Carrier rollers support the upper track chain, maintaining tension and alignment across the excavator or bulldozer undercarriage system.
We operate factory-direct, supplying comprehensive OEM manufacturing services for global Komatsu equipment owners and construction fleets.
Our rollers resist abrasive wear and prevent catastrophic track sag, eliminating unplanned downtime and costly secondary component damage.
Backed by 20+ years of undercarriage specialization and ISO9001/SGS certification, our quality meets the most demanding mine and quarry specifications.
Forged from 35MnB steel with deep-harden quenching, every carrier roller delivers high impact toughness and extended service intervals.
- Premium 35MnB Material – Roller bodies are forged from high-tensile 35MnB steel, providing exceptional resistance to bending and fatigue cracking under heavy loads.
- Deep Quenching/Heat Treatment – Precision-controlled induction hardening creates a deep wear-resistant tread layer (HRC 50-58) without compromising core ductility.
- Precision Forging – Near-net-shape forging and CNC finish machining guarantee dimensional accuracy, perfect fit, and reduced internal stress concentrations.
- 100% QC Inspection – Every roller undergoes dimensional checks, ultrasonic flaw detection, and rotational torque testing before shipment to ensure zero field defects.
Our catalog of Komatsu Carrier Rollers includes various specifications, fully compatible with Komatsu excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB steel body, high-grade shaft steel |
| Hardness (Tread) | HRC 50–58 |
| Manufacturing Process | Forging, CNC machining, deep quenching, assembly |
| Certification | ISO9001:2015, SGS material & dimension reports |
| Warranty | 12 months or 2,000 operating hours under normal use |
2. OEM & Customization
We manufacture to exact customer drawings or sample parts, replicating dimensions, seal interfaces, and bracket geometry to true Komatsu OEM standards.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Excavator | Komatsu | PC200-6/7/8, PC220, PC300, PC400, PC450 |
| Bulldozer | Komatsu | D65, D85, D155, D275, D375 |
4. Delivery & Logistics
Factory-direct pricing with secure ocean freight packaging. Flexible MOQ accepts trial orders; typical container loading ensures cost-efficient bulk delivery.
Technical Features
The carrier roller integrates a double-cone floating seal that keeps lubricant in and contaminants out, enabling maintenance-free bearing operation across muddy or dusty sites.
Deep-hardened tread and flange surfaces reduce wear from continuous track link contact. The high-carbon outer layer withstands sliding abrasion far longer than standard rollers.
A reinforced support axle and thrust ring absorb lateral loads during turning, preventing shaft bending and maintaining undercarriage alignment throughout the service life.
Applications
- Open-pit mining
- Heavy civil construction
- Quarrying and aggregate processing
- Demolition and scrap handling
- Road building and infrastructure
- Forestry and land clearing
Frequently Asked Questions
What is the MOQ for Komatsu carrier rollers?
You can start with as few as 4 pieces. We support both trial orders and full container purchases.
What is the typical delivery time?
Standard production completes in 25–30 days, with partial stock availability for faster dispatch by sea or air.
How deep is the heat treatment?
Tread hardening depth ranges from 4 mm to 8 mm depending on part number, ensuring wear resistance without brittleness.
What warranty do you provide?
12 months or 2,000 hours, covering material and manufacturing defects under normal operating conditions.
Can you match my existing part number?
Yes. We cross-reference Komatsu OEM part numbers and confirm all dimensions before manufacturing.
Maintenance Guide
Inspect for oil leakage or side clearance monthly. Replace any roller showing seal failure immediately.
Measure tread wear with a profile gauge; replace when wear exceeds 25% of original tread height.
Torque mounting bolts to specification every 500 hours to prevent bracket loosening and axle tilt.
Replace rollers in matched sets across the same track frame to maintain even load distribution.