When you think about what part of your center pivot endures the most wear and tear, the drive train is one of the first things that come to mind. The center drive and gearboxes bear long load hours and rough terrain day in and day out during the irrigation season. The secret to maintaining your machine and extending its life is to make sure these key components are of the highest quality.
Not all gearboxes are created equally. Here are some things to consider when shopping around:
Input and output bearings. Make sure your gearbox bearings are not only made with the highest-quality materials, but that they are also surface- or case-hardened. Tests have shown that surface- hardened bearings perform better and are less resistant to cracking than through-hardened bearings.
The worm gear. You want a design that has a wide-base tooth angle to prevent the gears from failing. Most gears fail at the root, not the tip, so it’s best to have the widest angle possible at the base. You also want a design that leaves some space between the gears to keep oil where it is needed, minimizing wear and tear from friction.
The diaphragm. Choose a gearbox with a large-capacity diaphragm that can expand with heat and pressure because it will minimize water condensation from being drawn into the part and maximize seal life.
25^ tooth angles – Provide greater load capacity and wear resistance than the competition
Expansion chamber – Cap made of noncorrosive cast aluminium
Ductile iron worm gear – Provides higher load capacity against cast iron versus a steel worm gear
Bull gear – Highest load capacity in the industry and longest life
Threaded endcap – Allows accurate bearing preload to increase bearing life
52:1 gear ratio – Full recessed tooth design keeps oil between engaged gears
Longest output shaft – This Ever-Power exclusive provides extra clearance between gearbox and tyre to reduce mud buildup, which in turn prevents seal damage and extends the gearbox life.