Tornado Adjustment Knob Spring K53322070

The Tornado adjustment knob spring (part# K53322070) is the helical spring that loads the brush height adjustment train. It is shared across two Tornado machines — the Tempest TV400-W26-U cordless wide-area sweeper and the BR 16/3 automatic scrubber, Model 99406 — so it is listed once here rather than duplicated under each machine.

The spring’s job is to take up the slack in the adjustment mechanism. Without a preload, the small clearances between knob, bushing, lever and twisting bolt would add up to free play, and the brush height would wander as the machine ran. The spring keeps the whole train pressed together in one direction so every knob position corresponds to a repeatable brush height.

Compatible Models for the Adjustment Knob Spring

• Tornado Tempest Wide-Area Cordless Carpet Vacuum Sweeper — Model TV400-W26-U
• Tornado BR 16/3 16″ Automatic Scrubber — Model 99406

Symptoms that point to the adjustment spring

• The brush height setting drifts while the machine is running.
• The adjustment feels loose or vague rather than positive.
• There is free play in the knob that was not there before.
• The spring is visibly collapsed, kinked or broken.
• New knob, bushing or bolt fitted and the adjustment is still vague.

Given the price, this is a part to renew on sight whenever the adjustment train is apart. It is the cheapest component in the assembly and the one most likely to be quietly responsible for a vague adjustment.

Fitting notes

Remove the battery pack before working on the Tempest. The spring sits in the adjustment train with the twisting bolt (part# K51053320), lever (part# K51297940) and nut (part# K73114210). It is under compression when assembled, so keep it captive as you work. The Tempest uses several springs of similar appearance — the battery latch and release springs are part# K63302640 and K63301600 and are not interchangeable with this one.

Twin City Vacuum has been selling and servicing Tornado equipment since 1956. Browse the full Tornado Tempest parts range, or see the Tornado Tempest TV400-W26-U machine. Manufacturer information is at tornadovac.com.

Frequently Asked Questions

What does the adjustment knob spring do?

It preloads the brush height adjustment train, taking up the clearances between knob, bushing, lever and bolt so each knob position gives a repeatable brush height instead of wandering as the machine runs.

How do I know if my adjustment knob spring needs replacing?

A height setting that drifts in use, an adjustment that feels vague rather than positive, or new free play in the knob. If a new knob, bushing or bolt did not sharpen the adjustment, the spring is the likely cause.

What models is the adjustment knob spring (part# K53322070) compatible with?

Two Tornado machines: the Tempest TV400-W26-U wide-area cordless carpet sweeper and the BR 16/3 16″ automatic scrubber, Model 99406.

Is this the same as the battery latch or release spring?

No. Those are part# K63302640 and part# K63301600, with different rates and lengths for different jobs. Order by part number — the springs look similar but are not interchangeable.

How do I order the adjustment knob spring (part# K53322070) or get help?

You can add the adjustment knob spring (part# K53322070) directly to your cart on this page, or call us at 763-535-0770. Our staff at 5415 West Broadway, Crystal, MN 55428 has been servicing Tornado equipment since 1956 and can help confirm the right part for your machine.

Questions? Call us at 763-535-0770 or visit us at 5415 West Broadway, Crystal, MN 55428.