The Willmar S-500 offers the versatility to adapt to nearly any situation with up to 12 wheel track options. For driving the spinner system, you can choose one of two different PTO drives or the optional 8-horsepower engine, adding to the versatility of this spreader. The S-500 is available in single or dual spinner configurations.

The single spinner configuration has 65 foot total spread pattern width that uses a single-pass, flat-type pattern while the dual spinner model is available with 40- or 50-foot spinners to deliver an 80- or 100-foot spread using a 100-percent overlap, pyramid-style spread pattern.

Built to last, the conveyor and ground-drive chains are made with stainless steel while the frames are made of channel steel with reinforcements. The hopper and skid are constructed from 12-guard stainless steel. The S-500 is finished with a high-performance, chemical-resistant, epoxy-based, rust-inhibiting primer and a super-tough, acrylic urethane combination for corrosion-resistance to help protect and extend the life of these spreaders, while a corrosion-resistant phenolic flooring helps to facilitate smooth material flow without buildup from under the conveyor chain.

S-500 or S-500 NT Models

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Hopper Capacity – Struck
152 cu. ft.
Hopper Capacity – Heaped
167 cu. ft.
Weight Empty
2150 lbs.
Maximum Gross Weight
14,000 lbs.


Overall Length
181 in.
Overall Height
80 in.
Hopper Length
92 in.
Hopper Weight
96 in.
Hopper Height
45.25 in.


  • Dual axles, center-line wheel track; Axles built to 9000-lb. capacity, 4500-lb. hubs and 3 x 3 x 1/4 in. tubing; Multi-leaf springs on left and right side of each axle, 6 leaf springs; each leaf is 1.72 in. wide and .401 in. thick.


  • 6 x 2 x 1/8-in. rectangular tubing


  • 7-gauge, hot-rolled sheet, channel-formed


  • 12-guage, hot-rolled, milled steel channel-formed edges

Hopper, Skid & Gate

12-gauge, 409 stainless steel
12-gauge, 409 stainless steel
12-guage, 409 stainless steel


  • Phenolic Plastic

Conveyor Chain

  • 7 in. wide, 304 stainless steel with 1 in. x 1 in. mesh

Drive Chains

  • RC-2050, 304 stainless steel conveyor drive chain and RC-50, 304 stainless steel ground drive chain.

Conveyor Chain Engage/Disengage

  • Mechanically with rope control from driver’s seat.


  • 540 rpm PTO; 540/1000 rpm dual-drive PTO; ASM – 1000rpm, 1/75 in., 20-tooth PTO; Engine Drive – 8 hp Honda

Spread Pattern

  • Two 40-foot or 50-foot spinners deliver a total spread of 80 or 100 feet using 100% overlap, pyramid-type pattern; Single spinner has a 65-foot total spread width, using a single-pass, flat-type pattern.


  • 11L x 15.8-ply tubeless


  • 2-part, high-performance, chemical-resistant epoxy primer and a 2-part, modified high-gloss acrylic urethane paint


  • Rear turn signals, flashers and amber warning lights; meets ASAE S279 Standard

Other Features

  • 62- or 88-inch axles with 2- or 4-wheel brake options
  • Six narrow and two regular track width versions
  • Dependable ground drive, two-speed conveyer system
  • PTO-driven single- or dual spinners with four adjustable, curved blades on each
  • Application rate can be adjusted from less than 100 pounds per acre to more than one ton per acre

Track Widths

A narrow track version is available in six widths:

  • 62 inches (157 cm) with no brakes, or two- or four-wheel brakes
  • 64 inches (163 cm) with no brakes
  • 66 inches (168 cm) with no brakes
  • 68 inches (173 cm) with no brakes
  • 70 inches (178 cm) with no brakes
  • 72 inches (183 cm) with no brakes

Regular track widths are available in two widths:

  • 77 inches (196 cm) with no brakes, or two- or four-wheel brakes
  • 88 inches (224 cm) with no brakes