DH220 Daewoo Excavator Track Carrier Roller Assembly Forged 50Mn Steel Induction Hardened Undercarriage Part

This YT track carrier roller assembly is a direct replacement part for the Daewoo DH220 hydraulic excavator undercarriage and is also listed as a cross fitment for the Daewoo DH300-5. The roller, frequently called the top roller in the trade, runs along the upper track frame and carries the weight of the return chain as it travels back from the front idler toward the drive sprocket. Keeping that chain run properly supported prevents sagging, lowers vibration during travel, and shields the pins and bushings from unnecessary hammering on rough ground.

• Forged 50Mn steel shell: Each roller body starts as a solid 50Mn billet and is shaped in a closed die, so the finished part keeps the fatigue resistance that impact service demands.
• Hardened running surface: The outside race is induction hardened to 50-55 HRC over a 3-5 mm case, resisting the abrasive sliding contact of the chain day after day.
• Precision ground bore: The bore is ground after hardening to hold concentricity, allowing free rotation on the shaft without binding or rocking.
• Sealed grease cavity: Duo-cone metal face seals hold the lubricant charge in place and keep mud and grit away from the rotating interface.
• Uniform flange profile: The flange is machined to a consistent height around the full circumference so the chain is guided without point loading.
• Protective coating: A rust-inhibiting finish shields the roller during warehousing, container loading and ocean transit.

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 specification sheet below reflects the YT reference build for the Daewoo DH220 and the Daewoo DH300-5. Dimensional values are given for preliminary matching and should be checked against the worn part being replaced.

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

1. Incoming 50Mn bars pass spectrometric analysis to verify alloy content against the material certificate.
2. Billets are cut to weight and heated evenly in an induction furnace ahead of forming.
3. A closed-die forging press shapes the roller geometry in one controlled operation.
4. Normalizing followed by quenching and tempering sets a tough, uniform core structure.
5. CNC lathes machine the race, flange and bore to the dimensions shown on the drawing.
6. Induction hardening equipment raises the race hardness to 50-55 HRC at the specified depth.
7. Finishing grinding cleans up the seal faces and brings the race to its final surface quality.
8. Duo-cone seals and the grease charge are fitted during assembly on a clean workbench.
9. Batch inspection covers hardness readings, crack detection and full dimension gauging.
10. Anti-rust oil is applied before the roller is placed into the export carton and pallet.

YT is the export brand of XIAMEN YINTAI MACHINERY CO., LTD., a Fujian-based undercarriage manufacturer established in 2011. The company operates with 50-100 staff and generates USD 10-20 million in annual sales, with 90-100 percent shipped to overseas markets. Its production base includes forging hammers, CNC turning centers, heat treatment furnaces and induction hardening machines, giving full control over quality and delivery time.

An ISO 9001:2015 quality system covers the workflow from steel entry to final packing, and third-party inspection by SGS or other agencies is welcomed before loading. The factory also supports OEM and ODM projects, so rollers can be supplied with customer-specific packaging, part marking and stocking programs for long-term cooperation.

• Demolition and urban excavation: Machines tearing out foundations and loading debris work on abrasive rubble; the sealed, hardened YT roller keeps running when dust would quickly destroy an unsealed part.
• Cost-effective OEM replacement: Owners of ageing DH220 machines can hold downtime to a minimum by fitting a forged YT roller that matches original hardness at a budget-friendly aftermarket price.
• Used machine export programs: Dealers who refurbish Daewoo excavators for resale can renew the complete upper roller set in one pass and advertise the machine with fresh undercarriage components.
• Simplified parts stocking: Because this roller serves both DH220 and DH300-5 cross-fit demand, workshops can carry a single YT reference instead of tying cash up in several slow-moving numbers.

This carrier roller is intended for Daewoo DH220 and DH300-5 excavators engaged in building foundation works, utility trenching, road widening, scrap handling and general site preparation. It also performs well on machines that spend part of the day traveling on paved roads or compacted haul roads between work areas, where the upper chain run sees the most movement. The part suits both standard and long-track undercarriage layouts when the frame rail spacing and roller dimensions match the YT reference values.

Q1: Which machines does this roller cover?

The main fitment is the Daewoo DH220, with the Daewoo DH300-5 listed as a cross fitment. Send the machine serial number or the dimensions of the old roller and YT will confirm suitability.

Q2: How does this aftermarket roller compare with the genuine part?

The roller is produced to match the original part in material grade, hardness, seal arrangement and overall dimensions, offering equivalent service behavior without the genuine-brand price premium.

Q3: Why is surface hardness so important for a top roller?

The race constantly slides under the track chain, so a soft surface wears quickly and lets the chain sag. Hardening to 50-55 HRC with a deep case keeps the diameter true for a long working life.

Q4: Can I order a single piece as a trial?

Yes, the minimum order quantity is one piece and sample orders are shipped promptly so you can test the fit and finish before placing a bulk order.

Q5: What delivery time and warranty do you offer?

Stocked sizes ship within 5-7 days and production orders leave in 20-30 days. The roller carries a 12-18 month warranty against material and workmanship defects.

After final inspection every roller is oiled, wrapped against moisture and secured on a steel pallet or an export wooden pallet, with individual cartons available for small orders. Packing lists, hardness test reports and dimensional inspection sheets accompany each shipment. YT invites customers to use SGS or any nominated third-party inspector for pre-shipment verification, and mixed-container loading with other undercarriage parts is arranged to reduce the buyer freight cost.

• 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.