JDZG500R – ZGlide John Deere Z500R Series ZTrak Mower Suspension. The ZGlide suspension forks are American made and they are an innovative product that reduces front end bouncing and vibration. Your John Deere zero turn mower will operate smoother on rough ground and give you a better cut. ZGlide suspension forks are easy to install in less than an hour. The JDZG500R ZGlide suspension forks fit the following models.