The GQZ maintenance-free solution for kingpin applications (steering linkage) features a spherical plain bearing with a specially developed seal. The bearing requires no lubricant and is fully interchangeable with steel-on-steel plain bearings. we do this only for helping you to cut costs and environmental risks. For the end-user, cost savings can be considerable since relubrication downtime is eliminated. So is the risk of failure due to improper or lack of lubrication. No need to lubricate also means reduced environmental risks from grease leakages. Ultimately, the unit leads to higher reliability and improved productivity.