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Manufacturer: Dyson
Model: Ball Animal 2
Model designation: UP20
Product: Upright vacuum cleaner
Problem: Excessive cleaner-head suction causing extreme resistance on carpet
Status: TESTED / PHYSICALLY VERIFIED
A Dyson Ball Animal 2 / UP20 with good airflow and suction can become extremely difficult to push on certain carpet because the cleaner head seals too tightly against the floor.
On the machine tested for this entry, slightly limiting the downward travel of the rear cleaner-head heel plate created a small controlled air gap and dramatically reduced the suction lock.
A simple zip tie was used as a spacer/stop.
Physical testing found:
The modification is reversible and requires no permanent alteration of the vacuum.
The machine may exhibit the following behavior:
The resistance can be severe enough to make an otherwise properly operating vacuum unpleasant or impractical to use.
The Dyson Ball Animal 2 used for this test had undergone substantial cleaning and refurbishment.
Work included:
The excessive resistance was therefore investigated as a cleaner-head sealing issue rather than simply assuming that restricted airflow or poor maintenance was responsible.
The cleaner head is designed to maintain close contact with the floor.
On some carpet, particularly when the vacuum is producing very strong suction, the cleaner head can seal tightly enough against the carpet that atmospheric air cannot easily enter around the head.
The result is a suction-lock effect.
Instead of merely removing dirt from the carpet, the cleaner head is pulled strongly against the carpet surface.
Reducing the quality of this seal slightly can substantially reduce the force required to move the vacuum.
A zip tie was installed as a physical stop/spacer around both of the upright silver tabs that are are located on the far ends of the soleplate mechanism of the cleaner head. The tabs are located on the back of the soleplate and face the ball mechanism.
The zip tie is applied above the top most plate of the soleplate around the silver tabs. There is a notch at the top of the tab that will retain the zip tie once it is applied around the tab and the excess is trimmed off.
The purpose of the zip tie is NOT to secure components together.
Instead, its thickness limits the amount the rear portion of the cleaner head can close toward the carpet.
This creates a very small additional air gap.
Because zip ties are available in different thicknesses, they provide a convenient and reversible method of experimenting with cleaner-head clearance.
A zip tie approximately 2.5 mm thick was tested.
Result:
This demonstrated that a relatively small change in cleaner-head clearance affects maneuverability without eliminating strong floor suction.
A substantially thicker zip tie, approximately 4.5 to 4.55 mm, was tested.
Result:
This established that increasing the rear clearance successfully addresses the excessive carpet-sealing problem.
However, this amount of clearance may be greater than necessary.
Based on the two physical tests, approximately 3 mm was identified as a likely compromise between the two configurations.
The goal is to use the smallest spacer that makes the vacuum comfortable to push.
A smaller gap preserves more cleaner-head suction.
A larger gap reduces suction lock but also allows more bypass air into the cleaner head.
Therefore:
Do not automatically use the thickest spacer that makes the vacuum easy to push.
Experiment with the minimum thickness necessary for the particular carpet and machine.
The approximately 3 mm figure should currently be considered PROBABLE, not VERIFIED, because that exact thickness was not part of the original completed physical test.
Vacuum cleaner suction depends on pressure differential and airflow.
When the cleaner head forms an extremely tight seal against carpet, pressure beneath the head drops substantially.
Atmospheric pressure then pushes the cleaner head toward the carpet, increasing the force required to move the vacuum.
Introducing a very small controlled air gap allows additional air to enter the cleaner head.
This reduces the pressure differential holding the head against the carpet while still maintaining useful airflow through the cleaning area.
A change of only a few millimeters can therefore make a surprisingly large difference in push effort.
This modification should only be considered after confirming that the vacuum is otherwise operating correctly.
Before modifying cleaner-head clearance, inspect for:
Do not permanently cut, drill, grind, or modify the cleaner head merely to experiment with this solution.
A removable spacer such as a zip tie allows the machine to be returned to its original configuration immediately.
Different carpet types may require different amounts of clearance.
Excessive suction-lock condition: PHYSICALLY OBSERVED
Zip-tie spacer concept: PHYSICALLY TESTED
Approximately 2.5 mm spacer: PHYSICALLY TESTED
Approximately 4.5–4.55 mm spacer: PHYSICALLY TESTED
Effect of increased clearance on push effort: PHYSICALLY VERIFIED
Approximately 3 mm optimum: PROBABLE / NOT YET PHYSICALLY VERIFIED
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Last updated: August 2026
This repair is part of the Obscure Product Knowledge Archive, a collection of firsthand repair results, tested fixes, physical measurements, parts information, compatibility findings, and hard-to-find technical information.