maintenance-free service

基本解释

Maintenance-free design, long service life.
免维护设计，使用寿命长。
Easily installed - maintenance free- almost unlimited service life - simple - safe - reliable - efficient.
安装简便-免费维修-最佳的使用寿命-简单-安全-可靠-有效。
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The sealed spherical roller bearings are protected against both particle and moisture contamination, enabling them to offer effective performance over long, virtually maintenance-free service lives.
这个密封的球面滚子轴承的保护，以防止颗粒和水分的污染，使他们能够提供有效的长期业绩，几乎免维修服务的生命。