The track roller (also called the bottom roller or carrier roller) is a critical undercarriage component on bulldozers, excavators, and crawler cranes. It supports the machine’s full weight, guides the track chain, and operates in constant contact with abrasive soil, rocks, and debris. A single failed roller can immobilize an entire machine, costing thousands of dollars per hour in downtime.
Ningbo Ruican manufactures track roller bodies using investment casting in high-strength ductile iron and alloy steel, followed by precision CNC machining of the bore, outer diameter, and flange profiles. The roller body is designed for through-hardening or induction hardening of the outer raceway to achieve HRC 50–58 surface hardness with a tough, ductile core.
What sets Ningbo Ruican apart in undercarriage component manufacturing:
Wear-Resistant Metallurgy: We select and control alloy chemistry to optimize abrasion resistance and impact toughness—extending roller service life in the toughest job site conditions.
Induction Hardening Capability: Outer raceway surface hardness up to HRC 55–58, hardening depth 3–8 mm, while maintaining a tough core (HRC 28–35) for impact resistance.
Precision Bore Machining: Internal bore held to H7 tolerance with surface finish Ra 0.8 µm—ensuring proper fit with bushings and seals for oil-lubricated roller designs.
100% Crack Detection: Every roller body undergoes magnetic particle inspection (MPI) to detect surface- and subsurface-cracks before machining.
Integrated Supply Chain: Casting, heat treatment, and machining—all in one facility. One PO, one quality system, one delivery date.
Undercarriage Expertise: Our engineering team has experience with undercarriage components for machines ranging from 5-ton mini excavators to 50-ton bulldozers. We can reverse-engineer from samples or manufacture OEM drawings.
Specifications
Parameter Specification
Process: Silica-sol investment casting, CNC turning + induction hardening
Material QT600-3, QT700-2, 40Cr, 42CrMo, 50Mn2
Outer Diameter Range Ø100 – Ø300 mm
Roller Length 100 – 500 mm
Bore Tolerance H7 (±0.015 mm)
Outer Diameter Tolerance ±0.02 mm
Surface Hardness (Raceway) HRC 50–58 (induction hardened)
Core Hardness HRC 28–35
Hardening Depth 3–8 mm
NDE/NDT 100% Magnetic Particle Inspection (MPI)
Surface Finish Ra 0.8 µm (bore & raceway), Ra 3.2 µm (flange)
Certification IATF 16949, ISO 9001
MOQ 200 pcs per size
Lead Time 4–6 weeks for production; 2–3 weeks for samples
Applications
Bulldozers (D3–D11 class), crawler excavators (5–50 ton), crawler cranes, pile drivers, asphalt pavers, drilling rigs, and military tracked vehicles. Suitable for both sealed (oil-lubricated) and unsealed roller designs.
Call to Action
Don’t let undercarriage failures stop your machines. Ningbo Ruican delivers induction-hardened track roller bodies with 100% crack detection and IATF 16949 quality assurance. Contact us send your drawings or samples for a free evaluation and quotation.
Reviews
There are no reviews yet.