DX225LC-7 Doosan Excavator Track Carrier Roller Assembly Forged 50Mn Steel Induction Hardened Undercarriage Part

The YT track carrier roller assembly in this listing is engineered for the Doosan DX225LC-7 hydraulic excavator and is cross-referenced in our catalog for the Doosan DX300LC-5. Sitting on the upper track frame, this roller, commonly called the top roller, carries the return run of the track chain between the front idler and the drive sprocket. A correctly matched carrier roller limits chain sag, keeps the track taut, and reduces the shock transmitted to the links, pins and bushings whenever the machine travels or swings under load.

• Closed-die forged shell: The roller body is forged from 50Mn round bar so the grain flow follows the contour of the part, giving toughness that cast rollers cannot match in heavy impact service.
• Induction hardened race: Medium-frequency induction hardening delivers 50-55 HRC across the running surface with a case depth of 3-5 mm, extending resistance to chain abrasion.
• CNC finished bore: The shaft bore is machined and honed to a consistent tolerance so the roller rotates smoothly on the mounting shaft through the full service interval.
• Duo-cone metal face seals: Twin metal sealing rings keep the grease charge inside and stop dust, sand and water from reaching the bearing zone.
• Correct flange geometry: Flange width and lip profile are controlled to guide the chain side face and limit lateral wear on the link counterbores.
• Export-grade protection: Every roller receives rust-inhibiting oil and a protective primer so it arrives clean and corrosion free after long sea freight.

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.

The table below lists the main dimensions of the YT carrier roller for the Doosan DX225LC-7 and the Doosan DX300LC-5. All figures are reference values supplied for selection purposes.

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

1. Bars are cut to billet length and heated in an induction furnace to the forging temperature range.
2. Closed-die forging shapes the roller body with the required flange and race profile.
3. Normalizing and quenching-tempering refine the grain structure and establish a tough core.
4. CNC turning machines the race, bore, flange faces and seal grooves to drawing tolerances.
5. Medium-frequency induction hardening brings the race to 50-55 HRC at a controlled depth.
6. Grinding and polishing finish the sealing surfaces and race to the final roughness.
7. The roller is assembled with duo-cone metal face seals and the correct grease charge.
8. Hardness testing, magnetic particle inspection and dimensional sampling cover every batch.
9. Rust-proofing oil is applied and the roller is packed for export shipment.

XIAMEN YINTAI MACHINERY CO., LTD. (brand YT) has manufactured undercarriage components since 2011 and today employs 50-100 people with annual sales of USD 10-20 million, of which 90-100 percent is exported. The plant houses closed-die forging, CNC machining, heat treatment and induction hardening lines, so a carrier roller moves through every process step under one roof instead of traveling between subcontractors.

Quality is managed under an ISO 9001:2015 system with incoming material inspection, in-process gauging and final dimensional records for every batch. Buyers are welcome to arrange SGS or third-party inspection before dispatch, and OEM/ODM programs are available for customers who need their own part numbers, packaging or delivery schedules.

• High-wear earthmoving sites: For contractors working in decomposed granite and rocky fill, the hardened race and metal seals keep this top roller in service far longer than soft-faced alternatives.
• OEM replacement cost control: The YT forged roller delivers OEM-style material and hardness at an aftermarket price, helping fleet owners cut maintenance spend without accepting weaker parts.
• Old machine refurbishment: When a DX225LC-7 is rebuilt, replacing the carrier rollers together with the chain group avoids premature wear caused by mismatched running surfaces.
• Bulk supply for dealers: Distributors serving Doosan fleets can stock one part number that covers DX225LC-7 and DX300LC-5 cross-fit demand, simplifying their inventory.

Track carrier rollers from this listing suit Doosan DX225LC-7 and DX300LC-5 excavators working in road construction, site leveling, pipe laying, quarry loading and general earthmoving. The roller is equally at home on machines fitted with genuine undercarriage and on rebuild machines that have been re-tracked with aftermarket chain groups, provided the frame dimensions match. Contractors who run their excavators on hard surfaces such as asphalt and concrete benefit most, because firm ground transmits the highest shock into the upper track run.

Q1: How do I confirm this carrier roller fits my Doosan DX225LC-7?

Compare the roller diameter, width and shaft bore with the removed part, or send YT the machine serial number and we will check the build configuration before you order.

Q2: Is this an OEM part or an aftermarket part?

It is a YT aftermarket part manufactured to match original specifications in material, hardness and dimensions. It is not branded as an OEM item but is designed as a direct replacement.

Q3: What hardness can I expect on the running surface?

The race is induction hardened to 50-55 HRC with a 3-5 mm case depth, which balances wear resistance against the toughness needed for impact loads.

Q4: What is the minimum order quantity and can I get a sample?

The minimum order is one piece, so a single sample roller can be shipped for evaluation before you commit to a larger order.

Q5: How is the roller packed and what warranty applies?

Rollers are rust-protected and packed on steel pallets, with export wooden cases available on request. A 12-18 month warranty covers material and workmanship defects.

Each carrier roller is degreased, coated with anti-rust oil and wrapped in waterproof film before being placed on a steel pallet or an export wooden pallet with plywood protection. Full container orders can be mixed with other YT undercarriage parts to save freight. Quality assurance covers chemical certification of the raw material, hardness reports, dimensional inspection records and seal performance checks, and SGS inspection is supported before shipment.

• 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.