What is the purpose of a rain cap or cover on a rotary spreader?

• A. To reduce wind resistance
• B. To keep the hopper dry and protect openings from debris
• C. To change the rate of application
• D. To improve color of the hopper

Answer: (B)

The rain cap on a rotary spreader is all about protecting the product and how it flows. When fertilizer or seed sits in the hopper, moisture from rain can make it clump or form a crust, which disrupts smooth, even flow through the discharge openings. Debris like leaves or dirt can also get blown into the hopper or clog the openings, leading to uneven application. The cap acts as a weather shield, keeping the contents dry and shielding the openings from debris so the spreader delivers a consistent, uniform rate. It doesn’t change how fast the spreader applies product or affect the hopper’s color—its job is to preserve quality and consistency during outdoor use in wet or dusty conditions.