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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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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 62 parts  |
Rocker Switch 8004777
#NI

Main asy diagram

Rocker switch

Part #8004777

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

Hardware 8009265
#NI

Main asy diagram

Hardware

Part #8009265

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

Shroud-whe 8010340
#NI

Main asy diagram

Shroud-whe

Part #8010340

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

Cover-cons 8009296
#2

Main asy diagram

Cover-cons

Part #8009296

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

Shroud-whe 8010341
#NI

Main asy diagram

Shroud-whe

Part #8010341

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

Cover-junc 8009300
#NI

Main asy diagram

Cover-junc

Part #8009300

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

Cover 8009260
#NI

Main asy diagram

Cover

Part #8009260

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

Shroud 8011997
#5G

Main asy diagram

Shroud

Part #8011997

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

Upright Le 8009079
#9

Main asy diagram

Upright le

Part #8009079

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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