Mini Excavator Bottom Track Roller 6800510 6815115 6814878 6533654 for Bobcat X322 X323

Mini excavator track bottom rollers (also called bottom rollers or carrier rollers) play a critical role in supporting the machine’s weight and ensuring smooth, stable track movement.

In just a few sentences:

The primary functions of mini excavator track bottom rollers are:

1. To bear and distribute the full weight of the excavator onto the track chain, preventing excessive sagging or track derailment.

2. To guide the track chain smoothly around the undercarriage, reducing side-to-side movement and vibration.

3. To maintain proper track tension and alignment during operation on uneven or soft ground.

How a mini excavator track bottom roller works:

Each track roller has a forged steel body with a hardened tread surface and rotates freely on sealed bearings (usually with floating seals and grease lubrication). As the machine moves, the track chain rolls over the roller’s outer diameter. The roller’s weight-bearing design and low-friction rotation allow it to support heavy loads while minimizing wear on both the roller itself and the track links/pins. The sealed lubrication system keeps dirt and water out, ensuring long-lasting smooth spinning even in muddy, dusty, or abrasive conditions.

Standard manufacturing practices for track rollers (bottom rollers in excavators):

• Raw Materials → Forging → Machining → Heat Treatment → Grinding/Surface Treatment → Assembly → Quality Control → Packaging

Production Description:

Compitable Models: Bobcat X320, 220, 319, 320, 320 D, 320 J, 322, 322 D, 322 G, 323

Part Number: 6800510, 6815115, 6814878, 6533654

MOQ: 2 PCS

Payment Method: T/T

Condition: New

Color: Yellow, Black or Customized

Lead Time: 15- 30 days

Warranty: 1 Year

Place of Origin: Quanzhou, China

Packing: Standard Export Wooden Pallet

When you order custom track rollers from us, we don’t just manufacture to specs — we actively partner with you to review every detail of the drawings together. This step delivers real, tangible value to you as the customer:

• You get rollers that truly fit your machine the first time
• You avoid expensive field failures and unexpected repair costs
• You receive exactly what you need — no compromises
• You save significant time and money in the long run
• You gain peace of mind and stronger confidence in your supplier

KASU Factory Advantages:

• Direct Source Manufacturer with Years of Specialized Experience
• We are a dedicated factory with over20 years focused exclusively on mini excavator undercarriage parts — no trading company middlemen, ensuring consistent quality control from raw material to finished product.
• Strict Raw Material Selection & Traceability
• We only use high-grade forged alloy steels (50Mn, 40Mn2, 40Cr, etc.) from certified mills, with full chemical composition analysis and mechanical property testing for every batch — guaranteeing superior strength, toughness, and wear resistance.
• Precision Manufacturing & Advanced Processing
• State-of-the-art forging presses, CNC machining centers, medium-frequency induction quenching, and automated grinding lines deliver tight tolerances, uniform hardness (HRC 52–58 on tread), and excellent surface finish — every detail optimized for durability in harsh working conditions.
• Rigorous Multi-Stage Quality Inspection
• 100% inspection at key stages: ultrasonic/magnetic particle flaw detection after forging, dimensional & hardness checks after heat treatment, seal leakage & dynamic balance testing after assembly — we maintain defect rates far below industry averages.
• Comprehensive One-Stop Undercarriage Parts Supply
• Full range available: bottom rollers, top rollers (carrier rollers), front idlers, track chains, track shoes/pads, sprockets, and more — all compatible with popular mini excavator brands (Bobcat, Kubota, Yanmar, Takeuchi, John Deere, etc.), allowing customers to source everything from one reliable supplier.
• Competitive Factory-Direct Pricing
• By eliminating distributors and trading layers, we offer premium aftermarket quality at 30–50% lower prices than OEM parts and significantly better value than low-end imports.
• Fast Lead Time & Reliable Global Delivery
• In-house production capacity + efficient logistics enable short lead times (often 15–30 days for standard orders) and secure worldwide shipping with proper anti-rust & export packaging.

• Strong OEM/ODM Capability & Customization Support We welcome custom drawings, special heat treatment requirements, custom markings, and private labeling — ideal for distributors, dealers, and large fleet operators looking for branded or tailored solutions.

Frequently Asked Questions

Q: How do I know if my bottom rollers need replacement?

A: Look for flat spots, excessive play, leaks, or noise during operation. Measure flange wear—if under 10mm depth, replace immediately.

Q: What's the difference between bottom and top rollers?

A: Bottom rollers support weight on the ground; top (carrier) rollers guide the upper track. This is a bottom roller (lower track roller).

Q: Can I get bulk discounts for my fleet?

A: Absolutely—email us with quantity for custom quotes on mini excavator bottom rollers.