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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.
By Schematic
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Browse Parts for
T912 Fitness & Exercise
#20
Motor asy diagram
Nautilus treadmill motor control board
Part #SM41094
The manufacturer no longer makes this part, and there's no substitute part
#32
Covers assy diagram
Cover,mtr
Part #SM41108
The manufacturer no longer makes this part, and there's no substitute part
#21
Motor asy diagram
Motor controller-ac 230v
Part #SM41313
The manufacturer no longer makes this part, and there's no substitute part
#7
Motor asy diagram
Kit,flywheel
Part #SM26416
The manufacturer no longer makes this part, and there's no substitute part
#NI
Motor asy diagram
Kit,handrail asy
Part #SM41478-57
The manufacturer no longer makes this part, and there's no substitute part
#30
Motor asy diagram
Speed sensor kit
Part #SM26407
The manufacturer no longer makes this part, and there's no substitute part
#18
Motor asy diagram
Kit,elevation motor
Part #SM26418
The manufacturer no longer makes this part, and there's no substitute part
#96
Front 1 assy diagram
Hardware kit
Part #SM41315
The manufacturer no longer makes this part, and there's no substitute part
#3
Motor asy diagram
Screw 10-32x0.5
Part #SM41271
The manufacturer no longer makes this part, and there's no substitute part
#76
Roller assy diagram
Pwr input asy
Part #SM41589
The manufacturer no longer makes this part, and there's no substitute part
Symptoms for treadmills
Choose a symptom to see related treadmill repairs.
Main causes: damaged walking belt, improper belt tension, lack of belt lubricant, bad drive motor…
Main causes: damaged walking belt, improper belt tension, bad roller bearing…
Main causes: rear roller out of alignment, damaged walking belt, bad roller…
Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor…
Main causes: faulty sensors, wiring failure, bad control console…
Main causes: bad control console, wiring failure, bad motor control board…
Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor co…
Repair guides for treadmills
These step-by-step repair guides will help you safely fix what’s broken on your treadmill.
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…
Repair difficulty
Time required
15 minutes or less
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'…
Repair difficulty
Time required
15 minutes or less
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…
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.
Get answers to frequently asked questions about Sears and Sears PartsDirect.…