707-99-58090 Bucket Cylinder Seal Kit for Komatsu PC300-7 Excavator
707-99-58090 Bucket Seal Kit Product Overview
707-99-58090 Bucket Cylinder Seal is engineered exclusively for Komatsu PC300-7/PC300LC-7 excavators repair. Restores hydraulic performance with Komatsu-spec PU seals. Eliminates leaks, withstands 34.3MPa pressure
707-99-58090 Seal Kit Specifications
| Komatsu Models | PC300-7, PC300LC-7 (Bucket Cylinder Repair) |
| Cylinder ID | Komatsu K3VG-110/80B |
| Rod/Bore | 80mm (3.15″) / 110mm (4.33″) |
| Operating Pressure | 34.3 MPa (4,975 PSI) dynamic │ Peak tolerance: 40 MPa |
| Temperature Range | -40°C to +110°C (-40°F to 230°F) |
| Hydraulic Fluid | Komatsu BIO HF-2 / KES 07.881 |
| Seal Material | Primary: Cast PU-AU90 (Per ISO 6072) |
PC300-7 Bucket Seal Kit Components
- PU U-Cup Seal – Pressure-actuated design for 20-40MPa digging forces
- PTFE-Nylon Buffer Ring – Prevents U-cup extrusion at rod misalignment >10°
- Triple-Lip Wiper (Purple PU) – Komatsu-specific part, filters >15μm particles
- HNBR O-Rings (SAE J200 Type BG) – Resists HF-2 bio-oil degradation
- Bronze-PTFE Guide Band – Reduces friction coefficient to 0.03
- Anti-Extrusion Washers – Reinforced PTFE for piston-side sealing
The Bucket Seal Kit Performance Advantages
✅ Anti-Leak Guarantee – Withstands 34.3MPa continuous pressure
✅ Extreme Abrasion Resistance – 3.5x longer life vs. generic seals in silica-rich environments
✅ Arctic-Grade Flexibility – -40°C cold crack resistance confirmed at Komatsu Proving Grounds
✅ Komatsu Fluid Compatibility – Zero swelling with BIO HF-2/HF-3 fluids
✅ Anti-Scoring Protection – Guide band reduces cylinder wear to <0.01mm/1,000hrs
Frequently Asked Questions (FAQ)
Q: Do you have any other excavator model repair seal kits ?
A: Yes. As the professional excavator seal kits manufacturer, we produce all the excavators repair seal kits, standard sizes and also support customization. Please tell us the part number seal kit you want.
Q: I can’t find the model I want. Are all your seal repair kits here?
A: No. We have more than tens of thousands seal kits. Here only a small part of them is shown. We have stock of all the seal kits for construction machinery. Please contact us!
Related Products
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PC300-7 Excavator Boom Seal Kit 707-99-58080
- PC300-7 Excavator Arm Seal Kit 707-99-58090
Contact Us
For more information or to request a quote, please contact us or email [email protected].
