The Center pivot Jack System is used to replace tires and gearboxes on center pivot sprinklers. It includes a lift plate and gear box supporter. The lift plate captures the A frame tube, stabilizing the jack and preventing slippage of the jack. The gear box supporter is adjustable to hold the gear box during bolt removal and replacement.
The Center Pivot Jack System can also incorporate the Safe Jack Stabilizer (51M-SJS48/60) that decreases ground loading to 1/6th that of the jack alone and the stabilizing cables make it virtually impossible to tip over. Both parts together make this an awesome system.