Hitachi Excavator Slewing Ring/ Swing Bearing for Hitachi Ex220-5 with High Quality

HITACHI  slewing ring swing bearing EX60-1/2/3/5 EX90 EX100-5 EX120-1/2/3/5 EX150 EX160WD-1 EX200-1/2/3/5 EX210-5 EX220-5 EX225U EX300-1/2/3/5 ZX120 ZX60USB-3F ZX200 ZX210 ZX225U ZX230 ZX240 ZX270 ZX 330 ZX350-5 ZX450H

Tongli Slewing ring swing bearing COMPANY is a specialized slewing bearing manufacturer, capable of designing, developing and manufacturing all types of slewing rings. With deep rooted company culture that 'professionism and commitment lead to successes', Tongli strives to offer customer satisfaction with superior technology, excellent product quality and superb service.
    Tongli has a manufacturing capacity of making 60,000 pieces of slewing rings each year, up to 4,000 mm in diameter for different structures. The products cover 2,000 different sizes and internal structures. With batches of products exported to Europe, America and Asia. Tongli Slewing Ring is a well known national brand foot-printing all over the world.

    Tongli slewing rings are widely used by OEMs in all types of excavators, mobile cranes, tower cranes, rail cranes, water treatment equipments, and machine tools etc.. The replacement slewing rings for different models of excavators, wind mills, solar system and mobile cranes provide the end users and distributors with more options. We believe that innovations create superior products, science enhances our brand. Tongli is a high-technology company, with a strong research and development capacity delivered by our own Institute of Slewing Ring Research. Four of the leading experts in the R&D were involved in drafting the national slewing ring standards (JB2300-78 and JJ36) since 1970s and 1980s, all having over 25 years of experience in slewing ring designing and manufacturing. The Institute has delivered numerous innovations and product improvements, generated a number of patents and other intellectual properties.

In 2010,Tongli devoloped his new patent"Elliptic Raceway Slewing Ring".After the slewing ring applied with elliptical raceway, its load capacity increases over 30%, and its service life doubled with the same diameter of the raceway and ball. And with the same load capacity, the diameter of the raceway can reduce 15%--30% (change by M/D/Fa), or the diameter of the ball can reduce 40%. As a result:
1.Under the same load capacity, it can save raw material over 20% and save procurement cost over 10%.
2.It has outstanding advantage in the occasion that the structure or the transport width is limited, such as automobile crane, pump truck, large-tonnage auto crane, and so on.
3.Especially, the single-row ball slewing ring with the same diameter which applied with elliptical raceway can substitute for the three-row roller slewing ring which diameter of the upper row roller is underΦ28; while the double-row eight point contact slewing ring which applied with elliptical raceway can substitute for the three-row roller slewing ring which diameter of the upper row roller is underΦ50.
It's widely used in XCMG, Fuwa, Hitachi ,Liugong, Zoomlion, Lishide,Carter, Jonyang,Rongan etc.

Advanced equipment,superb technics, perfect measuring,vigorous team sucessfully form our commitment to be a 'top-rank in China,well-known to World'brand.