Valley Gearboxes and Center Drives
The Strongest, Most Trusted Gearbox in the Industry
At Valley® Irrigation, our mission is to provide you with the most durable irrigation supplies in the industry. That's why Valley is the only center pivot company that produces its own gearboxes. The industry-leading Valley gearbox is life-tested and quality checked throughout the process to ensure we are constructing the most reliable and structurally sound gearbox available.
Valley Gearbox Features
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Superior design: Three times the life of competitive gearboxes, based on independent tests.
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Greater torque capacity: Bull gear delivers 20% higher torque capacity, based on independent tests.
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Built-to-last: Longer output shaft increases mud and crop clearance, reducing chance of seal damage.
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Minimizes bearing loads: Special offset rims position tire close to the gearbox to minimize bearing loads for longer life.
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Highest load rating: Input and output bearings are American made and case hardened, resulting in the industry's highest load rating.
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Handles extreme conditions: Gearbox housing made to handle high-stress areas and extreme operating conditions.
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Additional load capabilities: Bronze bull gear option provides additional load capabilities with hardened steel worm for extreme operating conditions or extended life under less-severe conditions.
Valley Gearbox Specifications
Large-capacity Rubber Diaphragm
Expands with heat and pressure to minimize water condensation.
Input and Output Bearings
Case hardened to provide the highest quality and highest load rating available in the industry.
Worm Gear
High-strength ductile iron provides significantly longer wear life than steel when combined with a cast iron bull gear.
Tooth Design
Industry exclusive 25° tooth angle provides 40% longer life and better reliability in tough conditions compared to normal 14 1/2° tooth designs.
Largest Bull Gear Neck and Keyway
Provides strength in critical load-bearing area.
Expansion Chamber
Cap made of corrosion-resistant cast aluminum; rubber diaphragm allows oil to expand and contract during operation. Vented cap prevents pressure buildup and prevents seals from leaking.
Threaded Endcap
Allows accurate bearing preload to increase bearing life.
 52:1 Gear Ratio
 Fully recessed tooth design keeps oil between engaged gears.
 Bull Gear
High-strength cast iron provides the highest load capacity and longest life in the industry. Optional bronze gear is available for extreme conditions.
Multi-viscosity Gearbox Oil
Exceeds 85w140 GL5 oil for long gear wear under extreme load conditions.
Valley Center Drive Features
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Added strength: Steel gears provide more strength than powdered metal
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Longer motor life: Aluminum finned housing runs 20° F cooler and there's no paint to chip, scratch or corrode
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Less corrosion: Internally vented junction box prevents moisture and contaminants from corroding the wire connections
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Extended performance: Crop guard protects shaft seals
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Improved reliability: Integral pinion gear eliminates coupler to improve reliability
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Quieter operation: Helical gears create more tooth contact than spur gears, delivering greater torque capacity and quieter operation
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Greater torque capacity: Special motor windings mean 40% higher operating torque than the competition
Valley Center Drive Specifications
25° Tooth Angles
Provide 40% greater load capacity and wear resistance than other manufacturers’ 14 1/2º tooth angles.
Built-in Crop Guard Over U-joint
Prevents crop wrapping in or near oil seals.
Double Reduction Gearing
Requires fewer gears, shafts, and bearings for greater reliability and efficiency.
Stator
Can be replaced independent of rotor, and is held in place with corrosion-resistant, stainless steel bolts for easy maintenance.
Valley-Exclusive Coating
Applied to internal surfaces to prevent corrosion.
Watertight Seal
Between housing components.
Finned Aluminum Housing
For cool-running efficiency. Operates at temperatures 20° F (11° C) lower than comparable motors with steel housing because the Valley aluminum housing and fins dissipate heat more effectively. This doubles insulation life and increases motor life.
Case-hardened Steel Helical Gears
More teeth meshed at all times for smoother power transmission.
Drain Plug
Easily accessible, extra large.