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Nautilus
Treadmill

Model # T912 Official Nautilus treadmill

Here are the diagrams and repair parts for Official Nautilus T912 treadmill, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 122 parts  |
Treadmill Motor Control Board SM41094
#20

Motor asy diagram

Treadmill motor control board

Part #SM41094

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

Cover,mtr SM41108
#32

Covers assy diagram

Cover,mtr

Part #SM41108

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

Washer 10 Flat SM22637
#22

Motor asy diagram

Washer 10 flat

Part #SM22637

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

Cable Roc Keys Asy SM41193
#NI

Motor asy diagram

Cable roc keys asy

Part #SM41193

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

Hole Plug SM41616
#17

Motor asy diagram

Hole plug

Part #SM41616

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

Kit,elevation Motor SM26418
#18

Motor asy diagram

Kit,elevation motor

Part #SM26418

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

Screw 10-32x0.5 SM41271
#3

Motor asy diagram

Screw 10-32x0.5

Part #SM41271

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

Speed Sensor Kit SM26407
#30

Motor asy diagram

Speed sensor kit

Part #SM26407

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

Cover,mtr SM41099
#36

Covers assy diagram

Cover,mtr

Part #SM41099

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

Wheel Assembly Kit SM26402
#46

Frame assy diagram

Wheel assembly kit

Part #SM26402

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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