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Treadmill

Also called running deck.

A large high-voltage DC motor and the board that drives it from the mains. A known maker salvage for a lathe or a grinder, and a disappointing one if you wanted a 12 V motor.

A donor is the dead machine. The parts below are what is still worth removing from it. “Leave it” is a part that is physically in there and should stay in there: too dangerous, too worn, or only useful as part of a repair you are not doing.

What you are looking at

A scrapped machine is a box of parts that failed at different times. The reason it was thrown out is often one bad piece. The motor, the cord, the supply, and the screws are frequently still good. This index says which is which.

Why it is in the trash while the parts are not

A dead console, a worn belt, or it became a coat rack. The motor is usually the last thing to die.

Before you open it

Do this while it is still unplugged, cool, and not leaking. Unplug. The controller is mains. Read the motor nameplate before you disconnect anything, and write it down.

Where the dead machine usually is

Bulk trash day — Curb
Garage and shed — In the house
Move-out week — Curb

Bulk trash, and heavy. The motor alone is worth the trip; the deck is awkward.

How it comes apart

The motor cover. Photograph the wire colors on the controller. The incline motor is a separate, smaller machine.

Tools: Nut driver, Meter.

Words on this page

nameplate: The printed label on the part or the machine. If the label and this index disagree, use the label.
mains: Ordinary household wall power. It can kill. Unplug before you open anything that used it, and do not experiment on live wiring.

What to take

The table is the short version. The notes under it describe that part inside this machine, not only the general description.

Parts in this donor
Part	Call	How many	How often	Where to look
Brushed DC motor	Prize	1	always	The front roller.
Treadmill motor controller	Prize	1	usually	Under the motor cover.
DC gearmotor	Bonus	1	usually	Incline.
Timing belt	Bonus	1	always	The deck.
Panel switch	Bonus	1	usually	The safety key.
Axial fan	Bonus	1	sometimes	Controller cooling.

Prize

Prize — take this firstBrushed DC motor1 · always
Often 90–130 V DC, high current. The plate is the spec.
The front roller.
Unbolt. Do not assume 12 V.
Good.
Prize — take this firstTreadmill motor controller1 · usually
Mains in, variable DC out, matched to that motor.
Under the motor cover.
Keep the pot or the console connector.
Dead consoles are common. The power board may still run from a pot.

Bonus

Bonus, if you are already in thereDC gearmotor1 · usually
A smaller DC motor, often still high voltage. Read it.
Incline.
Do not mix it up with the main motor.
Good.
Bonus, if you are already in thereTiming belt1 · always
A wide walking belt, not a timing belt.
The deck.
Glazed belts slip.
Worn.
Bonus, if you are already in therePanel switch1 · usually
A magnetic key or a simple switch.
The safety key.
The magnet is part of the interlock.
Good.
Bonus, if you are already in thereAxial fan1 · sometimes
Mains or DC.
Controller cooling.
Read it.
Good.