Gear Products' aerial lift and truck crane rotators are totally integrated systems that incorporate a hardened steel worm and a true worm gear slew ring, As GPI bearings have a worm gear tooth form, there is full line contact over several teeth resulting in low backlash throughout their long service life. Installation of our rotator reduces your cost dramatically by eliminating the need for precision machining the mounting surfaces and center distance of the gearbox. The need to adjust the swing drive pinion backlash against a traditional rotation bearing is eliminated by the system backlash being set at the factory.