Tornado Pushbutton Momentary Switch 10A 19121

A momentary switch is on only while it is held, which is what you want for a solution trigger: release it and the spray stops. Part number 19121 is the genuine OEM 10A momentary pushbutton for the Mini-Marathon, MWH-800 and Marathon 800 extractors. The 10A rating matters — a lower-rated switch in this position welds its contacts. It also fits the Tornado 98167 20″ Marathon 800 carpet extractor (8 Gallon, 230V).

Compatible Models for the Pushbutton Momentary Switch 10A

This part fits the following Tornado machines:

• Tornado 98164 MWH-800 8-Gallon Self-Contained Carpet Extractor
• Tornado 98166 20″ Marathon 800 Carpet Extractor (8 Gallon, 115V)
• Tornado 98168 12 Gallon Self Contained Carpet Extractor
• Tornado 98168 20″ Marathon 1200 Carpet Extractor (12 Gallon, 115V) — all series
• Tornado 98150 Mini-Marathon 425 Carpet Extractor
• Tornado 98150-ACE Carpet Extractor
• Tornado 98150LM Mini Marathon Lundmark Carpet Extractor
• Tornado 98150-PF Carpet Extractor
• Tornado 98169 20″ Marathon 1200 Carpet Extractor (12 Gallon, 230V)
• Tornado 98167 20″ Marathon 800 (8 Gallon, 230V)

Momentary switches fail in a specific and dangerous way: the contacts stick closed. The function stays on after the button is released, which on a solution trigger means the machine keeps spraying. Operators work round it by switching the machine off at the panel, which is a sign the switch should have been replaced weeks ago.

The other end of the same failure is a switch that has gone intermittent. It works when pressed hard and not when pressed lightly, or works cold and not warm. Both are contact erosion — the arc that happens every time the circuit breaks slowly burns the contact faces, and a switch approaching the end of its life does it unevenly.

What accelerates it is load. A 10A switch driving a pump that is working against a blocked strainer or scaled tips draws more current than it should every time it operates, and every operation costs a little more contact material than it should. If you are on your second switch in a year, look at what it is driving before fitting a third.

Water is the other cause. This switch sits where an operator’s wet hand reaches it many times an hour, and solution that has tracked down behind the panel corrodes the terminals. A switch that tests fine on the bench but fails in the machine usually has corroded spade terminals rather than a bad switch body.

Fit with the machine unplugged at the wall — this is a line-voltage circuit. Photograph the terminals before disconnecting, transfer the wires one at a time so they cannot be swapped, and check that each spade seats fully with a firm pull. Test the function by pressing and releasing several times before the machine goes back into service, and confirm it stops when released.

Browse every assembly for this machine on the Tornado 98168 Marathon 1200 parts hub, and see the manufacturer’s range at tornadovac.com.

Frequently Asked Questions

What Tornado machines does the momentary switch 19121 fit?

It is used on the Tornado 98150 Mini-Marathon 425, 98150-ACE, 98150-PF and 98150LM Mini Marathon Lundmark extractors, the 98164 MWH-800, the 98166 20″ Marathon 800, the 98168 12 Gallon Self Contained extractor and the 98168 20″ Marathon 1200 in all series. Call 763-535-0770 if your machine is not listed.

My machine keeps spraying after I let go of the button — what is that?

Stuck contacts. A momentary switch is meant to be on only while held, and contacts that have welded keep the circuit closed after release. If operators are working round it by switching off at the panel, the switch needed replacing some time ago.

Why did my switch fail so quickly?

Usually load or water. A 10A switch driving a pump working against a blocked strainer or scaled tips draws more current than it should on every operation and burns its contacts faster. Solution tracking down behind the panel corrodes the spade terminals, which is why a switch can test fine on the bench and still fail in the machine.

How do I order the Pushbutton Momentary Switch 10A (part# 19121) or get help?

You can add the Pushbutton Momentary Switch 10A (part# 19121) 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.