Calculating Torque Requirements

Selection should be based on the maximum torque required at the drive wheel or hose reel. For centre pivot irrigation, the requirement depends on tower count, sprinkler pipeline weight, terrain gradient and soil conditions. For hose reel irrigators, it depends on reel dimensions, the weight of the water-filled PE hose and retrieval speed. Apply an appropriate safety factor to the calculated torque to accommodate changes in soil moisture and mechanical resistance.

Reference Irrigation Gear Reducer Specifications

Parameter	Typical value
Gear ratio	20:1, 30:1, 40:1
Input speed	1740 rpm
Output speed	43–87 rpm
Efficiency	90%
Housing material	Precision die-cast aluminium
Sealing	Triple-seal design
Weight	Approx. 16 kg

Ratio and output speed reference: 20:1 corresponds to 87 rpm, 30:1 to 58 rpm, and 40:1 to 43 rpm.

Ingress Protection and Sealing

Outdoor irrigation equipment is exposed to rain, dust, mud, fertilisers and pesticides. The specified ingress protection rating (IP rating) and sealing arrangement directly affect service life. Seal failure can cause lubricant leakage and contaminant ingress, accelerating gear and bearing wear. Applications in coastal areas of the Middle East also require suitable corrosion protection.

Maintenance Intervals and Lubrication

Agricultural equipment often has limited maintenance windows. Long service intervals or maintenance-free designs can significantly reduce total operating costs. Lubricant selection and seal quality are key factors in determining service intervals. SANYOO irrigation products use precision die-cast aluminium housings and high-quality seals to help extend grease replacement intervals.

Irrigation Gear Reducer Selection Support

Send the drive type, required torque and speed, mounting arrangement and environmental conditions to SANYOO’s technical team for irrigation series selection advice. Visit www.sanyoogear.com for further product information.