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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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Showing 10 of 122 parts  |
Cover,mtr SM41108
#32

Covers assy diagram

Cover,mtr

Part #SM41108

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

Nautilus Treadmill Motor Control Board SM41094
#20

Motor asy diagram

Nautilus treadmill motor control board

Part #SM41094

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

Hole Plug SM41615
#16

Motor asy diagram

Hole plug

Part #SM41615

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

Switch Plate Asy SM41607
#15

Motor asy diagram

Switch plate asy

Part #SM41607

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

Housing,ergo Bttm-l SM41098
#82

Console assy diagram

Housing,ergo bttm-l

Part #SM41098

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

Pwr Input Asy SM41589
#76

Roller assy diagram

Pwr input asy

Part #SM41589

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

Screw 3/8-16x5 SM41532
#98

Front 2 assy diagram

Screw 3/8-16x5

Part #SM41532

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

Nut 3/8-16 SM22077
Nut 3/8-16

Part #SM22077

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

Bed,slider SM41649
#56

Belt assy diagram

Bed,slider

Part #SM41649

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 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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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 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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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 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
How to replace a treadmill walking board

How to replace a treadmill walking board

A worn-out walking board creates friction with the walking belt and causes the belt to slow down during use. Replace the…

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Repair difficulty
Time required
 30 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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