Qty |
| 707-99-26530 | • KIT, GASKET | 1 | |
| 707-00-0Y901 | CYLINDER, ASSY. | 1 | |
| 1 | 707-76-45330 | • BUSHING | 1 |
| 2 | 721-58-55480 | • PISTON ROD | 1 |
| 3 | 707-29-90802 | • CYLINDER HEAD | 1 |
| 4 | 707-52-90300 | • BUSHING | 1 |
| 5 | 707-36-90570 | • PISTON | 1 |
| 6 | 707-67-36010 | • NUT | 1 |
| 7 | 721-11-90681 | • CYLINDER | 1 |
| 8 | 07179-12069 | • RING, SNAP | 1 |
| 9 | 707-76-45660 | • BUSHING | 1 |
| •• GASKET | 2 | ||
| •• O-RING | 2 | ||
| •• GASKET | 1 | ||
| •• O-RING | 1 | ||
| •• GASKET | 1 | ||
| •• GASKET | 1 | ||
| •• RING, WEAR | 1 | ||
| •• O-RING | 1 | ||
| •• PACKING ROD | 2 | ||
| •• GASKET | 1 |
1. The product title only says "for Komatsu." What specific machine or cylinder does this kit fit?
Part No. 707-99-26530 is a Komatsu OEM part number that corresponds to a specific hydraulic cylinder assembly, not a universal kit. Without the full OEM cylinder group context, the most common association for this number falls within medium-to-large Komatsu construction equipment, often linked to:
Dozer blade cylinders (lift, tilt, or angle) on models such as D65, D85, or D155 series
Excavator cylinders (boom, arm, or bucket) on PC200, PC300, or PC400 series machines
This is not a one-size-fits-all kit. You must verify the cylinder application by cross-referencing the complete OEM cylinder part number stamped on your machine. Supplying only the kit part number when ordering without machine context creates a risk of receiving the incorrect kit.
2. How do I determine exactly which cylinder this kit is for?
This is the most critical question for this part number. Follow these steps:
Do not rely on the kit part number alone. 707-99-26530 is a seal kit reference, not a cylinder assembly number.
Locate the stamped cylinder group number on the body (barrel) or gland of the cylinder you are rebuilding. This will be a Komatsu-format number, typically starting with 707-00-XXXXX, 707-01-XXXXX, or 707-02-XXXXX.
Identify the machine model and cylinder function. Provide the machine model (e.g., D85EX-15, PC300-7), serial number, and cylinder function (e.g., blade lift, boom, arm).
Verify with your supplier that 707-99-26530 is the correct kit for that cylinder group number and machine.
Ordering blind based solely on "707-99-26530" without machine/cylinder confirmation is the primary cause of incorrect kit deliveries.
3. Is this a genuine Komatsu part or an aftermarket kit?
This is a COGENG aftermarket replacement seal kit, manufactured to match the specifications of Komatsu OEM Part No. 707-99-26530. It is not a genuine Komatsu product. COGENG positions this as a "Premium" kit, indicating tighter tolerances and enhanced material formulations compared to standard aftermarket alternatives.
4. What is included in this kit?
As a comprehensive cylinder seal kit, it includes all soft components for a single cylinder overhaul:
Piston seal(s) – Primary pressure seal for the piston
Rod seal – Primary gland seal for the cylinder rod
Buffer ring – Protects the rod seal from pressure spikes
Dust wiper / scraper – Exclusion seal preventing external contaminant entry
Wear rings / guide bands – For piston-to-bore and rod-to-gland guidance and side-load absorption
Static O-rings and backup rings – For all gland, piston, and cylinder head sealing interfaces
Additional seals – As dictated by the specific cylinder design
5. What are the operating specifications?
Pressure rating: Up to 35 MPa (5,075 PSI) , standard for Komatsu heavy equipment implement circuits
Temperature range: -30°C to +110°C (-22°F to +230°F)
Seal materials: Premium-grade polyurethane (dynamic seals), NBR (static seals), composite wear rings
Fluid compatibility: Standard mineral-based Komatsu hydraulic oils (ISO VG 32, 46, 68)
6. What symptoms indicate the cylinder needs this rebuild kit?
Cylinder drift or sag under load
External hydraulic oil leakage around the rod, gland, or cylinder head
Slow or weak cylinder response
Hydraulic oil contamination (milky or dirty oil)
Uneven or jerky cylinder movement
7. Can this kit be used on multiple different Komatsu models?
No, not without explicit dimensional confirmation. Komatsu uses many different cylinder designs across its equipment range. The seal kit 707-99-26530 is engineered for one specific cylinder profile. It is not a universal kit and cannot be safely substituted across different cylinder part numbers unless a verified cross-reference confirms dimensional equivalence.
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