DO Type 280-480mm Floating Seal

The DO Type 280-480mm Floating Seal is a precision-engineered component designed for use in crawler bulldozers and hydraulic excavators, with specific models matching part numbers FS2540 through FS4500. Each variant has defined inner and outer diameters, width, and mounting geometry to fit exact machine models. The seal is constructed with a hardened cast iron housing and a rubber O-ring that maintains contact under dynamic shaft movement, preventing contamination of bearings and gearboxes.

The housing material is high chrome alloy cast iron, hardened to HRC60-72 for abrasion resistance. The O-ring is available in NBR, VMQ, HNBR, or FPM, selected based on the operating environment’s temperature and fluid exposure. These materials are standard in heavy machinery seals and provide compatibility with hydraulic oils, grease, and dust-laden atmospheres. The floating mechanism allows for axial play, compensating for shaft misalignment without increasing friction.

This seal is used primarily on domestic Chinese bulldozers such as SHANTUI, XUANGONG, and ZOOMLION, as well as Komatsu and Caterpillar models up to D10H. It is also applied in loaders, pavers, and tunneling machines. Buyers include OEM parts distributors, maintenance depots for mining fleets, and construction equipment repair shops. Trade terms are not specified; packaging is inner box with outer carton. MOQ and lead time are not stated and must be confirmed with the supplier.

Beijing Zhongnuo Sealing Technology Co., Ltd. is listed as an imported supplier with harbor trust tier and no recorded response rate or average response time. The company’s address is in Beijing’s Dongcheng District, indicating a commercial or administrative office. The source does not confirm manufacturing capabilities, workforce size, certifications, or client references. The supplier appears to act as a commercial exporter, providing seals with specific part numbers tied to Chinese and international machinery models.

There is no indication that this entity designs, casts, or tests the seals in-house. The detailed part number list suggests sourcing or distribution of pre-manufactured components rather than original production. Buyers should request documentation confirming the origin of the seals and whether they meet OEM specifications for Komatsu or Caterpillar equipment. Without verification of production controls, quality consistency cannot be guaranteed.