330D Caterpillar Excavator Track Carrier Roller Assembly Forged 50Mn Steel Induction Hardened Undercarriage Part

The YT track carrier roller assembly is a heavy-duty replacement component for the Caterpillar 330D hydraulic excavator undercarriage. Fitted to the upper track frame, the roller, known in the field as the top roller, supports the return run of the track chain as it moves back from the idler to the drive sprocket. On a 33 t class machine the chain is heavy, and a worn or seized carrier roller lets it drop and slap, which quickly damages links and bushings; this forged YT roller is built to carry that load reliably.

• Forged 50Mn shell: The one-piece forged body carries the high loads of a 330D class machine without the weld weaknesses found on fabricated rollers.
• Induction hardened race: A 50-55 HRC surface with 3-5 mm case depth resists the grinding contact of a heavy chain running under tension.
• Engineered shaft fit: The bore is machined to a controlled tolerance band so the roller turns freely on the shaft with minimal clearance wear.
• Heavy-duty sealing: Duo-cone metal face seals protect the grease cavity against the mud, water and rock dust typical of heavy construction sites.
• Consistent flange control: Flange dimensions are held around the full circle, keeping the chain aligned and preventing uneven link wear.
• Corrosion protection: Anti-rust oil treatment and protective wrapping keep the roller ready for installation after long-distance shipping.

The models above are just for reference, we can't list all models here. We can supply more products as your requirements. Please feel free to send us your inquiry.

This reference data sheet covers the YT carrier roller intended for the Caterpillar 330D. The figures represent typical catalog values for pre-order matching and are not a substitute for measuring the removed part.

*Values are reference; OEM part number confirmation advised before ordering.

1. 50Mn steel bars undergo spectrometric testing at intake to confirm alloy composition.
2. Cut billets are heated in an induction furnace to the precise forging temperature.
3. Closed-die forging forms the shell, including flanges and race allowance, in one heat.
4. Normalizing plus quenching and tempering delivers a strong, impact-resistant core.
5. CNC machines turn the race, bore and flange faces to the required tolerances.
6. Induction hardening of the race achieves the specified 50-55 HRC surface hardness.
7. Precision grinding finishes the bore and race and corrects any heat treatment movement.
8. Duo-cone seals and the measured grease charge are fitted during assembly.
9. Inspection verifies hardness, checks for surface defects and records critical dimensions.
10. Rust preventive is applied and the part is packed into export-grade packaging.

YT is the export brand of XIAMEN YINTAI MACHINERY CO., LTD., established in 2011 as a manufacturer and exporter focused on undercarriage components. The company employs 50-100 people and achieves USD 10-20 million in annual sales, with 90-100 percent going to overseas customers. Its integrated plant performs forging, CNC machining, heat treatment and induction hardening in-house, which keeps quality consistent and shortens production lead times.

Certified to ISO 9001:2015, the factory documents every step from steel receiving to final inspection, and third-party inspection by SGS is routinely supported. YT also accepts OEM and ODM requests, making it a practical supply partner for equipment dealers, rental companies and national distributors that need dependable Caterpillar undercarriage alternatives.

• Mass excavation projects: On highway cuts and dam sites where 330D machines work long shifts, the hardened YT roller reduces the risk of mid-shift undercarriage failures.
• Cost program for large fleets: Fleet managers replacing multiple rollers can negotiate tiered pricing and scheduled deliveries that align with their maintenance calendar.
• Emergency breakdown service: When a carrier roller fails on site, YT can dispatch a replacement by air freight so the excavator returns to work without waiting for a sea shipment.
• Complete undercarriage kits: For full rebuilds, YT bundles carrier rollers with track rollers, idlers, sprockets and chain to ensure matched wear life across the entire track group.

The Caterpillar 330D is a production-class excavator found on large earthmoving jobs, quarry faces, pipeline spreads and heavy infrastructure contracts, and this carrier roller supports those duties by keeping the upper chain run stable. The part is also relevant for machines used in demolition and scrap processing, where frequent travel over uneven, abrasive ground puts continuous demand on the top rollers. Whatever the application, regular greasing and inspection of the carrier rollers remain essential to reaching the full service life of the component.

Q1: Is this carrier roller a genuine Caterpillar part?

No, this is a YT aftermarket replacement manufactured to match the original roller specification. It is built from forged 50Mn steel with an induction hardened race for equivalent wear performance.

Q2: How do I verify the correct size for my 330D?

Measure the diameter, width and shaft bore of the existing roller, or send the machine serial number to YT. Our team will confirm the matching reference before shipment.

Q3: Why choose a forged roller over a cast one?

Forging produces a denser, directionally aligned grain structure that copes better with the repeated impact loads a 33 t excavator transmits into its track frame.

Q4: What is the warranty and after-sales support?

YT offers a 12-18 month warranty against material and workmanship defects, and the sales team stays available for technical questions on fitting and maintenance.

Q5: How are orders shipped internationally?

Orders leave by sea freight on steel or wooden pallets, or by air for urgent needs. Payment terms are T/T or L/C, and the MOQ is one piece for evaluation orders.

Rollers are coated with rust-preventive oil, wrapped in vapor-proof film and packed on steel pallets or into export wooden crates depending on quantity and destination. Every shipment includes material certificates, hardness reports and inspection records, and SGS or other third-party inspection can be arranged prior to loading. This disciplined packaging and documentation routine has made YT a trusted source for undercarriage parts across more than a decade of export business.

• Through quench-tempering processes to ensure excellent mechanical properties, high strength and superior wear resistance to bending and breakage.
• Advanced Germany KUKA automatic machining center, horizontal and vertical CNC machining ensure the accuracy of assembly dimensions. This is to maximize the life span of each component and minimize production cost.
• MAKZAK Precison Finishing Machinery from Japan makes sure we have steady and good welding quality.
• We have complete production line and professional designers and working team. We can also produce any requested parts according to your blue print or samples.