Spread width tells you how far material travels width ways. Pass spacing tells you how far apart your walking or driving lines should be. Spread pattern tells you how material is distributed across the working area.

A broadcast spreader throws material outward and forward from the impeller in a fan-shaped pattern.

The useful spread pattern is not a perfect rectangle. It is not a clean V-shape. It is a 180-degree broadcast area in front of the spreader, with a heavier working centre and lighter feathered edges.

Those lighter edges are normal. Broadcast spreading relies on overlap. The edge of one pass is intended to overlap with the edge of the next pass.

For the result to look even, the pattern needs two things:

• the correct working width for pass spacing;
• a reasonably balanced left-right distribution across the 180-degree pattern.

These are connected, but they are not the same thing.

Do not try to correct every issue by opening the aperture. The aperture controls application rate. It is not the right tool for correcting a one-sided pattern or poor flow of material.

If the pattern is heavy to one side or intermittent, check these things before changing the rate setting:

• material quality;
• slider choice and positioning;
• Balance Transfer positioning;
• border control positioning.

Use this table to identify whether you are looking at a spread-pattern issue, a spread-width issue, or a material-flow issue.

These are starting points for diagnosis. Do not assume the first visible symptom is the only cause.

Granular materials do not all leave the impeller in the same way.

A heavier, larger, rounder particle generally leaves the impeller sooner and travels farther. A fine, light, powdery, flat, or irregular particle may stay on the impeller slightly longer before being thrown off.

On Cresco spreaders, the impeller rotates anti-clockwise. As a general rule:

• heavier or larger particles may leave the impeller earlier and can produce a pattern that is heavier on the right side;
• fine or lighter material may stay on the impeller longer and can produce a pattern that is heavier on the left side.

This is a rule of thumb, not a guarantee. Particle size alone does not dictate the pattern.

A large granule that is very light may behave more like a light, fine material. A small granule that is very dense may behave more like a heavier material. Shape, density, weight, surface texture, moisture, and particle consistency all matter.

Cresco spreaders are designed so commonly used fine turf micro and mini granular materials generally produce a balanced pattern without adjustment.

For most regular applications, the operator should not need to chase the pattern constantly. The goal is repeatable, practical uniformity, not laboratory perfection.

However, some materials sit outside the middle range. Very light, very heavy, unusually shaped, dusty, or mixed-size materials can shift the pattern left or right.

That is where spread-pattern adjustment becomes beneficial.

A one side dominant pattern can cause visible striping even if other parts of the work are correct.

For example:

• the calibrated application rate may be close;
• walking speed may be steady;
• pass spacing may be sensible;
• but one side of the pattern may still receive more material than the other.

When adjacent passes overlap, that imbalance can show as a stripe, band, or uneven colour response on turf.

This is why pattern balance should be checked separately from spread width and calibration.

Do not adjust the pattern until the basic causes have been checked.

First confirm:

• the material is dry and free-flowing;
• the material is not clumped, damp, dusty, or susceptible to bridging;
• the correct slider is fitted;
• the aperture opens and closes cleanly;
• the impeller area is clean;
• border control is not active unless you are intentionally spreading along an edge;
• walking speed is consistent;
• wind is not visibly moving the material.

Use the correct slider before judging spread pattern.

• Summer slider: fertiliser, seed, and all fine or uniform granular materials where controlled output matters most.
• Winter slider: salt, ice melt products, top dressing materials and other poor-flowing high-volume materials.

A wrong slider or slider setting can make a pattern unbalanced because material may intermittently flow, bridge, or overfeed, causing it to land inconsistently on the impeller.

If material is feeding inconsistently, fix the flow issue first. Pattern adjustment cannot correct poor flow.

Cresco spreaders use either the summer slider or Balance Transfer slider to help manage left-right spread pattern balance.

The principle is simple: material can be redirected towards or away from different positions on the impeller before it is thrown outward. Changing where material reaches the impeller changes where it leaves the impeller, which helps bring the pattern to balance.

Balance Transfer is not a substitute for calibration. It is a spread-pattern adjustment.

Use Balance Transfer to help centre the 180-degree pattern. Do not use it to:

• compensate for damp or poor-flowing material;
• replace pass-spacing checks;
• avoid calibration;
• correct wind drift.

On standard Cresco models, Balance Adjustment works through an adjustable paddle beneath the hopper on the main slider plate. The paddle partially closes or opens incrementally toward either the left or right flow holes before material reaches the impeller.

Adjusting one of the paddles changes how material is presented to the impeller. That can help correct a pattern that is heavier to the left or right.

However, because this type of adjustment changes the effective flow opening, it may also affect the application rate. After making a Summer slider Balance adjustment, re-check calibration before carrying out the application.

The paddle on the left side of the summer slider is responsible for reducing the material volume thrown to the right side of the pattern.

Adjusting the right side paddle reduces the width of the left side pattern.

The Cresco professional spreaders use the more advanced Balance Transfer adjustment.

This is controlled by rotating a wheel on the right-hand side of the spreader underneath the hopper. The control wheel has left and right settings from 1 to 4 .

• L1–L4 increasingly adjusts the spread pattern to the left.
• R1–R4 increasingly adjusts the spread pattern to the right.

The Cresco balance transfer system adjusts the relative delivery through the two outer holes above the impeller. As one outer opening is increased, the opposite outer opening is reduced by the same proportion.

This changes where material is delivered to the impeller and helps bring the pattern back into balance while maintaining the same total output volume through the three-hole system.

Use this adjustment only for spread-pattern balance. It does not correct poor material, replace calibration, or set pass spacing.

Note: As the Balance Transfer system does not change output volume, there is no need to recalibrate before proceeding.

Border control intentionally changes the spread pattern, stopping material spreading to the left side of the left wheel.

Use border control when spreading along an edge, path, kerb, boundary, planted area, or surface where material should not be thrown to one side.

If border control is active during normal spreading, the pattern is one-sided by design.

Use the actual material you plan to spread. A test with a different material does not prove the pattern for the material you will use.

Use a clean, dry hard surface where material can be seen and collected afterwards.

Sweep up all the material after testing, especially fertiliser, salt, or ice melt products.

Note: Do not test on grass areas as material can damage turf.

Tray testing provides an optimum view of pattern balance, especially for professional use, and operator training.

Place shallow trays across the expected spread area, leaving space for the wheels to pass through. Run a steady pass, then compare how much material lands in the left, centre, and right trays.

The goal is not equal material in every tray from a single pass. The goal is a balanced pattern that becomes even when adjacent passes overlap.

Balance Transfer is useful when the machine is clean, the material is flowing properly, and the pattern is still visibly heavier to one side.

• the pattern is visibly heavier on one side;
• you may be using a new fertiliser, seed, or granular material;
• the material is much lighter, heavier, or differently shaped than a standard mini granular fertiliser
• striping remains after speed, flow, and pass spacing have been checked;
• a tray or hard-surface check shows clear left-right imbalance.

• damp or clumped material;
• material bridging in the hopper;
• wind drift;
• rain-related build-up on the impeller;
• wrong slider selection;
• border control being active unintentionally;
• incorrect pass spacing;
• incorrect application rate;
• mechanical damage or obstruction.

Fix those issues first.

Some issues make the pattern wrong even when the product being applied is balanced correctly.

Damp, lumpy, dusty, or inconsistent material can cause intermittent flow and pattern variation. If material delivery to the impeller is uneven, the pattern will be unreliable.

Cresco calibration guidance is based on a steady walking speed of about 3 mph / 4.8–5 km/h. This is a brisk walking pace.

As a practical check, 10 metres should take about 7–8 seconds.

Lower or inconsistent speed can reduce spread width and change pattern behaviour. Speed changes during a pass can create visible striping.

Wind can push fine or light material sideways and make the pattern unbalanced.

Avoid spreading in rain. Wet material can stick to the impeller or build up around the flow area, reducing application accuracy and changing the pattern.

A rain cover can help in damp or drizzly conditions, but it does not make wet material suitable for accurate spreading.

Long, uneven grass, soft ground, slopes, or rough surfaces can make it harder to hold a steady pace.

Ground-driven spreaders rely on consistent wheel movement. If the spreader slows, slips, drags, or bounces, impeller speed and spread behaviour may change.

Spread pattern balance helps ensure the left and right sides of the broadcast pattern behave consistently.

Spread width and pass spacing still need to be checked separately.