Nan'an Zhongte Engineering Machinery Factory
| Keyword | Undercarriage Parts |
| Supply Ability | 10000PCS/Months |
| Warranty Time | 2000 Hour |
| Heat Treatment | Quenching And Tempering |
| Payment Terms | T/T,L/C |
| Operatingtemperaturerange | -20°C to 80°C |
| Delivery Time | 7-15Days |
| Machinery Test Report | Provided |
| Usage | Conveyor Systems |
| Certifiion | ISO\CE |
| Condition | 100% Brand-new |
| Production Method | Casting and Forging |
| Diameter | 50 mm |
| Packaging Details | Standard Export Packaging |
| Compatibility | Suitable for various excavator models |
| Wheel Body | 50Mn |
| Trademark | OEM |
| Brand Name | ZTMC |
| Model Number | PC220-7/PC240-7 |
| Place of Origin | CHINA |
| Certification | ISO9001 |
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Product Specification
| Keyword | Undercarriage Parts | Supply Ability | 10000PCS/Months |
| Warranty Time | 2000 Hour | Heat Treatment | Quenching And Tempering |
| Payment Terms | T/T,L/C | Operatingtemperaturerange | -20°C to 80°C |
| Delivery Time | 7-15Days | Machinery Test Report | Provided |
| Usage | Conveyor Systems | Certifiion | ISO\CE |
| Condition | 100% Brand-new | Production Method | Casting and Forging |
| Diameter | 50 mm | Packaging Details | Standard Export Packaging |
| Compatibility | Suitable for various excavator models | Wheel Body | 50Mn |
| Trademark | OEM | Brand Name | ZTMC |
| Model Number | PC220-7/PC240-7 | Place of Origin | CHINA |
| Certification | ISO9001 | ||
| High Light | PC220-7 Top Roller 22U-30-00021 ，50Mn Forged HRC50-56 Carrier Roller ，Komatsu Factory OEM Top Roller | ||
Heavy-duty PC220-7 top roller (carrier roller), direct OEM replacement for Komatsu PC220-7 excavator. OEM part number 22U-30-00021. 1:1 match to original mounting dimensions and bolt pattern — no cutting, drilling, or modification required. It supports track tension, reduces sagging and vibration, and minimizes undercarriage downtime for fleets operating in heavy-duty environments.
| Item | Specification |
|---|---|
| OEM Part Number | 22U-30-00021 |
| Compatible Model | Komatsu PC220-7 (also fits PC200-7 / PC240-7) |
| Material | High-strength 50Mn / 40Mn2 forged steel |
| Machining Tolerance | ±0.01mm CNC precision |
| Heat Treatment | Overall quenching + stress-relief tempering |
| Surface Hardness | HRC 50-56, depth 4-10mm |
| Seal Type | Heavy-duty floating seal (double-cone) |
| Weight | ~16.8kg (37lbs) |
| Color | Black / Yellow / Custom |
| Installation | Plug-and-play, bolt-on direct replacement |
| Warranty | 1 year / 2000 working hours |
PC220-7 excavators are widely used in quarrying, heavy earthmoving, road construction, and muddy job sites. The robust undercarriage handles high loads, but continuous gravel abrasion, water immersion, and high-impact steering cause standard aftermarket rollers to leak, seize, or crack quickly. This roller is engineered for heavy-load, long-hour operation in severe conditions.
A large construction fleet in Southeast Asia operates 15 units of PC220-7 in quarry and highway projects. Previously, generic top rollers failed at 800-1000 hours with frequent seal leaks. After switching to our OEM-spec rollers, units run 1,700+ hours without leakage or shell damage, cutting annual undercarriage maintenance cost by 32%.
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
2015
Total Annual:
5000000-8000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
Nanan Zhongte Construction Machinery Factory is located in Quanzhou, Fujian Province, China — a city recognized by UNESCO as the starting point of the ancient Maritime Silk Road and also a vibrant metropolis with an economic output exceeding one trillion yuan. As a large enterprise specializin... Nanan Zhongte Construction Machinery Factory is located in Quanzhou, Fujian Province, China — a city recognized by UNESCO as the starting point of the ancient Maritime Silk Road and also a vibrant metropolis with an economic output exceeding one trillion yuan. As a large enterprise specializin...
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