Hitachi E70B Track Drive Sprocket Casting ZG40Mn Steel Excavator Sprocket Chain Sprocket Wheel

This E70B sprocket is a precision-engineered undercarriage component manufactured by YT, a specialized factory with more than 35 years of experience in excavator and bulldozer spare parts production. Designed as a direct replacement for the E70B undercarriage system, it is built from ZG40Mn Steel steel and finished with a controlled heat treatment that delivers a surface hardness of HRC 45-52. Every unit is produced on modern machining centers and vertical CNC lathes so that critical dimensions, run-out and tooth geometry stay within strict tolerances.

The component is intended for machine owners, repair workshops and spare parts distributors who need reliable aftermarket undercarriage parts that reduce downtime and lower the total cost of ownership. With a monthly supply capacity of 10,000 pieces, we support both small trial orders and long-term, container-level contracts.

• Through professional quench-tempering processes to guarantee excellent mechanical properties, high strength and superior wear resistance to avoid bending and breakage.
• Produced in advance machining center and vertical CNC turning machine for precision requirements.
• strict quality management ensures the effective and stable products.

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.

• Precision Tooth Geometry: Teeth are machined on vertical CNC lathes to interlock accurately with the track chain, minimizing uneven wear and reducing chain skipping.
• Hardened Wear Surface: Induction and quench-tempering processes reach a surface hardness of HRC 45-52, which resists abrasion and extends service life in abrasive ground conditions.
• High Strength Core: The ZG40Mn Steel steel body keeps a tough, shock-resistant core that absorbs impact loads from rock, debris and heavy grading work.
• Tight Dimensional Control: Run-out, pitch and mounting bore are verified against OEM specifications to guarantee a drop-in fit without on-site adjustment.
• Anti-Corrosion Finish: A protective coating and optional paint safeguard the metal surface during sea freight and long-term storage.
• Full Model Coverage: Available for a wide range of Komatsu, Caterpillar, Hitachi, Kobelco and Doosan undercarriage systems, including custom drawings.

Production follows a documented seven-stage route. Each sprocket starts from verified raw stock, is shaped by casting or forging, then rough- and finish-machined before receiving its hardening treatment. A final inspection gate checks hardness, dimensions and surface integrity before packing, so that every batch behaves predictably in the field.

1. Raw material inspection and verification of the steel chemistry
2. Modeling, pattern making and sand preparation for casting or billet cutting for forging
3. Casting or forging into a near-net shape, followed by controlled cooling
4. Normalizing and rough machining to remove scale and establish reference surfaces
5. Finish machining of teeth, bores, bolt holes and pitch on CNC lathes and machining centers
6. Induction hardening and quench-tempering to the specified surface hardness
7. Dimensional inspection, magnetic particle crack testing and surface treatment

Precision Inspection Services

YT is a dedicated manufacturer of excavator and bulldozer undercarriage parts with over 35 years of production experience. Our plant operates casting, forging, heat treatment and precision machining lines under one roof, supported by an in-house metallurgical laboratory and a trained quality team. We export to North America, Europe, the Middle East and Southeast Asia, and we regularly produce custom parts from OEM drawings and samples. Flexible payment terms, video technical support and 24-hour online service are standard for our partners.

We help customers match the right sprocket to their working conditions. For high-abrasion sites we recommend the hardened specification; for machines that work mainly on soft ground we can supply a standard plate to balance wear life with cost. Combine this part with our track chains, rollers, idlers and idler assemblies for a complete undercarriage rebuild from a single supplier.

• Undercarriage refurbishment programs for E70B contractors and rental fleets
• Spare parts distribution for dealers who serve multiple excavator and bulldozer brands
• Wear-part replacement for mining, quarry, forestry and construction equipment
• Custom batches matched to OEM samples for machines with discontinued factory parts

• Is this sprocket a direct replacement? Yes. It is produced to match the OEM mounting bore, pitch and tooth profile for the listed machine, so it installs without modification.
• What is the minimum order quantity? We accept trial orders from 1 piece, and the price becomes more competitive for container-level quantities.
• How long is the delivery time? Normally 7 to 30 days after order confirmation, depending on stock and quantity.
• Can you produce custom sprockets? Yes. Send us a drawing or a sample and our engineers will confirm material, hardness and dimensions before production.
• What payment terms do you accept? We accept T/T, L/C and other mutually agreed terms.

Parts are protected with anti-rust oil or coating, packed in strong wooden cases or pallets and secured for ocean freight. Neutral or customer-branded packing is available. We offer a warranty of 12 to 18 months against manufacturing defects and provide video technical support for installation. Delivery is normally 7 to 30 days after order confirmation, depending on quantity and stock.

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