Variable Rate IrrigationT-L pivot systems are protected by comprehensive manufacturer's warranties. Planetary gearboxes are guaranteed for 8 years/24,000 hours, and worm gear drives are protected for 8 years/16,000 hours due to our hydraulic design and continuous movement performance. This warranty is unmatched in the irrigation industry and reflects T-L's confidence in the system's design and field performance. The Alignment Control Valve is warranted for eight years! Hydraulic motors are warranted for 4 years, 4000 hours!