Dingtai manufactures Doosan carrier rollers, the top support components that maintain track stability and alignment in crawler excavator undercarriage systems.
We provide factory-direct OEM and aftermarket production, matching Doosan drawings and part numbers for global dealers, importers, and maintenance teams.
Hardened 35MnB steel and precision machining reduce premature wear, overheating, and flange cracking, preventing costly track derailment and site downtime.
With over 20 years of manufacturing experience and ISO9001/SGS-certified processes, Dingtai delivers consistent quality traceability for heavy machinery buyers.
Our carrier rollers use deep quenching, fine-grain 35MnB forgings, and CNC-machined bearing seats to ensure structural integrity under heavy loads.
Core Selling Points
- Premium 35MnB Material: Roller shells and shafts are forged from high-tensile 35MnB steel for superior fatigue resistance and longer service life under impact.
- Deep Quenching/Heat Treatment: Tread and flange surfaces receive deep induction hardening to HRC 50-56, providing excellent wear resistance in abrasive conditions.
- ISO9001/SGS Certified: Every production batch follows ISO9001 quality systems and SGS-tested material standards, ensuring reliable, traceable components.
- OEM Capabilities: We manufacture to original Doosan dimensions, part numbers, and drawings, supporting exact fitment for aftermarket replacement requirements.
Product Grid
Our catalog of Doosan Carrier Rollers includes various specifications, fully compatible with Doosan excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB forged steel shell and shaft |
| Hardness | HRC 50-56 on tread and flange surfaces |
| Process | Precision forging, CNC machining, deep induction hardening |
| Sealing | Double-floating seal, lifetime lubrication |
| Certification | ISO9001/SGS |
| Warranty | 12 months or 2,000 operating hours |
2. OEM & Customization
Dingtai matches OEM drawings, part numbers, and custom dimensions. We control machining tolerances to ensure direct replacement without modification.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Crawler Excavators | Doosan | DX140LC, DX225LC, DX300LC, DX340LC, DX420LC, DX480LC |
| Tracked Dozers | Doosan | DD80, DD100 |
4. Delivery & Logistics
Dingtai ships factory-direct worldwide with flexible MOQ from small trial orders to bulk container loads. We provide reliable export packaging and on-time delivery.
Technical Features
Each carrier roller assembly uses a double-floating seal system that locks lubricant inside and blocks abrasive particles, extending bearing life.
Bimetal or bronze alloy bushings provide smooth rotation and reduce friction heat, preventing shaft seizure under continuous heavy operation.
Deep induction hardening on the tread reaches 50-56 HRC, creating a wear-resistant surface while the core remains tough.
Applications
- Mining: Continuous heavy loads and abrasive rock conditions.
- Road Construction: Stable tracking on graded surfaces and asphalt works.
- Quarrying: Impact resistance against crushed stone and high debris.
- Demolition: Reliable support in steel and concrete debris environments.
- Infrastructure: Long service life for utilities, pipelines, and general earthmoving.
Frequently Asked Questions
Q: What is the minimum order quantity (MOQ) for Doosan carrier rollers?
A: Typical MOQ starts from 1 piece for trial orders, with tiered pricing available for bulk quantities.
Q: How long is delivery after order confirmation?
A: Standard production requires 15-30 days depending on order quantity; we confirm exact lead time after drawings and specifications are verified.
Q: What heat treatment depth do you apply to carrier rollers?
A: Tread hardening depth ranges 5-10 mm with HRC 50-56 on the surface, ensuring wear resistance without sacrificing core toughness.
Q: Do you offer warranty for carrier rollers?
A: Yes, standard warranty covers 12 months or 2,000 operating hours under normal use, covering material and manufacturing defects.
Q: Can you match original Doosan part numbers?
A: Yes, we cross-reference OEM part numbers and drawings to supply exact-fit replacements for direct installation.
Q: Do you provide samples before bulk orders?
A: Sample orders are accepted for evaluation; custom dimensions and OEM markings can be included after drawing confirmation.
Q: How do you ensure 100% QC inspection?
A: Each roller passes dimensional checks, hardness testing, and seal pressure tests before shipping.
Maintenance Guide
Installation: Confirm part number and alignment before mounting; torque bolts evenly and verify roller rotates freely by hand.
Inspection: Check for oil leaks, flange cracks, and abnormal play every 250 operating hours; replace worn rollers promptly.
Track tension: Maintain correct track sag to avoid excessive side loads on carrier rollers and other undercarriage components.
Lubrication: Do not open sealed assemblies; sealed-for-life lubrication requires no additional greasing unless external damage occurs.
Replacement: Replace carrier rollers in matched pairs or complete sets to maintain even track alignment and prevent accelerated wear.