- EN
| Parameter | Specification |
|---|---|
| Product Name | Komatsu Hydraulic Cylinder Seal Kit |
| COGENG Part Number | 707-98-28600 (7079828600) |
| OEM Equivalent | Komatsu 707-98-28600, 7079828600 |
| Rod Diameter | 65 mm |
| Bore Diameter | 95 mm |
| Product Type | Hydraulic Cylinder Seal Kit |
| Application | Blade lift, tilt, ripper cylinders |
| Kit Type | Complete overhaul seal kit |
| Material | Iron + Rubber (seals: PU, NBR, HNBR, PTFE) |
| Packing | PP bag inside, carton box outside |
| Place of Origin | Guangdong, China |
| Brand Name | COGENG |
| Certification | ISO9001 |
| Supply Capacity | 500 PCS |
| Brand | Part Number |
|---|---|
| COGENG | 707-98-28600, 7079828600 |
| Komatsu | 707-98-28600, 7079828600 |
| Interchange | 707-98-28601, 707-98-28602 |
| Parameter | Specification |
|---|---|
| Rod Diameter | 65 mm (2.56 inches) |
| Bore Diameter | 95 mm (3.74 inches) |
| Cylinder Types | Blade lift, blade tilt, ripper cylinders |
| Typical Stroke | 800-1200 mm (application dependent) |
| Component | Material Grade | Hardness | Temperature Range |
|---|---|---|---|
| Piston Seals | Polyurethane (PU) | 90-92 Shore A | -35°C to +110°C |
| Rod Seals | NBR + PTFE coating | 85 Shore A | -40°C to +120°C |
| Wiper Seals | Polyurethane (PU) | 88-90 Shore A | -35°C to +100°C |
| O-Rings | HNBR (Zetpol) | 70 Shore A | -40°C to +150°C |
| Wear Rings | PTFE + Bronze filler | — | -50°C to +200°C |
| Backup Rings | Nylon 66 (Glass filled) | — | -40°C to +120°C |
| Buffer Seals | Polyurethane | 90 Shore A | -35°C to +110°C |
| Parameter | Rating |
|---|---|
| Maximum Pressure | 350 bar (5,075 psi) |
| Operating Temperature | -40°C to +120°C |
| Fluid Compatibility | Mineral oil, synthetic hydraulic fluids |
| Seal Speed Rating | Up to 0.5 m/s |
| Service Life | 5,000+ operating hours |
| Item | Description | Quantity | Material |
|---|---|---|---|
| 1 | Piston Seal (95mm bore) | 2 | Polyurethane |
| 2 | Rod Seal (65mm rod - Step-cut) | 2 | NBR + PTFE |
| 3 | Wiper Seal (Double-lipped) | 2 | Polyurethane |
| 4 | Buffer Seal | 2 | Polyurethane |
| 5 | Wear Ring (Piston - 95mm) | 2 | PTFE Composite |
| 6 | Wear Ring (Gland - 65mm) | 2 | PTFE Composite |
| 7 | O-Ring (Gland to barrel) | 2 | HNBR |
| 8 | O-Ring (Piston to rod) | 2 | HNBR |
| 9 | O-Ring (End cap) | 4 | HNBR |
| 10 | Backup Ring (Various sizes) | 4 | Nylon 66 |
| 11 | Dust Seal (Rod wiper - 65mm) | 2 | Polyurethane |
| Parameter | Specification |
|---|---|
| Model | Komatsu D65PX-12 Bulldozer |
| Type | Crawler Dozer (Patrol/PX - Low ground pressure) |
| Series | Dash 12 |
| Engine | Komatsu SAA6D114E-3 |
| Engine Power | 160-180 kW (214-241 HP) |
| Operating Weight | 20,000 - 22,000 kg |
| Cylinder Type | Function | Quantity per Dozer | Bore | Rod | Kit Compatibility |
|---|---|---|---|---|---|
| Blade Lift Cylinder (L/R) | Raises/lowers blade | 2 | 95mm | 65mm | ✓ Full compatibility |
| Blade Tilt Cylinder | Tilts blade left/right | 1 | 95mm | 65mm | ✓ Full compatibility |
| Ripper Cylinder | Controls ripper depth | 1 | 95mm | 65mm | ✓ Full compatibility |
✅ ISO 9001:2015 – Quality Management System
✅ ISO 14001 – Environmental Management
✅ RoHS Compliant
✅ REACH Compliant
Q: What Komatsu models use the 707-98-28600 lift cylinder seal kit?
A: The COGENG 707-98-28600 lift cylinder seal kit is a direct OEM replacement designed for select Komatsu equipment where this seal kit part number is specified. Common applications include lift cylinders on Komatsu wheel loaders, dozers, and other heavy equipment with hydraulic lift functions. Always verify this part number against your machine's parts manual or the cylinder's original seal kit reference to confirm exact compatibility before ordering.
Q: What are the symptoms of failing lift cylinder seals?
A: Common symptoms include visible hydraulic oil leaking from the lift cylinder rod or gland area, decreased lifting capacity, cylinder drift where the lift arms or blade slowly lowers under load, jerky or erratic cylinder movement, and external oil residue accumulating around the cylinder. Prompt seal replacement helps prevent internal cylinder scoring and more extensive, costly repairs.
Q: What is included in the COGENG 707-98-28600 seal kit?
A: Each complete seal kit typically includes piston seals, rod seals, wiper seals, O-rings, backup rings, and gland seals required for a full lift cylinder overhaul. COGENG kits are manufactured using high-grade polyurethane, nitrile, and PTFE materials that meet or exceed OEM specifications for abrasion resistance, temperature tolerance, and extended service life.
Q: Is this seal kit suitable for professional hydraulic cylinder rebuilding?
A: Yes, the COGENG 707-98-28600 seal kit is manufactured using high-grade materials to precise OEM dimensional specifications. It is designed for professional cylinder rebuilding and provides reliable sealing performance when installed following standard hydraulic cylinder repair procedures by a qualified technician.
Q: What is the warranty coverage for this seal kit?
A: COGENG provides a standard 12-month warranty against manufacturing defects from the date of installation. Proof of purchase and installation by a qualified technician are required. Warranty does not cover seal failure caused by contaminated hydraulic fluid, improper installation, cylinder barrel or rod surface damage, or use on incompatible equipment.
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