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Scag Split-Steel Pulleys

split-steel pulleyScag mowers feature split-steel pulleys for increased strength, reliability and reduced wear on pump and cutter deck drive systems. Split steel pulleys are lighter in weight and stronger than cast iron. They are also stronger than stamped pulleys.

As split-steel pulleys are made from a single piece of steel, no balance holes are required, unlike a cast pulley where they must be balanced and drilled. These drill points for balancing can create weak points.

The reduced weight (less rotational inertia) of the pulleys makes it easier for blades and other drive components to rotate up to speed. They also allow the electric clutch brake to stop the cutter blades faster with less wear on the clutch rotor and armature.

In short, the split-steel pulley design adds to the life of drive components, product reliability, and reduces maintenance time and cost.

Scag Split-Steel Pulley Benefits

  • Stronger than cast-iron pulleys
  • Stronger than stamped pulleys
  • Lighter-weight than cast-iron pulleys = less wear and tear on the drive systems
  • No extra balance holes required / pulley is balanced
  • Retains the use of taper-lock hub design for easy servicing
  • Black oxide coating for reduced corrosion
  • Scag uses split-steel pulleys on all drive applications (spindles, pumps, etc)

How a Split-Steel Pulley is Made

The split-steel pulley addresses the many problems that have plagued traditional pulleys for years. They are stronger than cast-iron or stamped/riveted pulleys, balanced, lighter weight to reduce drive wear and feature taper-lock hub design to make adjustments, removal and reinstallation a breeze.

Step 1: The Blank

Here a machine operator shows a blank (on left) and a blank that has gone through the splitting process (on right). As the pulley blank is a single flat piece of steel, its weight is evenly proportioned so it does not require balancing, unlike a cast pulley.

Scag Split Steel Pulley
Scag Split Steel Pulley

Step 2: Loading the Blank

The blank has been loaded into a machine that has a knife (on right) and a forming tool (on left side). Once locked into place, the blank will spin at very high RPM's while the knife and forming tool move inward, splitting the edge of the blank open, and forming the pulley "V" groove.

Scag Split Steel Pulley

Step 3: Splitting the Pulley

Once up to speed, the knife and roll forming tool move inward and split the edge of the blank open, forming the pulley "V" groove.

Scag Split Steel Pulley

Step 4: The Pulley is Formed

The machining center has released the blank which now has the proper belt groove created around the edge. This piece of the pulley is now finished and ready to be checked for proper tolerance.

Scag Split Steel Pulley

Step 5: The Pulley is Quality Checked

The machine operator verifies the piece is within tolerance. Next, it is off to have the center hub welded into place. After that, it will be coated with zinc phosphate for corrosion resistance.

Scag Split Steel Pulley