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21T-30-00221
| Availability: | |
|---|---|
| Item | Specification |
|---|---|
| Part Number | 21T-30-00221 |
| Alternative Part Number | 21T3000221 |
| Product Name | Top Roller / Carrier Roller Assembly |
| Product Type | Undercarriage Component |
| Compatible Machine Models | Komatsu PC2000, PC2000-8, PC2000-11 Mining Excavator |
| Roller Type | Top Roller / Carrier Roller (Upper Track) |
| Single Weight | 160 kgs (352.7 lbs) |
| Material | High-strength alloy steel with induction-hardened wear surface |
| Sealing Type | Floating / Duo-cone seals for contamination protection |
| Application | Supports and guides the track chain in the upper section of the undercarriage |
| Industry Focus | Surface Mining, Heavy Excavation, Overburden Removal |
Komatsu 21T-30-00221 top roller
PC2000 carrier roller assembly
21T3000221 top roller for PC2000
Komatsu PC2000 undercarriage parts
160 kg carrier roller for PC2000
Replacement top roller for PC2000 excavator
Komatsu mining excavator carrier roller
The Komatsu 21T-30-00221 Top Roller Assembly (Carrier Roller) is a genuine OEM-specification undercarriage component designed for the Komatsu PC2000 series mining excavators (PC2000, PC2000-8, PC2000-11). This top roller (carrier roller) supports the upper strand of the track chain, reducing track sag and ensuring proper alignment between the drive sprocket and idler.
The PC2000 series are ultra-class mining excavators used in large-scale surface mining, heavy excavation, and overburden removal. This carrier roller is manufactured from high-strength alloy steel with induction-hardened tread surfaces for maximum wear resistance in abrasive mining conditions.
| Feature | Benefit |
|---|---|
| Top Roller / Carrier Design | Supports upper track chain, reducing sag and vibration |
| Induction-Hardened Tread Surface | Exceptional wear resistance in extreme mining conditions |
| Floating / Duo-Cone Seals | Advanced sealing prevents contamination and retains lubrication |
| Precision Bearings | Smooth rotation with minimal friction for extended service life |
| Heavy-Duty Construction (160 kg) | Robust build for ultra-class mining applications |
| PC2000 Series Optimized | Specifically engineered for Komatsu PC2000, PC2000-8, PC2000-11 |
| Factory Lubricated | Maintenance-free sealed design |
| Direct OEM Replacement | Guaranteed fit and performance |
| Specification | Detail |
|---|---|
| Machine Models | Komatsu PC2000, PC2000-8, PC2000-11 |
| Machine Type | Ultra-Class Mining Excavator |
| Operating Weight | ~200,000 - 210,000 kg |
| Bucket Capacity | ~12.0 - 15.0 m³ |
| Engine Power | ~800-900 HP |
| Position | Top / Upper track (Carrier Roller) |
| Component | Part Number | Description |
|---|---|---|
| Track Assembly | 21T-32-01017 | Complete track assembly (9,350 kg) |
| Idler | 21T-30-00481 | Front idler (1,350 kg) |
| Bottom Roller | Various | Lower track roller |
| Sprocket | Various | Drive sprocket |
Position: This is a top/carrier roller - supports the upper track strand
Lifting Note: At 160 kg, proper lifting techniques and mechanical assistance are recommended
Bolt Torque: Follow Komatsu OEM specifications for mounting bolt torque
Regular Inspection: Check for seal damage, bearing wear, and tread wear periodically
Lubrication: Factory-sealed; no field lubrication required
Replacement: Replace when tread wear exceeds OEM specifications or when seal failure occurs
| Condition | Action |
|---|---|
| New tread - smooth rotation | Normal operation |
| Moderate tread wear | Monitor regularly |
| Excessive tread wear (flat spots) | Replace roller |
| Seal leakage | Replace roller immediately |
| Bearing noise/play | Replace roller |
| Item | Detail |
|---|---|
| Part Number | 21T-30-00221 / 21T3000221 |
| Type | Top Roller / Carrier Roller Assembly |
| Weight | 160 kg per piece |
| Compatibility | Komatsu PC2000, PC2000-8, PC2000-11 |
| Packaging | Individual crate |
Note: This is a top/carrier roller for the Komatsu PC2000 series mining excavators (PC2000, PC2000-8, PC2000-11). Verify machine serial number and undercarriage configuration before ordering. Due to weight (160 kg), proper lifting techniques and mechanical assistance are recommended during installation. Regular inspection of carrier rollers is essential for optimal undercarriage performance on this ultra-class mining excavator.
