ZX210 Hitachi ZX240 Excavator Track Carrier Roller Forged 50Mn Steel Induction Hardened HRC 48-55 Undercarriage Part

The YT ZX210 track carrier roller is a replacement top roller for Hitachi ZX210 and ZX240 hydraulic excavators in the popular 20-ton operating class. Excavators swing, travel and dig under constant direction changes, so the upper track run needs firm support to avoid sagging and chain slap. This carrier roller mounts on the top of the track frame and keeps the chain aligned as the machine moves across stockpiles, demolition debris and soft ground.

YT builds the ZX210 roller from forged 50Mn steel with induction hardened treads reaching HRC 48-55. It is manufactured as a sealed assembly with shaft and bushings, dimensionally matched to the Hitachi track frame so that it replaces a worn roller without extra shimming or bracket work. The same roller family suits ZX210 and ZX240 variants, and the final fit is always double-checked against the customer's measurements before shipping.

Main Types of Carrier Rollers Key Features

• Forged one-piece body: closed-die forging of 50Mn steel removes weak points that cast rollers can show under impact.
• Hardened rolling tread: the contact surface is induction hardened to HRC 48-55 for long wear against the chain links.
• Impact-resistant core: tempering after quenching gives the roller a resilient center that handles excavator shock loads.
• Reliable sealing: grease-packed bushings with floating seals resist water ingress on wet job sites.
• Precision profile: CNC machining keeps the flange width and diameter within the ZX210 track specification.
• Easy installation: the assembly fits the standard carrier bracket and uses the original fasteners and pin layout.

Main Dimensions of Installation

Main Parameters

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.

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

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

Production Process

1. 50Mn steel bars are spectro-tested on arrival so the forging shop only accepts material with the correct chemistry.
2. Billets are heated and forged in closed dies to form the roller blank with a compact, continuous grain.
3. Normalizing and subsequent quench-temper cycles give the blank a consistent, machinable core.
4. CNC lathe operations produce the bore, tread and flange geometry according to the ZX210 drawing.
5. Induction hardening scans the tread area and is followed by a controlled quench to reach HRC 48-55.
6. Centerless and cylindrical grinding refine the outside diameter and surface finish.
7. The shaft, bushings and seals are assembled in a dust-controlled area with the correct grease fill.
8. Hardness, crack detection and dimensional checks are logged for every roller.
9. Rollers are rust-proofed and packed on pallets for export shipment.

Factory Strength

YT rollers come from XIAMEN YINTAI MACHINERY CO., LTD., a specialist undercarriage manufacturer and exporter operating since 2011. The ISO 9001:2015 certified plant houses forging hammers, CNC machine tools and induction hardening stations, giving the factory full command of quality for parts such as this ZX210 carrier roller. Small batch sizes are handled as carefully as large orders because every roller is measured and tested individually.

The company employs 50-100 staff and earns USD 10-20 million in annual sales, with exports accounting for 90-100% of turnover. YT has long experience supplying aftermarket undercarriage components to excavator owners, parts traders and rental companies, and third-party inspection by SGS or similar bodies is always welcome before goods leave the factory.

• Construction site wear: excavators working in demolition and aggregate handling get carrier rollers that resist gritty dust and impact debris.
• Component-level repair: instead of replacing the whole track frame, owners swap only the worn carrier roller with a YT assembly.
• Parts trader stocking: distributors can stock YT ZX210 rollers with confident turnover thanks to the large installed base of these Hitachi models.
• Rental fleet uptime: rental companies standardize on YT rollers to keep machines available and reduce mid-contract breakdowns.
• Mixed-model supply: YT can bundle carrier rollers with track shoes, links and idlers for the same excavator in one shipment.

Hitachi ZX210 and ZX240 excavators running YT carrier rollers are used across urban construction, roadworks, quarry loading, pipeline trenches and material recycling yards. On the upper chain run the roller prevents the track from drooping, which lowers wear on pins and bushings and keeps the machine stable while traveling. For contractors who rebuild undercarriages every season, the YT ZX210 carrier roller is a dependable component that pairs with the rest of the YT track range.

Compatible Brands Frequently Asked Questions

Q1: How can I be sure this roller suits my ZX210 or ZX240?

Compare the outer diameter, roller width, shaft bore and the fixing arrangement with your current part. Sharing a photo and the serial number area of the old roller helps YT confirm compatibility quickly.

Q2: Is this a genuine Hitachi part?

No, it is a YT aftermarket replacement produced to match the Hitachi specification. We supply an equivalent product without using the original brand, so always verify the OEM part number as well.

Q3: What makes HRC 48-55 the right hardness for this roller?

This hardness range resists abrasive wear from the chain while staying tough enough for the impact loads an excavator generates when tramming over rough ground.

Q4: Can I order a small quantity to test the fit?

Certainly. The minimum order is one piece and trial orders are common. For first-time buyers we also offer pre-shipment photos and measurement reports.

Q5: How long does delivery take and what warranty is included?

In-stock rollers ship in about 5-7 days; production batches need 20-30 days. The warranty period is 12-18 months against material and workmanship faults.

Each ZX210 carrier roller is coated with anti-rust oil, wrapped in protective film and packed on steel pallets or export wooden pallets with strapping to survive container handling. Before packing, rollers pass a final inspection covering hardness, geometry and seal assembly, and the results are filed by batch number for traceability. YT also provides OEM/ODM service, allowing customers to order rollers with their own packaging and part marking.

Why Choose Us?

• 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.