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PC220-7 Top Roller 22U-30-00021 - 50Mn Forged Steel Carrier Roller with HRC50-56 Hardness for Komatsu Excavator Undercarriage
| MOQ: | 1個 |
| 価格: | US$19-34 |
| 標準梱包: | 標準的な輸出梱包 |
| 配達期間: | 7-15日 |
| 支払方法: | T/T、L/C |
| 供給能力: | 10000個/月 |
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.
- One-piece forged blank for maximum structural integrity and impact resistance.
- Dual heat treatment:
- Quenching: Hardens shell surface for superior wear resistance (HRC50-56).
- Tempering: Relieves internal stress to prevent cracking under repeated shock loads.
- Precision CNC machining: Mounting surfaces and shaft holes held to ±0.01mm tolerance, matching OEM assembly standards.
- Reinforced floating seal: Blocks mud, dust, and water to prevent early oil leakage in harsh environments.
- Jack up the track to release tension and clear the ground.
- Remove bolts from old top roller; clean mounting surface of dirt and rust.
- Position new roller, align bolt holes precisely.
- Torque bolts to OEM specs; reset track tension.
- Run idle test; confirm no abnormal noise or vibration.
- Exact OEM fit for PC220-7; part number 22U-30-00021.
- High wear resistance (HRC50-56) for long shifts in quarries and mud.
- Strong anti-leak performance with heavy-duty floating seal.
- Reduced vibration stabilizes track and improves operator comfort.
- Lower maintenance cost — longer service life vs. cheap alternatives.
- Fast bolt-on installation saves downtime and labor.
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%.
