 |
loading
550-0278
| Availability: | |
|---|---|
| Item | Specification |
|---|---|
| Part Number | 550-0278 (or 5500278) |
| Product Name | Single Flange Track Roller / Bottom Roller |
| Product Type | Undercarriage Component |
| Compatible Machine Models | Caterpillar D7, D7E, D7R, D7R LGP, D7R XR, D7T Dozers |
| Roller Type | Single Flange (Bottom/Lower Track Roller) |
| Single Weight | 69 kgs (152.1 lbs) |
| Material | High-strength alloy steel with induction-hardened wear surface |
| Sealing Type | Floating / Duo-cone seals for contamination protection |
| Application | Supports machine weight and guides the track chain |
| Industry Focus | Construction, Land Clearing, Heavy Dozing, Mining Support |
Caterpillar 550-0278 track roller
D7R single flange roller
5500278 bottom roller
CAT D7R undercarriage parts
69 kg track roller for D7 dozer
Replacement bottom roller for D7R
Caterpillar dozer track roller
The Caterpillar 550-0278 Single Flange Track Roller is a genuine OEM-specification undercarriage component designed for Caterpillar D7 series dozers including D7, D7E, D7R, D7R LGP, D7R XR, and D7T. This single flange track roller (bottom roller) is a critical load-bearing component that supports the machine's weight and guides the track chain during operation.
The D7 series are large dozers used in construction, land clearing, heavy dozing, and mining support applications. The single flange design provides effective track guidance while balancing weight and durability. Manufactured from high-strength alloy steel with induction-hardened tread surfaces, it delivers maximum wear resistance in abrasive conditions.
| Feature | Benefit |
|---|---|
| Single Flange Design | Effective track guidance with balanced weight distribution |
| Induction-Hardened Tread Surface | Exceptional wear resistance in abrasive 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 (69 kg) | Robust build for larger dozer applications |
| D7 Series Optimized | Specifically engineered for CAT D7 series dozers |
| Factory Lubricated | Maintenance-free sealed design |
| Direct OEM Replacement | Guaranteed fit and performance |
| Machine Model | Type | Application |
|---|---|---|
| D7, D7E | Dozer | Construction, dozing, land clearing |
| D7R, D7R LGP, D7R XR | Dozer | Construction, dozing, land clearing |
| D7T | Dozer | Construction, dozing, land clearing |
| Component | Part Number | Description |
|---|---|---|
| Track Assembly | 422-1129 | Complete track assembly (1,960 kg) |
| Sprocket Segment | 314-5462 | Sprocket segment (13.5 kg) |
| Top Roller | — | Carrier roller assembly |
| Idler | — | Front idler assembly |
Position: This is a bottom/lower track roller - supports machine weight
Lifting Note: At 69 kg, proper lifting techniques and mechanical assistance are recommended
Bolt Torque: Follow Caterpillar 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 | 550-0278 / 5500278 |
| Type | Single Flange Track Roller (Bottom Roller) |
| Weight | 69 kg per piece |
| Compatibility | CAT D7, D7E, D7R, D7R LGP, D7R XR, D7T Dozers |
| Packaging | Individual crate |
Note: This is a single flange bottom track roller for Caterpillar D7 series dozers. Verify machine serial number and undercarriage configuration before ordering. Due to weight (69 kg), proper lifting techniques and mechanical assistance are recommended during installation.
