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Nautilus
Treadmill

Model # T618 Official Nautilus t618 treadmill

Here are the diagrams and repair parts for Official Nautilus T618 t618 treadmill, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 62 parts  |
Fr Roller 8009123
#NI

Main asy diagram

Fr roller

Part #8009123

The manufacturer no longer makes this part, and there's no substitute part

Drop Deck 8010049
#NI

Main asy diagram

Drop deck

Part #8010049

The manufacturer no longer makes this part, and there's no substitute part

Mcb Cover 8006404
#NI

Main asy diagram

Mcb cover

Part #8006404

The manufacturer no longer makes this part, and there's no substitute part

Adjustable Foot 8005139
#NI

Main asy diagram

Adjustable foot

Part #8005139

The manufacturer no longer makes this part, and there's no substitute part

Svc Kit-pr 8012986
#NI

Main asy diagram

Svc kit-pr

Part #8012986

The manufacturer no longer makes this part, and there's no substitute part

Shroud 8009263
#5F

Main asy diagram

Shroud

Part #8009263

The manufacturer no longer makes this part, and there's no substitute part

Cupholder 8009284
#16

Main asy diagram

Cupholder

Part #8009284

The manufacturer no longer makes this part, and there's no substitute part

Treadmill Wire Harness, Lower 8011992
#NI

Main asy diagram

Treadmill wire harness, lower

Part #8011992

The manufacturer no longer makes this part, and there's no substitute part

Shroud 8011998
#5H

Main asy diagram

Shroud

Part #8011998

The manufacturer no longer makes this part, and there's no substitute part

Rocker Switch 8004777
#NI

Main asy diagram

Rocker switch

Part #8004777

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

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Why won't my treadmill power up?

Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor co…

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Why is my treadmill's walking belt off center?

Main causes: rear roller out of alignment, damaged walking belt, bad roller…

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Why won't my treadmill start even though the console display works?

Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor…

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Why is my treadmill's heart rate sensor not accurate?

Main causes: faulty sensors, wiring failure, bad control console…

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Why does my treadmill have no display?

Main causes: bad control console, wiring failure, bad motor control board…

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Why does my treadmill's walking belt slow down?

Main causes: damaged walking belt, improper belt tension, lack of belt lubricant, bad drive motor…

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Why is my treadmill's walking belt slipping?

Main causes: damaged walking belt, improper belt tension, bad roller bearing…

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Repair guides for treadmills

These step-by-step repair guides will help you safely fix what’s broken on your treadmill.

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How to replace a treadmill motor controller

How to replace a treadmill motor controller

Your treadmill motor won't run with a defective motor controller. Replace the motor controller if it doesn't operate the…

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Repair difficulty
Time required
 15 minutes or less
How to replace a treadmill walking belt

How to replace a treadmill walking belt

A worn walking belt will begin to slow down during use. If your treadmill walking belt is worn out, replace it using the…

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Repair difficulty
Time required
 45 minutes or less
How to replace a treadmill drive motor

How to replace a treadmill drive motor

A defective drive motor won't run when activated by the motor controller. Replace the treadmill drive motor if it doesn'…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your fitness & exercise

Use the advice and tips in these articles and videos to get the most out of your treadmill.

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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