Excavator Track Chains: Lubricated vs. Sealed & Greased – Which Is Best for Your Fleet?
September 18, 2026
The undercarriage represents up to 50% of an excavator’s total maintenance budget over its operational lifespan. Among undercarriage components, the track chain (or track link assembly) bears the constant strain of machine weight, severe impact, and abrasive soil conditions.
When replacing or upgrading track link assemblies, fleet managers and equipment owners often face a critical choice: Oil-Lubricated Track Chains (SALT) or Sealed & Greased Track Chains.
Understanding the mechanical differences, internal wear characteristics, and operating environment suitability of each system helps you optimize fleet uptime and lower your cost-per-hour.
Mechanical Comparison: How They Work
Both chain designs aim to prevent internal pin and bushing wear—the primary cause of track stretch and chain pitch extension. However, their internal sealing and lubrication methods differ substantially.
| Feature | Sealed & Greased Track Chains | Oil-Lubricated Track Chains (SALT) |
| Internal Medium | High-viscosity synthetic grease | Synthetic oil (sealed within pin cavity) |
| Sealing System | Standard polyurethane/rubber seals | Heavy-duty dual-cone / metallic face seals |
| Internal Wear | Pin & bushing wear occurs as grease breaks down | Near-zero internal wear while seals remain intact |
| Noise Level | Moderate operational squeak | Exceptionally quiet operation |
| Initial Investment | Lower upfront cost | Higher initial cost |
| Service Life | Standard to medium operational hours | Maximum operating hours in heavy application |
Sealed & Greased Track Chains: Reliable and Cost-Effective
Sealed & Greased Track Chains feature a heavy-duty polyurethane seal pressed between the pin and bushing mating surfaces, packing the internal clearance with high-viscosity grease during factory assembly.
Key Advantages:
- Cost Efficiency: Lower initial purchase price compared to lubricated systems, making them ideal for standard earthmoving projects and budget-conscious fleet operations.
- Debris Barrier: The polyurethane seals and packed grease prevent dirt, sand, and moisture from entering the pin and bushing cavity.
- Proven Performance: Excellent durability for mid-sized excavators working in standard soil, residential construction, and utility trenching.
Best Applications: Medium-duty excavators ($13$–$25$ ton range), seasonal equipment, utility installation, and general earthmoving jobsites. Explore our durable selection of excavator undercarriage parts to find exact-fit assemblies for your machinery.
Lubricated Track Chains (SALT): Maximum Life in Severe Duty
Oil-Lubricated Track Chains—frequently referred to as Sealed and Lubricated Track (SALT) assemblies—feature a hollowed pin reservoir filled with synthetic oil during manufacturing. Specialized metallic face seals lock the oil inside, continuously coating the pin and bushing interface during rotation.
Key Advantages:
- Eliminates Internal Pin Wear: Because metal-on-metal contact inside the bushing takes place in a continuous oil bath, internal friction and pitch stretch are virtually eliminated.
- Extended Track Bushing Life: Bushings last long enough to allow for exterior bushing turns, doubling total chain service life before replacement.
- Reduced Horsepower Loss: Lower internal friction translates to smoother track rotation, reduced strain on final drives, and lower overall fuel consumption.
Best Applications: Heavy excavators ($30$+ ton range), demolition sites, rock quarries, mining operations, and high-hour continuous production fleets.
Decision Matrix: Which Track Chain Fits Your Fleet?
Selecting between lubricated and greased track chains depends on machine size, jobsite severity, and financial lifecycle targets:
- Select Sealed & Greased if you are operating smaller-to-midsize machines, operating under $1,000$ hours annually, or prioritizing lower upfront replacement costs.
- Select Oil-Lubricated (SALT) if your fleet operates heavy excavators in severe rock or high-abrasion environments where minimizing unscheduled downtime is paramount.
Partner with SA Excavator Parts for Undercarriage Solutions
At ShengAn, we manufacture OEM-quality excavator track chains, track rollers, carrier rollers, sprockets, and front idlers compatible with major global excavator brands (CAT, Komatsu, Hitachi, Kobelco, Volvo, and Hyundai).
Our track link assemblies undergo precise induction heat treatment, deep forging, and automated sealing to ensure maximum fatigue resistance under extreme workloads.
Unsure which track chain configuration matches your machine model and jobsite conditions?
Contact Our Undercarriage Specialists for a Fast Quote or send your machine model details today!
