6803281 Cylinder Seal Kit for Bobcat Excavator 320D 320G 322D 322G X320 Blade/Boom Repair
6803281 Cylinder Seal Kit Targeted Compatibility
6803281 Cylinder Seal Kit Precision-engineered for both blade tilt and boom lift cylinders in critical D/G-series excavators:
- Core Models: 320D, 320G, 322D, 322G, X320
- Cylinder Markings: Requires “BT-5G” (blade) or “BM-7D” (boom) castings
- Exclusions: 325D (use kit 6811005) │ Earlier 320C (pre-2016) cylinders
6803281 Seal Kit Technical Specifications
| Parameter | Blade Cylinder | Boom Cylinder |
|---|---|---|
| Bore/Rod Size | Ø80mm / Ø45mm | Ø110mm / Ø60mm |
| Max Pressure | 45 MPa (6,526 PSI) | 42 MPa (6,091 PSI) |
| Temp. Range | -30°C to +125°C | -30°C to +120°C |
| Primary Seal Material | Polyurethane U-Cup (95A) | HNBR Quad-Ring (90 IRHD) |
| Wear Band | RPTFE Bronze-Filled (0.06mm) | Glass-Reinforced PTFE |
| Side Load Protection | 45° Tapered Anti-Extrusion Ring | PEEK Washer Stack |
Seal Kit Contents
| Ultra-High Pressure U-Seal | 45MPa rating (blade impact resistance) |
| Double-Acting Buffer System | Shock absorption for hammer/vibratory blade use |
| Zero-Clearance Wear Band | 0.06mm tolerance (prevents rod scoring) |
| Low-Friction Rod Seal | 3-lip HNBR w/ micro-spring (retains grease film) |
| Anti-Vortex Wiper | 80° flare design sheds mud/debris |
| Hydrodynamic Guide Ring | PTFE grooves maintain 0.02mm oil film |
| Installation Capsule | Bobcat-recommended assembly grease (P/N 6720441) |
Performance Validation
✅ Blade Vibration Resistance: 0 leakage after 50,000+ vibratory blade cycles (Bobcat Test Protocol TP-HYD-22B)
✅ Arctic Reliability: -30°C cold start performance (MIL-S-45180 compliant)
✅ Contamination Defense: Wiper blocks 99% of >15μm particles (per ISO 21009)
✅ Extended Service Life: 25% longer lifespan than generic kits (field data from 322G logging operations)
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!
Contact Us
For more information or to request a quote, please contact us or email [email protected].
